N,N-Disubstituted Aminoethanesulfonic Acid Catalyst for Taurine Synthesis
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Solution Overview
Problem
The existing ethylene oxide-based taurine synthesis process results in incomplete conversion of sodium isethionate to sodium taurinate, leading to the production of impurities like sodium ditaurinate and requiring high amounts of ammonia, which increases costs and reduces yield and purity.
Innovation Solution
A catalyst with a structure similar to sodium ditaurinate is added during the ammonolysis step, shifting the chemical equilibrium to increase the conversion rate of sodium isethionate to sodium taurinate, reducing impurity formation, and minimizing ammonia usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and high pressure environments are used to increase conversion rate, then the conversion of sodium isethionate to sodium taurinate improves, but the cost of preparation increases and the amount of ammonia used increases
Solution Approach 1:
The patent introduces a catalyst as an intermediary substance that mediates the ammonolysis reaction between sodium isethionate and ammonia. This catalyst lowers the activation energy barrier, enabling the reaction to proceed at higher conversion rates without requiring excessive increases in temperature or pressure, thus reducing ammonia consumption while maintaining productivity
Solution Approach 2:
The patent changes the chemical parameters of the reaction system by introducing a catalyst with specific molecular structure (containing amino group and sulfonic acid group). This parameter change enables the reaction to proceed more efficiently at moderate conditions, reducing the need for high temperature and pressure while increasing conversion rate and reducing ammonia usage
2Productivity
If high temperature and high pressure environments are used to increase conversion rate, then the conversion of sodium isethionate to sodium taurinate improves, but the yield and purity of taurine decreases due to impurity formation
Solution Approach 1:
The catalyst acts as a selective intermediary that promotes the desired ammonolysis reaction while suppressing side reactions that form impurities like sodium ditaurinate. By providing an alternative reaction pathway with lower activation energy, the catalyst increases selectivity for the target product, improving both yield and purity simultaneously
Solution Approach 2:
The patent converts the potentially harmful effect of high temperature and pressure (which causes impurity formation) into a beneficial catalytic process. The catalyst enables the reaction to proceed efficiently at milder conditions, transforming the problem of impurity formation into an opportunity for selective catalysis that improves product quality
3Ease of manufacture
If conventional ammonolysis process is used, then the production process is simple, but the yield of taurine is low and purity is reduced due to impurity formation
Solution Approach 1:
The catalyst serves as a simple intermediary substance that can be added to the existing ammonolysis process without fundamentally changing the reaction pathway or process complexity. The catalyst merely facilitates the reaction, maintaining process simplicity while dramatically improving yield and purity through enhanced reaction efficiency and selectivity
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 enhances the yield and purity of taurine to 98% or higher, reduces ammonia consumption, and simplifies the production process, making it suitable for industrial use while maintaining product quality.
Implementation Method 1
A catalyst with a structure similar to sodium ditaurinate is added during the ammonolysis step, shifting the chemical equilibrium to increase the conversion rate of sodium isethionate to sodium taurinate
Implementation Method 2
In the ammonolysis reaction, addition of this catalyst can significantly increase the yield of ammonolysis, inhibit the generation of impurities, and reduce the amount of ammonia used
Data Source
AI summary
Provided is a catalyst for preparing high-purity taurine, and the catalyst is N,N-disubstituted aminoethanesulfonic acid and has a structure represented by Formula I, in which R1 and R2 are each independently selected from alkyl, alkenyl, alkynyl, alkoxy, benzyl, sulfhydryl, thioether group, aryl, heteroaryl, amino, amide, imide, cyano, aldehyde group, carbonyl, carboxyl, sulfonic acid group, or ester group. Also provided is a method for preparing high-purity taurine, which adds the catalyst in an ammonolysis step for preparing taurine, thereby having effects of high yield, inhibition of impurity production and a reduced amount of ammonia used, etc. The catalyst has advantages of low cost, stable physical properties, and easy separation from the product. The preparation method is simple to operate with easily available raw materials and high yield, and can be employed for industrial production. Moreover, the purity of the prepared taurine can be up to 98% or higher.