Ionic Liquid Esterification Catalyst for Plasticizer Production
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Solution Overview
Problem
Current methods for producing carboxylic acid esters as plasticizers face challenges such as low space-time yields, formation of by-products, and complex work-up processes, particularly when using metal compounds like tetraalkyl titanates, which are costly and time-consuming.
Innovation Solution
A process involving the reaction of carboxylic acids and alcohols in the presence of an ionic liquid and methanesulfonic acid as a catalyst, where the alcohol acts as an entraining agent to remove water, allowing for high-temperature esterification with minimal by-product formation and enabling catalyst reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal compounds like tetraalkyl titanates are used as catalysts, then esterification can proceed, but the reaction time increases and space-time yield decreases
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by replacing traditional metal-based catalysts (tetraalkyl titanates) with a combination of ionic liquids and solid acid catalysts. This parameter change enables the reaction to proceed under milder conditions with shorter reaction times, directly improving space-time yield while reducing the loss of time.
2Ease of manufacture
If traditional esterification methods are used, then carboxylic acid esters can be produced, but by-products are formed requiring complex purification
Solution Approach 1:
The patent converts the traditionally harmful by-products of esterification into beneficial outcomes. By using ionic liquids and solid acid catalysts, the reaction selectively produces desired esters with minimal by-product formation. The ionic liquid medium helps suppress side reactions, and any water produced is easily removed through the alcohol's azeotropic distillation, effectively converting potential harmful by-products into manageable components that simplify purification.
3Manufacturing precision
If water removal is not efficient, then equilibrium limits conversion, but energy-intensive drying agents are required
Solution Approach 1:
The patent implements a self-service water removal mechanism where the alcohol reactant serves its dual function as both reactant and water-removing agent. Through azeotropic distillation, the alcohol automatically removes water from the reaction equilibrium without requiring external drying agents. This self-service approach maintains high conversion efficiency while minimizing additional energy input, as the water removal is coupled with the existing distillation process needed for product isolation.
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 method achieves high yields and selectivity in carboxylic acid esters with reduced reaction times, minimizing by-product formation and eliminating the need for complex purification steps, resulting in esters suitable for use as plasticizers with improved optical properties.
Implementation Method 1
reacting carboxylic acids and/or carboxylic anhydrides with at least one alcohol having at least 5 carbon atoms, selected from alkanols and cycloalkanols, in the presence of an ionic liquid and an acidic esterification catalyst
Implementation Method 2
the alcohol used is usually the energizing agent... The resulting water of reaction is distilled off as an alcohol-water azeotrope
Implementation Method 3
in the presence of an ionic liquid and an acidic esterification catalyst
Data Source
AI summary
The invention relates to a method for producing carboxylic acid esters by reacting carboxylic acids and/or carboxylic acid anhydrides with at least one alcohol having at least 5 carbon atoms, selected from alkanols and cycloalkanols, in the presence of an ionic liquid and an acidic esterification catalyst. The invention also relates to the use of the thus obtained carboxylic acid esters as a plasticizer or in a plasticizer composition for thermoplastic polymers and elastomers.