Continuous Ion Exchange for Multivalent Product Recovery
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Solution Overview
Problem
Current methods for recovering multivalent products from aqueous solutions, such as L-arginine, dicarboxylic acids, and diamines, face challenges in achieving high purity and concentration due to competition from monovalent by-products during ion exchange, leading to inefficient downstream processing and increased costs.
Innovation Solution
Implementing a continuous ion exchange process with a carousel system comprising multiple zones, including Adsorption, Monovalent Strip, and Elution Zones, utilizing ammonia/ammonium carbonate stripping to modify the valence of multivalent products and selectively desorb monovalent by-products, allowing for high purity and concentration recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ion exchange is performed at pH ~4 to recover monovalent multivalent products, then the recovery concentration is high, but the purity is reduced due to competition from monovalent by-products
Solution Approach 1:
The continuous ion exchange process is divided into multiple functional zones: a first ion exchange zone for adsorbing multivalent products at pH ~4 to achieve high concentration, and a second ion exchange zone for removing monovalent by-products to achieve high purity. This segmentation allows each zone to optimize for its specific function without compromise.
Solution Approach 2:
Different regions of the process have different pH conditions and resin types optimized for their specific function. The first zone operates at pH ~4 with resin optimized for multivalent product adsorption, while the second zone uses resin optimized for monovalent by-product removal. Each local region has quality parameters tailored to its specific role in the overall purification process.
2Manufacturing precision
If ion exchange is performed at pH ~1 to reject monovalent by-products, then the purity is high, but the concentration of the intermediate stream is reduced
Solution Approach 1:
The process separates the purity-enhancing function (operating at pH ~1 to reject monovalent by-products) from the concentration function (operating at pH ~4 to adsorb multivalent products). The first zone performs concentration at pH ~4, while the second zone performs purification by rejecting monovalent species, allowing each parameter to be optimized independently.
3Ease of operation
If batch mode ion exchange is used, then the process is simple to operate, but it cannot attain steady state operation and is impractical for large-scale industrial processes
Solution Approach 1:
The process uses continuous ion exchange with multiple columns operating in sequence, where adsorption, washing, and regeneration occur simultaneously in different zones. This continuous operation allows the system to reach steady state, maximizing productivity while maintaining the simplicity of ion exchange operation through automated multi-column cycling.
4Reliability
If multiple regeneration and washing phases are used in batch mode, then the binding capacity is optimized, but the process becomes complex and time-consuming
Solution Approach 1:
Regeneration and washing occur continuously in dedicated zones while adsorption occurs in other zones, eliminating the need for sequential batch operations. This parallel continuous operation maintains optimal binding capacity through consistent resin regeneration while simplifying the overall process control and reducing total processing time.
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 continuous ion exchange process effectively increases the purity and concentration of multivalent products, reducing recovery losses and lowering downstream processing costs by attaining steady-state operation and efficient adsorption and regeneration cycles.
Implementation Method 1
continuous ion exchange process with a carousel system comprising multiple zones, including Adsorption, Monovalent Strip, and Elution Zones
Implementation Method 2
principally adsorbing the multivalent product as the divalent specie in the Adsorption Zone
Implementation Method 3
utilizing ammonia/ammonium carbonate stripping to modify the valence of multivalent products and selectively desorb monovalent by-products
Implementation Method 4
Free ammonia and carbon dioxide are stripped from the eluate using a steam stripper
Data Source
AI summary
Described herein are processes and apparatus for the high purity and high concentration recovery of multivalent products via continuous ion exchange from aqueous solutions for further down-stream purification.