Mono Vinyl Ether Production via Transesterification Separation
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Solution Overview
Problem
Existing methods for producing vinyl ethers, such as the Reppe process, face challenges with high viscosity and gel formation at high conversions, leading to inefficient separation and residual products, requiring termination at lower conversions and complex distillation processes.
Innovation Solution
A process involving the reaction of a mono hydroxy compound with acetylene in the presence of a catalyst, followed by addition of an ester for transesterification, allowing for easy separation and purification of the mono vinyl ether through distillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the reaction is terminated at lower conversions of the alcohol, then the viscosity increases significantly and gel formation occurs, but the residence time is reduced and polymer formation is minimized
Solution Approach 1:
The harmful by-products (polymer and residual products) are removed by extraction using a suitable solvent, separating them from the desired vinyl ether product. This allows the reaction to be terminated at lower conversions without the harmful effects accumulating in the final product
Solution Approach 2:
The conversion level is optimized to a specific range (70-90%) where the balance between residence time and harmful by-product formation is achieved. This parameter change prevents excessive viscosity increase and gel formation while maintaining economical production time
2Productivity
If the reaction is terminated at lower conversions of the alcohol, then the residence time is reduced, but the separation of vinyl ether from unconverted alcohol becomes more difficult
Solution Approach 1:
A separating agent is introduced as an intermediary substance to facilitate the separation of vinyl ether from the reaction mixture. This agent enables efficient separation even when the conversion is at optimized levels (70-90%), solving the contradiction between productivity and ease of manufacture
Solution Approach 2:
The separating agent extracts the vinyl ether from the reaction mixture, allowing for easy separation from unconverted alcohol. This extraction process makes the separation step straightforward despite the optimized conversion level
3Ease of manufacture
If a two-step distillation process is used, then the vinyl ether can be separated from the mixture, but the process complexity increases due to azeotrope formation
Solution Approach 1:
A separating agent is used as an intermediary to simplify the separation process. This agent enables separation without requiring complex two-step distillation, reducing device complexity while maintaining separation capability
Solution Approach 2:
The complex mechanical distillation system is replaced with a chemical separation method using a separating agent. This substitution eliminates the need for multiple distillation columns and azeotrope handling, significantly reducing process complexity
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 process enables efficient and economic production of mono vinyl ethers with high yields, avoiding complex distillation procedures and achieving low unconverted alcohol levels.
Implementation Method 1
reacting a mono hydroxy compound of formula II R-OH wherein R has the above meaning with acetylene in presence of a catalyst to get a product mixture comprising the mono vinyl ether
Implementation Method 2
reacting the remaining mono hydroxy compound R -OH with the ester in the presence of the catalyst to get a transesterification product comprising at least one ester group of formula IV R-O 2 C- and an alcohol of formula V X-OH
Implementation Method 3
isolating the mono vinyl ether from the product mixture obtained after process step b), optionally followed by purification of the mono vinyl ether by distillation
Data Source
AI summary
A process to produce a mono vinylether of formula (I) R-O-CH=CH2 wherein R represents an organic group with at least three carbon atoms comprising a) reacting a mono hydroxy compound of formula (II) R-OH wherein R has the above meaning with acetylene in presence of a catalyst to get a product mixture comprising the mono vinyl ether, unconverted mono hydroxy compound and the catalyst b) adding an ester comprising at least one ester group of formula (III) X-O2 C- wherein X is a hydrocarbon group comprising less carbon atoms than R to the product mixture obtained in process step a) and reacting the remaining mono hydroxy compound R-OH with the ester in the presence of the catalyst to get a transesterification product comprising at least one ester group of formula (IV) R-O2C- and an alcohol of formula (V) X-OH wherein R and X have the above meaning and c) isolating the mono vinyl ether from the product mixture obtained after process step b), optionally followed by purification of the mono vinyl ether by distillation.