Continuous Chromatography for L-Cysteine Purification
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Solution Overview
Problem
Current methods for producing L-cysteine crystals involve chemical reactions, high water consumption, and additional purification steps, leading to lower yields and purities, as well as environmental concerns due to the use of large amounts of acidic and basic solvents.
Innovation Solution
A method utilizing continuous chromatography with a strongly acidic cation-exchange resin having sulfonic acid functional groups to separate and purify L-cysteine from a fermentation broth without chemical reactions, reducing water usage and enhancing productivity and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion-exchange chromatography is used to purify L-cysteine, then purity can be improved, but water consumption increases significantly due to large amounts of eluent required
Solution Approach 1:
The patent changes the pH parameter of the fermentation broth to within 3.0-9.0, which optimizes the ionization state of L-cysteine for effective binding to the strongly acidic cation-exchange resin. This parameter optimization enables high-purity separation with reduced eluent requirements, directly addressing the contradiction between purity and water consumption
Solution Approach 2:
The patent extracts L-cysteine from the fermentation broth using a strongly acidic cation-exchange resin that selectively binds the amino acid at optimized pH conditions. By taking out L-cysteine through specific ion-exchange binding followed by controlled elution, the method achieves high purity while minimizing the volume of eluent needed compared to conventional multi-step ion-exchange processes
2Manufacturing precision
If multiple ion-exchange steps are performed to achieve high purity, then manufacturing precision improves, but the process complexity and time increase
Solution Approach 1:
The patent merges multiple ion-exchange operations into a single integrated chromatographic step using a strongly acidic cation-exchange resin. By combining binding, washing, and elution operations in one continuous process at optimized pH 3.0-9.0, the method achieves high purity L-cysteine without requiring multiple separate ion-exchange steps, thereby reducing process complexity and equipment requirements
3Manufacturing precision
If conventional purification methods are used, then some level of purity can be achieved, but yield decreases due to losses in multiple processing steps
Solution Approach 1:
The patent implements a continuous ion-exchange chromatography process where L-cysteine is continuously bound to the strongly acidic resin, washed to remove impurities, and then continuously eluted with minimal dilution. This continuous operation maintains high L-cysteine concentration throughout the process, reducing losses and achieving both high purity and high yield compared to batch processing methods
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 recovery rates and purities of L-cysteine crystals, with a solid content of 80% or more, and reduces water consumption and energy costs, while maintaining the natural state of the product without chemical synthetic compounds.
Implementation Method 1
introducing a fermentation broth which has a pH range of 3.0 to 9.0 containing L-cysteine into a continuous chromatography apparatus having a strongly acidic cation-exchange resin as a stationary phase
Implementation Method 2
the strongly acidic cation-exchange resin in step (a) has a sulfonic acid functional group
Data Source
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AI summary
The present disclosure relates to a method for preparing L-cysteine crystals, and L-cysteine crystals prepared by the method. Through the method for preparing L-cysteine crystals of the present disclosure, L-cysteine crystals can be obtained from a natural L-cysteine fermentation broth with a high recovery rate and/or purity without a chemical reaction or the use of an artificial synthetic compound.