Distillation of dry goods 46 | | Case sharing - Catalytic distillation and hydrolysis of methyl acetate Distillation of dry goods 46 | | Case sharing - Catalytic distillation and hydrolysis of methyl acetate
Keywords Keywords
Methyl acetate; reactive distillation; hydrolysis; catalysis; process coupling; energy consumption optimization; industrial adaptation of methyl acetate; reactive distillation; hydrolysis; catalysis; process coupling; energy consumption optimization; industrial adaptation
Case Background Case Background
Polyvinyl alcohol (PVA) will produce a large amount of methyl acetate (MA) by-products in the production process. If an enterprise produces 33,000 tons of PVA per year, there will be 54,000 tons of MA output per year. For the utilization of MA, various PVA manufacturers currently use it to generate acetic acid and methanol through hydrolysis reaction as raw materials for the production of PVA. The traditional method of this hydrolysis process is to use a fixed bed hydrolysis process with cation exchange resin as a catalyst. The disadvantage is that the hydrolysis rate of MA is only 23% to 25%. A large amount of unhydrolyzed MA needs to be separated by rectification and then recycled for hydrolysis, resulting in huge equipment and high energy consumption. In this case, a new process of MA catalytic distillation hydrolysis is used to replace the old process of fixed bed hydrolysis, and industrial tests are carried out on the basis of the success of small-scale and pilot-scale studies to improve the hydrolysis rate, which can effectively solve the above technical problems. Polyvinyl alcohol (PVA) will produce a large number of methyl acetate (MA) by-products in the production process. If an enterprise produces 33,000 tons of PVA annually, 54,000 tons of MA will be produced every year. For the utilization of MA, at present, various PVA manufacturers use it to generate acetic acid and methanol through hydrolysis as raw materials for the production of PVA. The traditional method of this hydrolysis process is a fixed-bed hydrolysis process using cation exchange resin as a catalyst. The disadvantage is that the hydrolysis rate of MA is only 23% to 25%. A large amount of unhydrolyzed MA needs to be separated by rectifying and then recycled for hydrolysis, resulting in large equipment and high energy consumption. In this case, a new process of catalytic distillation hydrolysis of MA replaces the old process of fixed-bed hydrolysis. Industrial tests are carried out on the basis of the success of small-scale and pilot-scale studies to improve the hydrolysis rate, which can effectively solve the above technical problems.
Deep analysis of the core principles of catalytic distillation technology Deep analysis of the core principles of catalytic distillation technology
Catalytic distillation technology is a typical representative of chemical process strengthening, and the core is to realize catalytic distillation technology is a typical representative of chemical process strengthening. The core is to realize the spatiotemporal coupling synergy between reversible chemical reactions and distillation separation units. The spatiotemporal coupling synergy between reversible chemical reactions and distillation separation units completely breaks the dual limitations of thermodynamics and kinetics of traditional fixed bed processes. The hydrolysis of methyl acetate is a typical weakly equilibrium reversible reaction, and its equilibrium constant is extremely small. The conventional fixed bed reactor is a static reaction system. After the reaction reaches equilibrium, the components of the system do not change, and the one-way conversion rate is naturally limited by the equilibrium limit. This is also the essential reason why the hydrolysis rate of the traditional process is only 23% to 25%., completely breaking the dual limitations of thermodynamics and kinetics of the traditional fixed bed process. Methyl acetate hydrolysis is a typical weakly equilibrium reversible reaction, and its equilibrium constant is extremely small. The conventional fixed bed reactor is a static reaction system. After the reaction reaches equilibrium, the components of the system do not change. Constrained by the equilibrium limit, the one-way conversion rate naturally has an upper limit. This is also the essential reason why the hydrolysis rate of the traditional process is only 23% to 25%.Compared with the traditional step-by-step process of "reaction + post-separation", the catalytic distillation system constructs a dynamic non-equilibrium reaction environment: a continuous temperature layer, concentration layer and vapor-liquid mass transfer interface are formed along the height of the tower, and the acetic acid and methanol products generated by the hydrolysis reaction can be continuously and rapidly separated from the reaction section by rectification, breaking the reversible equilibrium of hydrolysis in real time, promoting the continuous shift of the chemical equilibrium to the positive reaction direction, and greatly improving the one-way hydrolysis conversion rate of methyl acetate from the thermodynamic source. At the same time, the reaction zone always maintains a high concentration of reactant system, effectively improving the probability of molecular collision, strengthening the reaction kinetic rate, and realizing the two-way positive cycle of "reaction enhancement-separation synergy". In addition, the process can utilize the trace reaction heat released by the hydrolysis reaction in situ to provide heat for the distillation mass transfer, realizing energy cascade utilization and avoiding the energy redundancy problem of the traditional process reaction heat release waste and the distillation heat consumption alone, which is also the core mechanism of its significant energy saving effect. Compared with the traditional step-by-step process of "reaction + post-separation", the catalytic distillation system constructs a dynamic non-equilibrium reaction environment: a continuous temperature layer, concentration layer and vapor-liquid mass transfer interface are formed along the height of the tower, and the acetic acid and methanol products generated by the hydrolysis reaction can be continuously and rapidly separated from the reaction section by rectification, breaking the reversible equilibrium of hydrolysis in real time, promoting the continuous shift of the chemical equilibrium to the positive reaction direction, and greatly improving the one-way hydrolysis conversion rate of methyl acetate from the thermodynamic source. At the same time, the reaction zone always maintains a high concentration of reactant system, effectively improving the probability of molecular collision, strengthening the reaction kinetic rate, and realizing the two-way forward cycle of "reaction enhancement-separation synergy". In addition, the process can utilize the trace reaction heat released by the hydrolysis reaction in situ to provide heat for the distillation mass transfer, achieving energy cascade utilization and avoiding the energy redundancy problem of the traditional process reaction heat release waste and the distillation heat consumption alone, which is also the core mechanism of its significant energy saving effect.
Traditional fixed bed process core shortboard traceability Traditional fixed bed process core shortboard traceability
The defects of the traditional cation exchange resin fixed bed hydrolysis process are not limited to low conversion rate, but the defects of the traditional cation exchange resin fixed bed hydrolysis process are not limited to low conversion rate, but there are reaction, mass transfer, energy consumption, equipment matching Systemic imbalance reaction, mass transfer, energy consumption, equipment matching Systemic imbalance . From the perspective of the reaction system, the fixed bed reactor is a fully mixed static system. During the reaction process, the products continue to accumulate and quickly approach the reversible reaction equilibrium. Even if the residence time is extended and the catalyst loading is increased, the upper limit of the equilibrium conversion rate cannot be broken. Unreacted methyl acetate accounts for more than 75%. From the perspective of the process flow, unhydrolyzed materials need to be equipped with multi-stage distillation towers, buffer storage tanks, and circulating pumps to form a huge circulation loop. There are many equipment sets, large footprint, and high investment in fixed assets... From the perspective of the reaction system, the fixed bed reactor is a fully mixed static system. During the reaction process, the products continue to accumulate, quickly approaching the reversible reaction equilibrium. Even if the residence time is extended and the catalyst loading amount is increased, the upper limit of the equilibrium conversion rate cannot be broken. Unreacted methyl acetate accounts for more than 75%. From the perspective of the process flow, unhydrolyzed materials need to be equipped with multi-stage distillation towers, buffer storage tanks, and circulating pumps to form a huge circulation loop. The number of equipment sets, large footprint, and high investment in fixed assets.
From the perspective of energy consumption and operation and maintenance, a large number of materials are recycled, heated, and condensed, resulting in ineffective losses of steam and power, and high energy consumption; at the same time, high cycle load causes fixed bed catalysts to be in a high flow rate and high load initialized state for a long time. Resin catalysts are easily broken, pulverized, and deactivated. High catalyst replacement frequency and large loss further push up production operation and maintenance costs. In addition, the residence time of traditional process materials is uneven, the vapor-liquid load in the tower fluctuates greatly, and local bias and trench flow are prone to occur, resulting in poor production stability, low operation elasticity, and difficulty in adapting to large-scale industrialized continuous production conditions. From the perspective of energy consumption and operation and maintenance, a large number of materials are cyclically rectified, heated, and condensed, resulting in ineffective losses of steam and power, and high energy consumption. At the same time, high cycle load causes fixed bed catalysts to be in a state of high flow rate and high load initialization for a long time. Resin catalysts are easily broken, pulverized, and deactivated. High frequency of catalyst replacement and large loss further push up production operation and maintenance costs. In addition, the traditional process materials have uneven residence time, large fluctuations in vapor-liquid loads in the tower, and local bias and ditch flow are prone to occur, resulting in poor production stability and low operation elasticity, making it difficult to adapt to large-scale industrialized continuous production conditions.
Technical solution details and process optimization logic Technical solution details and process optimization logic
Raw materials : Methyl acetate (approx. 8% water) and process water: Methyl acetate (approx. 8% water) and process water
Catalyst Catalyst : Cation Exchange Resin: Cation Exchange Resin
Industrial test equipment installation Industrial test equipment installation : Several sets of tower equipment, the catalyst filling method is shown in Figure 3. In addition, several sets of storage tanks, condensers, reboilers, pumps and meters matched with tower equipment.: Several sets of tower equipment, the catalyst filling method is shown in Figure 3. In addition, several sets of storage tanks, condensers, reboilers, pumps and meters matched with tower equipment.
Process flow Process flow : The raw material of hydrous methyl acetate and the process water are fed from the upper and lower sides of the catalytic distillation column according to the optimal ratio, and the temperature distribution and reaction rate layer in the column are accurately matched. The catalyst is regularly packed in the reaction section of the column, and simultaneously undertakes the dual functions of catalytic reaction and mass transfer packing. The upper section of the column is mainly separated by rectification, and the light product methanol is removed in time; the middle section is the core reaction zone, which maintains stable vapor-liquid contact and hydrolysis reaction; the lower section enriches the heavy product acetic acid and water. The light components at the top of the tower are partially refluxed after condensation to maintain stable operation in the tower. The mixed liquid of acetic acid, methanol and water is produced in the tower kettle. Subsequent separation can obtain qualified products. A small amount of unreacted trace materials is recycled without a large-scale loop circulation system.: The aqueous methyl acetate raw material and process water are fed from the upper and lower sides of the catalytic distillation column reaction section according to the optimal ratio, accurately matching the temperature distribution and reaction rate layer in the column. The catalyst is neatly loaded in the reaction section of the tower, and simultaneously undertakes the dual functions of catalytic reaction and mass transfer packing. The upper section of the tower is mainly separated by distillation to remove the light product methanol in time; the middle section is the core reaction zone to maintain stable vapor-liquid contact and hydrolysis reaction; the lower section enriches the heavy product acetic acid and water. The light components on the top of the tower are partially refluxed after condensation to maintain the stability of the operation in the tower. The tower produces a mixed liquid of acetic acid, methanol and water, and the qualified products can be obtained after simple separation. A small amount of unreacted trace materials is recycled, and a large-scale loop circulation system is not required.
The core optimization logic of this process lies in the accurate matching of working conditions and reaction characteristics. Accurate matching of working conditions and reaction characteristics : For the actual industrial working conditions where the raw material has trace moisture, no pre-dehydration pretreatment is required. The activity check point of the resin catalyst is optimized by using trace water. At the same time, through the regulation of the process water ratio, the thermodynamic requirements of the hydrolysis reaction and the distillation mass transfer load are accurately balanced to avoid the double drawbacks of high energy consumption of pure water feed and insufficient reaction of anhydrous feed. The regular catalyst loading mode abandons the drawbacks of traditional bulk fillers, and builds a uniform and unobstructed vapor-liquid mass transfer channel while ensuring sufficient catalytic activity check points to achieve reaction efficiency and mass transfer efficiency In view of the actual industrial conditions of raw materials with trace moisture, no pre-dehydration pretreatment is required, and trace water is used to optimize the activity check point of resin catalysts. At the same time, through the regulation of process water ratio, the thermodynamic requirements of hydrolysis reaction and the distillation mass transfer load are accurately balanced, so as to avoid the double drawbacks of high energy consumption of pure water feed and insufficient reaction of anhydrous feed. The regular catalyst filling mode abandons the drawbacks of traditional bulk fillers. While ensuring sufficient catalytic activity check points, a uniform and smooth vapor-liquid mass transfer channel is constructed to maximize the synergy between reaction efficiency and mass transfer efficiency.
In-depth quantitative analysis of project implementation results In-depth quantitative analysis of project implementation results
Using the above technical scheme and process flow, a laboratory test and an industrial test were carried out on the catalytic distillation hydrolysis of methyl acetate, among which the implementation results of the industrial test showed that using the above technical scheme and process flow, the catalytic distillation hydrolysis of methyl acetate was carried out. Laboratory test and industrial test, among which the implementation results of the industrial test showed conversion rate, energy consumption, operation and maintenance, production capacity four-dimensional comprehensive upgrade conversion rate, energy consumption, operation and maintenance, production capacity four-dimensional comprehensive upgrade significant advantages, quantitative benefits are highly industrialized value: significant advantages, quantitative benefits are highly industrialized value:
1. Steam consumption: The energy saving effect of the new process reaches 27.97%. Since the steam consumption of the methyl acetate hydrolysis process accounts for most of the energy consumption of the PVA production process, it can save 90,000 tons of steam per year based on the annual output of 23,000 tons of PVA. From the perspective of the essence of energy utilization, the energy saving core comes from three aspects: one is to save the repeated heating energy consumption of large-scale material circulation distillation; the other is to couple the heat of the reaction heat in situ to reduce the heat load of the reboiler; the third is to improve the mass transfer efficiency in the tower, the steam-liquid load is stable, the ineffective energy loss is greatly reduced, and the energy saving benefit can be directly converted into the production cost pressure drop of the enterprise. 1. Steam consumption: The energy saving effect of the new process reaches 27. Since the steam consumption in the hydrolysis process of methyl acetate accounts for most of the energy consumption in the production process of PVA, it can save 90,000 tons of steam per year based on the annual output of PVA 23,000 tons. From the perspective of energy utilization, the energy-saving core comes from three aspects: first, it saves the repeated heating energy consumption of large-scale material circulation distillation; second, the reaction heat is coupled in-situ distillation for heating to reduce the heat load of the reboiler; third, the mass transfer efficiency in the tower is improved, the vapor-liquid load is stable, and the ineffective energy loss is greatly reduced. The energy-saving benefits can be directly converted into the production cost pressure drop of the enterprise.
2. The new process has more than doubled the hydrolysis rate of methyl acetate, and the processing capacity of the reactive distillation column has been more than doubled. The hydrolysis rate has been increased from 23% to 25% to more than 60%, which has greatly reduced the material circulation rate and broken the bottleneck of traditional process production capacity. Double the processing capacity of a single tower means that under the same capacity demand, the number of tower equipment can be reduced, the floor area of the device can be reduced, the investment cost of fixed assets is significantly reduced, and the advantages of large-scale production of the device are highlighted. 2. The new process has more than doubled the hydrolysis rate of methyl acetate, and the processing capacity of the reactive distillation column has been more than doubled. The hydrolysis rate is increased from 23% to 25% to more than 60%, which greatly reduces the material recycling rate and breaks the bottleneck of traditional process capacity. Double the processing capacity of a single tower means that under the same capacity demand, the number of tower equipment can be reduced, the floor area of the device can be reduced, the investment cost of fixed assets is significantly reduced, and the advantages of large-scale production of the device are highlighted.
3. The new process can significantly reduce the amount of catalyst. Based on the annual output of 23,000 tons of PVA, 25 tons of ion exchange resin catalyst is required per year, while the new process only requires 5 tons. The core reason for the significant reduction in catalyst usage is that the regular loading mode avoids catalyst pulverization and loss, the working conditions in the tower are stable, and there is no local overload deactivation phenomenon. The catalyst activity and utilization rate are close to maximization; at the same time, the mild and stable reaction environment effectively delays the aging and deactivation of the resin, greatly prolongs the service life of the catalyst, and continuously reduces the production operation and maintenance cost from the consumable dimension. 3. The new process can significantly reduce the amount of catalyst. Based on the annual output of 23,000 tons of PVA, 25 tons of ion exchange resin catalyst is required per year, while the new process only requires 5 tons. The core reason for the significant reduction in catalyst dosage is that the regular loading mode avoids catalyst pulverization and loss, the working conditions in the tower are stable, there is no local overload deactivation phenomenon, and the catalyst activity utilization rate is close to maximization; at the same time, the mild and stable reaction environment effectively delays the aging and deactivation of the resin, greatly prolongs the service life of the catalyst, and continuously reduces the production operation and maintenance cost from the perspective of consumables.
Technical Highlights Underlying Advantages Analysis Technical Highlights Underlying Advantages Analysis
Thermodynamic breakthrough, one-way conversion rate leapfrog improvement Thermodynamic breakthrough, one-way conversion rate leapfrog improvement : Thoroughly break through the upper limit of the balance conversion rate of the traditional fixed bed, increase the one-way hydrolysis rate of methyl acetate from 23% to at least 60%, greatly reduce the amount of recycled materials, simplify the process flow, and solve the industry pain points of ineffective material cycle and equipment redundancy from the root.: Thoroughly break through the upper limit of the balance conversion rate of the traditional fixed bed, increase the one-way hydrolysis rate of methyl acetate from 23% to at least 60%, greatly reduce the amount of recycled materials, simplify the process flow, and solve the industry pain points of ineffective material cycle and equipment redundancy from the root.
Catalysis-mass transfer integrated coupling design Catalysis-mass transfer integrated coupling design : The exclusive catalyst loading structure has both catalytic function and mass transfer filler function, which not only ensures the full contact between the cation exchange resin and the reactants, accurately exerts the acid catalytic hydrolysis activity, but also builds a uniform and stable vapor-liquid contact interface to achieve the precise matching of the time and space between the reaction and mass transfer, and avoids the problems of reaction lag and mass transfer limitation.: The exclusive catalyst loading structure has both catalytic function and mass transfer filler function, which not only ensures the full contact between the cation exchange resin and the reactants, accurately exerts the acid catalytic hydrolysis activity, but also builds a uniform and stable vapor-liquid contact interface to achieve the precise matching of the time and space between the reaction and mass transfer, and avoids the problems of reaction lag and mass transfer limitation.
Excellent working condition stability, excellent long-term equipment life, excellent working condition stability, long-term equipment life : The gas and liquid distribution inside the catalytic distillation column is uniform, the tower pressure drop is small, and there is no local turbulence and deflection. The catalyst package is in a mild and stable working condition for a long time, which effectively avoids problems such as initialized damage, high temperature aging, and fouling inactivation. The service life can reach more than 4 years, which greatly reduces the frequency of equipment shutdown and replacement, and ensures the continuous and stable operation of the device.: The gas and liquid distribution inside the catalytic distillation column is uniform, the tower pressure drop is small, and there is no local turbulence and deflection. The catalyst package is in a mild and stable working condition for a long time, which effectively avoids problems such as initialized damage, high temperature aging, and fouling inactivation. The service life can reach The frequency of equipment shutdown and replacement ensures the continuous and stable operation of the device.
Strong system adaptability, double optimization of energy consumption and operation, strong system adaptability, double optimization of energy consumption and operation : High-efficiency tower internals optimize the hydrodynamic state in the tower, broaden the operation elasticity of the device, can adapt to small fluctuations in raw material moisture content, feed load, temperature and pressure, and have high industrial fault tolerance; at the same time, the dual blessing of energy cascade utilization and material efficient conversion realizes a significant reduction in system energy consumption and adapts to large-scale continuous production.: High-efficiency tower internals optimize the hydrodynamic state in the tower, broaden the operation elasticity of the device, and can adapt to small fluctuations in raw material moisture content, feed load, temperature and pressure, with high industrial fault tolerance; at the same time, the double blessing of energy cascade utilization and material efficient conversion, Achieve a significant reduction in system energy consumption and adapt to large-scale continuous production.
Modular design, high flexibility in engineering adaptation Modular design, high flexibility in engineering adaptation : Adopting customizable modular process design, the process configuration can be adjusted according to the production capacity scale, raw material working conditions, and product purity requirements of the enterprise. It can not only adapt to small and medium-sized fine production devices, but also match large-scale chemical integrated devices, and has a wide range of industrial adaptation scenarios.: Adopting customizable modular process design, the process configuration can be adjusted according to the production capacity scale, raw material working conditions, and product purity requirements of the enterprise. It can not only adapt to small and medium-sized fine production devices, but also match large-scale chemical integrated devices.
Industrialization Promotion Core Competitiveness and Industry Value Industrialization Promotion Core Competitiveness and Industry Value
This technology has achieved multi-scene and multi-enterprise large-scale implementation at home and abroad since 2006, successfully replacing traditional fixed bed technology and foreign imported high-end distillation technology. The core competitiveness lies in the fact that this technology has achieved multi-scene and multi-enterprise large-scale implementation at home and abroad since 2006. It has successfully replaced traditional fixed bed technology and foreign imported high-end distillation technology. The core competitiveness lies in high technical maturity, outstanding cost-performance ratio, adaptability to complex industrial conditions, significant comprehensive benefits. High technical maturity, outstanding cost-performance ratio, adaptability to complex industrial conditions, and significant comprehensive benefits , breaking the monopoly pattern of foreign reactive distillation technology., breaking the monopoly pattern of foreign reactive distillation technology.
In May 2006, TPT Petrochemical Company of Thailand undertook the MAH project with a treatment capacity of 4000t/a. The project was successfully started on December 12, 2006, and produced qualified acetic acid and first-grade methanol, marking the export of domestic catalytic distillation technology implementation and reaching the international advanced level of similar technologies.
In May 2006, TPT Petrochemical Company of Thailand undertook the MAH project with a treatment capacity of 4000t/a. The project was successfully started on December 12, 2006, and produced qualified acetic acid and first-grade methanol, marking the export of domestic catalytic distillation technology implementation and reaching the international advanced level of similar technologies. In 2007, this achievement was applied in the Fujian textile chemical fiber group company's annual output of 33,000 tons to 60,000 tons of polyvinyl alcohol production equipment. The hydrolysis rate of MA was increased from the original 23% to more than 60%, and the energy saving was more than 30% compared with the old process. It is perfectly adapted to the needs of device expansion and upgrading. Without adding a large number of equipment, the capacity can be doubled, the energy consumption pressure drop can be realized, and the transformation is very cost-effective. In 2007, this achievement was applied in the Fujian textile chemical fiber group company's annual output of 33,000 tons to 60,000 tons of polyvinyl alcohol production equipment. The hydrolysis rate of MA was increased from the original 23% to more than 60%, and the energy saving was more than 30% compared with the old process. Perfectly adapt to the needs of device expansion and upgrading. Without adding a large number of equipment, the capacity can be doubled, the energy consumption pressure drop can be achieved, and the transformation is very cost-effective.☺ In 2007, this achievement was applied in the polyvinyl alcohol catalytic distillation transformation project of Sinopec Group Shanghai Petrochemical Company. After comparing the achievement with the technology of Swiss Sulzer Company, it was decided to use the technical achievement in this case, and it was completed in early 2008 and entered normal operation. Compared with foreign technologies, this process has the significant advantages of low investment cost, simple operation and maintenance, adaptability to domestic chemical working conditions, and better energy saving effect, and realizes the localization of high-end chemical equipment technology. ☺ In 2007, this achievement was applied to the polyvinyl alcohol catalytic distillation transformation project of Sinopec Group Shanghai Petrochemical Company. After comparing the achievement with the technology of Swiss Sulzer Company, it was decided to use the technical achievement in this case. It was completed in early 2008 and entered normal operation. Compared with foreign technologies, this process has the significant advantages of low investment cost, simple operation and maintenance, adaptability to domestic chemical working conditions, and better energy-saving effect, and realizes the localization of high-end chemical equipment technology.
Technology Iteration Trends and Industry Expansion Prospects Technology Iteration Trends and Industry Expansion Prospects
From the perspective of the long-term development of by-product resource utilization in the PVA industry, the catalytic distillation hydrolysis process still has great iterative optimization space and scenario expansion potential. The current process has achieved core breakthroughs in conversion rate, energy consumption and stability. In the future, from the perspective of the long-term development of by-product resource utilization in the PVA industry, the catalytic distillation hydrolysis process still has great iterative optimization space and scenario expansion potential. The current process has achieved core breakthroughs in conversion rate, energy consumption and stability. In the future, it can be iteratively upgraded in the four directions of extreme energy efficiency, high-purity products, intelligent control, cross-scene adaptation extreme energy efficiency, high-purity products, intelligent control, and cross-scene adaptation . The first is to couple thermally coupled distillation and multi-stage waste heat recovery technology to further reduce distillation energy consumption and break through the existing energy-saving upper limit; the second is to optimize the modification of tower internals and catalysts, and develop high-stability, water-resistant, and anti-pollution special resin catalysts, which are suitable for industrial crude raw materials with high water content and impurities, and further improve the one-way hydrolysis rate to more than 80%; the third is to introduce an intelligent working condition control system, which adaptively adjusts the feed ratio and operating parameters based on real-time data of temperature, pressure, and components in the tower to improve the automation and fine operation level of the device. Four directions of iterative upgrade. The first is to couple thermally coupled distillation and multi-stage waste heat recovery technologies to further reduce distillation energy consumption and break through the existing energy-saving upper limit; the second is to optimize the modification of tower internals and catalysts, and develop high-stability, water-resistant, and anti-pollution special resin catalysts, which are suitable for industrial crude raw materials with high water content and impurities, and further improve the one-way hydrolysis rate to more than 80%; the third is to introduce an intelligent working condition control system, which adaptively adjusts the feed ratio and operating parameters based on the real-time data of temperature, pressure, and components in the tower to improve the automation and fine operation level of the device.
At the same time, the technology can break through the limitations of the PVA industry, expand to PTA production, acetate chemical by-products recycling and other scenarios, and solve the common problems of inefficient utilization and high energy consumption treatment of various methyl acetate by-products. Under the current policy guidance of green, low-carbon and resource recycling in the chemical industry, the catalytic distillation strengthening technology, as a typical energy-saving and consumption-reducing process, can effectively improve the utilization rate of methyl acetate resources, reduce the carbon emission and energy consumption intensity of chemical production, and have significant economic and environmental benefits. In the future, it will become the mainstream industrial technology for the resource utilization of ester by-products. At the same time, the technology can break through the limitations of the PVA industry, expand to PTA production, acetate chemical by-products recycling and other scenarios, and solve the common problems of inefficient utilization of various methyl acetate by-products and high energy consumption treatment in the industry. Under the current policy guidance of green, low-carbon and resource recycling in the chemical industry, the catalytic distillation strengthening technology, as a typical energy-saving and waste-saving process, can effectively improve the utilization rate of methyl acetate resources, reduce chemical production carbon emissions and energy consumption intensity, and has significant economic and environmental benefits. It will become the mainstream industrial technology for the resource utilization of ester by-products in the future.
| (Note: Parts of the document may be AI-generated) | (Note: Parts of the document may be AI-generated)
