Modular Valve System for SMB Chromatography
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Solution Overview
Problem
In Simulated Moving Bed (SMB) chromatography, the use of circulation pumps impairs separating capacity due to holdup volume, requiring additional compensations like asynchronous timing and flow adjustments, and pressure regulation is unstable, especially at high purity and short cycle times, limiting operational efficiency and flexibility.
Innovation Solution
A 4-pump concept replaces the traditional 5-pump system, using a constant flow eluent pump and control valves for outlet streams, eliminating the need for a circulation flow pump and incorporating a modular valve system with optimized dead volume management and robust mass flow regulation, allowing for efficient discharge of impurities and improved process control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circulation pump is used to guarantee liquid circulation in SMB, then circulation is ensured, but separating capacity is impaired due to holdup volume
Solution Approach 1:
The invention extracts and eliminates the circulation pump from the SMB system entirely. By using a valve circuit that automatically redirects mobile phase flow back to the previous adsorption bed outlet, the system achieves circulation without the holdup volume penalty of a pump, thereby resolving the contradiction between ensuring circulation and maintaining separating capacity.
2Productivity
If additional compensatory measures like asynchronous timing and flow adjustment are implemented to compensate for pump holdup volume, then separating capacity can be maintained, but device complexity increases
Solution Approach 1:
The invention removes the need for complex compensatory control measures by eliminating the circulation pump that causes the holdup volume problem in the first place. The valve circuit provides automatic flow redistribution without requiring asynchronous timing or flow adjustment mechanisms, thereby maintaining separating capacity while reducing device complexity.
3Ease of operation
If pressure regulation is used to control mass flows in SMB, then flow control is achieved, but stability becomes unstable especially at high purity and short cycle times
Solution Approach 1:
The invention replaces the pressure regulation mechanism with a valve circuit system that controls mass flows through mechanical valve positioning rather than pressure adjustment. This substitution provides more stable and predictable flow control, particularly under high purity and short cycle time conditions where pressure regulation becomes unstable.
4Ease of operation
If a 5-pump system is used for transporting fluids in SMB, then complete fluid transport control is achieved, but system complexity and operational inefficiency increase
Solution Approach 1:
The invention extracts and removes one pump from the traditional 5-pump SMB system. By eliminating the circulation pump and replacing it with a passive valve circuit, the system achieves the same fluid transport control with fewer active components, thereby reducing device complexity and operational inefficiency while maintaining complete fluid transport control.
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 configuration enhances separating capacity, reduces process instability, and increases operational efficiency by eliminating the need for compensatory measures, enabling more robust and flexible operation with improved throughput and product purity, particularly suitable for high-purity and short-cycle applications.
Implementation Method 1
Instead, a valve circuit is used which feeds back the mobile phase from the last adsorption bed outlet directly to the inlet of the first adsorption bed
Implementation Method 2
The invention relates to a chromatographic process for substance separation in the context of the preparation of chemicals such as, for example, chiral pharmaceuticals, isomers or biomolecules
Implementation Method 3
SMB is a process which allows continuous substance separations by imitating (simulating) the countercurrent between the adsorbent and mobile phase
Data Source
AI summary
The invention relates to a chromatographic process for substance separation in the context of the preparation of chemicals such as, for example, chiral pharmaceuticals, isomers or biomolecules on the small-scale and production scale, based on Simulated Moving Bed (SMB=countercurrent chromatography) technology.