Fixed Bed Membrane Reactor for Esterification Water Removal
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Solution Overview
Problem
Current processes for producing (meth)acrylic esters face challenges in effectively eliminating water to shift the reaction equilibrium and reduce energy costs associated with purification, while maintaining selectivity and productivity, due to complexities and inefficiencies in existing membrane separation technologies.
Innovation Solution
A process utilizing a fixed bed membrane reactor with a dehydration membrane module and a heterogeneous esterification catalyst, where the esterification reaction is conducted in an acid medium, allowing for continuous water removal and minimizing membrane fouling, employing pervaporation or vapour permeation to separate water from the reaction medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distillation and extraction methods are used to purify (meth)acrylic esters, then purification can be achieved, but the process becomes complex and energy-consuming
Solution Approach 1:
The patent employs reactive distillation which utilizes phase transitions between liquid and vapor phases to simultaneously conduct the esterification reaction and separate the ester product. The ester formed in the liquid phase is continuously vaporized and condensed, achieving purification while reducing energy consumption compared to conventional sequential distillation and extraction processes
Solution Approach 2:
The patent combines the reaction and purification steps into a single integrated reactive distillation process. The esterification reaction and the distillation separation occur simultaneously in the same apparatus, eliminating the need for separate purification units and reducing overall energy consumption while maintaining high purification quality
2Productivity
If water is not eliminated from the reaction mixture, then the reaction equilibrium cannot be shifted, but complex purification treatments are required
Solution Approach 1:
The reactive distillation process continuously removes water from the reaction mixture as it is formed, maintaining the reaction equilibrium shift throughout the entire process. The continuous vaporization and condensation cycles ensure constant water elimination without requiring complex batch-wise purification treatments
Solution Approach 2:
Water is eliminated through phase transition in the distillation process. The water formed in the liquid reaction phase is vaporized, separated in the vapor phase, and removed through condensation, achieving continuous water elimination that drives reaction equilibrium forward while simplifying the overall purification requirements
3Manufacturing precision
If membrane separation is used to dehydrate streams, then water elimination is effective, but membrane fouling occurs and productivity is reduced
Solution Approach 1:
The patent uses vapor-phase separation in distillation instead of liquid-phase membrane filtration. The phase transition from liquid to vapor eliminates the fouling problem associated with membranes, as the ester and alcohol remain in the liquid phase while water is removed through vaporization and condensation cycles
Solution Approach 2:
The patent replaces the mechanical membrane filtration system with a thermal distillation system. Instead of using membranes that are prone to fouling, the process uses heat-driven phase transitions to achieve water separation, eliminating the productivity reduction caused by membrane fouling while maintaining effective water elimination
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances productivity and selectivity, reduces equipment size and energy consumption, and simplifies the purification process by operating under stoichiometric conditions, achieving high conversion rates and minimizing residual reagents.
Implementation Method 1
employing pervaporation or vapour permeation to separate water from the reaction medium
Implementation Method 2
employing pervaporation or vapour permeation to separate water from the reaction medium
Implementation Method 3
in the presence of an esterification catalyst... employing a fixed bed membrane reactor in which the esterification reaction is conducted
Data Source
AI summary
The subject of the present invention is a process for the synthesis of C1-C10 alkyl (meth)acrylates, by direct esterification of the (meth)acrylic acid by the corresponding alcohol, the reaction being carried out in a fixed bed membrane reactor under conditions in which the water generated by the reaction is eliminated from the reaction mixture as it is formed. The process according to the invention may operate under conditions for which the reagents are not in excess, thereby minimizing the size and energy of the equipment for separation/recycling of the streams generated during the purification of the reaction medium.