Alpha-Hydroxycarboxylic Acid Distillation Below 140°C
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Solution Overview
Problem
Existing methods for producing α-hydroxycarboxylic acids result in low recovery rates and decreased purity due to impurities, particularly during crystallization processes, and distillation is ineffective due to polycondensation issues.
Innovation Solution
A method involving distillation of a mixed solution containing α-hydroxycarboxylic acid, water, and organic impurities under conditions with an upper limit temperature of 140°C or lower, effectively purifying the α-hydroxycarboxylic acid to a high yield and purity by preventing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is performed at high temperature to purify α-hydroxycarboxylic acid, then purification efficiency is improved, but polycondensation occurs causing loss of substance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the distillation temperature to remain below the polycondensation point of α-hydroxycarboxylic acid. By adjusting and maintaining the temperature within a specific range, the method achieves effective separation of impurities while preventing thermal decomposition and polycondensation reactions, thus resolving the contradiction between purification efficiency and substance loss.
2Productivity
If crystallization rate is increased to improve productivity, then production speed is improved, but purity decreases due to impurity incorporation
Solution Approach 1:
The patent replaces the crystallization process with a distillation process. Instead of relying on crystallization kinetics where faster growth leads to impurity incorporation, the invention uses distillation which separates components based on volatility differences. This substitution allows high productivity through efficient vapor-liquid equilibrium while maintaining high purity by selectively vaporizing the target compound away from non-volatile impurities.
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
The method achieves a high recovery rate of 99.5% or more and a purity of 99% or more of α-hydroxycarboxylic acid, maintaining stability and preventing side reactions.
Implementation Method 1
distilling a mixed solution containing an α-hydroxycarboxylic acid, water, and an organic impurity
Implementation Method 2
the distillation is performed under a condition that an upper limit temperature of a bottoms liquid is 140° C. or lower
Data Source
AI summary
A method for producing an α-hydroxycarboxylic acid composition includes distilling a mixed solution containing an α-hydroxycarboxylic acid, water, and an organic impurity, wherein the distillation is performed under a condition that an upper limit temperature of a bottoms liquid is 140° C. or lower.