Static Mixer for Transesterification Selectivity
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Solution Overview
Problem
Current industrial processes for manufacturing (meth)acrylic esters by transesterification face challenges in productivity due to secondary reactions producing impurities and the need for significant energy input for recycling fractions, despite efforts to improve raw materials balance.
Innovation Solution
The process involves using a static mixer with propellers or baffles to homogenize reagent and catalyst flows before introducing them into the reactor, ensuring uniform kinetics and reducing the formation of by-products, thereby improving selectivity and reducing reagent and catalyst usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reactants and catalyst are introduced directly into the reactor without pre-mixing, then the process is simpler, but the selectivity of the reaction decreases due to non-uniform catalyst distribution
Solution Approach 1:
The patent applies preliminary action by pre-mixing the catalyst with one of the reactants in a static mixer before introducing the mixture into the reactor. This ensures uniform catalyst distribution at the reaction zone, improving selectivity while avoiding complex in-reactor mixing systems.
Solution Approach 2:
The static mixer acts as an intermediary device that facilitates uniform mixing of catalyst and reactants before they enter the reactor. This intermediate mixing step resolves the contradiction by providing uniform distribution without requiring complex mixing mechanisms within the reactor itself.
2Productivity
If secondary reactions are allowed to occur during transesterification, then the reaction proceeds faster, but impurities increase and require additional purification steps
Solution Approach 1:
The patent applies parameter changes by optimizing the local concentration of catalyst through pre-mixing, which controls the reaction kinetics. This ensures that the reaction proceeds at an optimal rate while minimizing conditions that lead to secondary reactions and impurity formation.
3Loss of substance
If recycling fractions is implemented to improve raw materials balance, then material efficiency increases, but energy consumption increases significantly
Solution Approach 1:
The patent converts the potential harm of catalyst non-uniformity (which causes impurities) into a benefit by using pre-mixing to achieve uniform distribution. This reduces impurity formation, thereby reducing the need for energy-intensive recycling and purification operations.
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 the selectivity of the transesterification reaction, leading to increased productivity and reduced energy consumption in the manufacturing process, while minimizing the formation of heavy by-products and optimizing the use of raw materials.
Implementation Method 1
a static mixer which is a piping element comprising propellers or baffles or any other obstacle intended to increase turbulence
Implementation Method 2
the transesterification reaction between a light alkyl (meth)acrylate with a heavy alcohol in the presence of a catalyst
Data Source
Figure 1~2
Figure 3
AI summary
The subject of the invention is a process for continuously producing a (meth)acrylic ester by transesterification reaction between a light C1-C4 alkyl (meth)acrylate and a heavy alcohol in the presence of a catalyst, characterized in that the streams supplying the reactor are introduced by means of a static mixer placed on a recirculation loop of the reactor. The use of a static mixer makes it possible to improve the selectivity of the reaction and consequently the overall productivity of the process for synthesizing (meth)acrylic esters.