Polyaspartic Acid Reflux Cooling Process
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Solution Overview
Problem
The production of polyaspartic acid via thermal polycondensation with acidic catalysts like phosphoric acid or methanesulfonic acid often results in highly viscous condensation phases that caking occurs, leading to process interruptions and laborious product purification, especially when using small amounts of catalyst.
Innovation Solution
A process involving reflux cooling without distilling water, achieving a degree of conversion of aspartic acid between 1% to 10%, followed by polycondensation with simultaneous water distillation, and subsequent hydrolysis with a base to produce polyaspartic acid, allowing for continuous operation and reduced catalyst usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If small amounts of acidic catalyst (1 to 25 mol%) are used in polycondensation, then catalyst recovery cost is reduced, but highly viscous to very hard condensation phases prone to clumping occur that cannot be stirred or kneaded
Solution Approach 1:
The patent applies preliminary action by conducting a pre-condensation step at lower temperature (100-220°C) before the main polycondensation. This preliminary treatment prevents the formation of hard, clumping condensation phases during the subsequent high-temperature polycondensation, maintaining stirrability and kneadability throughout the process while using only 1-25 mol% catalyst.
2Stability of the object's composition
If phosphoric acid is used as both catalyst and solvent, then polycondensation is well-controlled, but product purification becomes complex requiring washing and acid recovery
Solution Approach 1:
The patent segments the use of phosphoric acid into two distinct stages: first as catalyst/solvent during pre-condensation, then as catalyst only during polycondensation. The pre-condensation phase uses phosphoric acid to control the reaction, while the subsequent polycondensation phase eliminates the need for extensive purification by using the acid solely as a catalyst that can be easily removed.
3Ease of operation
If condensation is interrupted to break up clumped solid polycondensate, then mixing ability is restored, but productivity decreases due to process interruptions
Solution Approach 1:
The patent performs preliminary action by conducting pre-condensation at lower temperature before main polycondensation, which prevents the formation of clumped, non-stirrable solid polycondensate. This eliminates the need to interrupt the process for breaking up clumps, allowing continuous operation and maintaining high productivity throughout the polycondensation.
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 prevents caking issues, enables continuous polycondensation, and facilitates easier product recovery, improving process efficiency and reducing labor in catalyst recovery, while producing polyaspartic acid suitable for applications in cleaning and detergent compositions.
Implementation Method 1
Heating the mixture according to (a) under reflux without distillation of water at a reaction temperature of 100 to 220°C
Implementation Method 2
Polycondensation of the reaction mass according to (b) with simultaneous distillation off water at 170 to 250°C
Implementation Method 3
Hydrolysis of the polycondensates according to (c) with the addition of a base
Data Source
AI summary
The invention relates to a method for producing polyaspartic acid under reflux cooling, compositions containing polyaspartic acid obtained by said method, and the use of polyaspartic acids obtained by said method in rinsing agents, washing agents, and cleaning agents.