Antimony Catalyst Esterification for Ethyl Lactate Production
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Solution Overview
Problem
Current methods for producing ethyl lactate using solid acid catalysts face issues such as high cost, poor stability, and inefficient reaction rates.
Innovation Solution
The method involves subjecting lactic acid and ethanol to an esterification reaction in the presence of an antimony catalyst, specifically antimony trioxide, antimony pentoxide, or antimony trichloride, at a temperature of 80° C. to 88° C. and 1 atm pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If solid acid catalysts (Amberlyst 15, ZrO2-SiO2, WO3-SiO2) are used to increase esterification reaction rate, then reaction rate improves, but cost increases and stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst from conventional solid acid catalysts (Amberlyst 15, ZrO2-SiO2, WO3-SiO2) to antimony-based catalysts (Sb2O3, Sb2O5, SbCl3). This parameter change resolves the contradiction by providing a catalyst that is both cost-effective and stable while maintaining high catalytic activity for the esterification reaction between lactic acid and ethanol.
2Speed
If solid acid catalysts are used to accelerate esterification reaction, then reaction rate improves, but manufacturing cost increases
Solution Approach 1:
The patent employs antimony-based catalysts (Sb2O3, Sb2O5, SbCl3) that are significantly cheaper than conventional solid acid catalysts like Amberlyst 15. These antimony catalysts provide cost-effective catalysis for the esterification reaction, resolving the contradiction between reaction rate acceleration and manufacturing cost.
3Power
If conventional solid acid catalysts are used for ethyl lactate production, then catalytic activity is achieved, but thermal stability is poor
Solution Approach 1:
The patent changes the catalyst material parameter from conventional solid acid catalysts to antimony-based compounds (Sb2O3, Sb2O5, SbCl3). This parameter change simultaneously improves thermal stability while maintaining catalytic activity for the esterification reaction, resolving the contradiction between catalytic power and thermal stability.
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 results in a more efficient production of ethyl lactate with improved catalytic effects, cost-effectiveness, and thermal stability compared to traditional methods.
Implementation Method 1
subjecting lactic acid and ethanol to an esterification reaction in the presence of an antimony catalyst, so as to obtain ethyl lactate
Data Source
AI summary
A method for producing ethyl lactate includes subjecting lactic acid and ethanol to an esterification reaction in the presence of an antimony catalyst, so as to obtain ethyl lactate. The antimony catalyst is selected from the group consisting of antimony trioxide, antimony pentoxide, antimony trichloride, and combinations thereof, and the esterification reaction is carried out at a temperature ranging from 80° C. to 88° C. and under a pressure of 1 atm.