Parallel-Segment Simulated Moving Bed for Strongly Retained Compounds
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Solution Overview
Problem
Conventional simulated moving bed chromatography systems are limited by pressure drop considerations, which restrict throughput when separating mixtures with a strongly retained component, as high flow rates in one zone compromise pressure drops in other zones, especially in continuous operations.
Innovation Solution
Operating the SMB system in a parallel-stream manner, where columns are divided into two isolated groups with separate and simultaneous flow through each group, allowing a high flow rate through the second group without excessive pressure drops, using multifunctional ports governed by multi-way valves and rotation of port functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high flow rate is used in one zone to increase throughput, then productivity is improved, but pressure drop in other zones increases which limits further flow rate increases
Solution Approach 1:
The SMB system is divided into two independent parallel groups of columns (first group and second group), each capable of operating with independent flow rates. This segmentation allows Zone I to operate at high flow rates for high throughput while Zone II operates at lower flow rates to maintain acceptable pressure drops, resolving the contradiction between productivity and pressure constraints.
Solution Approach 2:
The invention transitions from a single-series SMB configuration to a parallel-stream configuration with two independent flow paths. This dimensional change in system architecture allows simultaneous operation at different flow rates in different zones, enabling high throughput in the extract zone while maintaining low pressure drops in the raffinate zone.
2Productivity
If continuous SMB operation is used to improve productivity, then productivity is improved, but pressure drop limitations restrict the flow rates that can be used
Solution Approach 1:
The continuous SMB system is segmented into two parallel independent streams, allowing each stream to be optimized for its specific function. The first group handles extract production at high flow rates while the second group handles raffinate production at lower flow rates, maintaining continuous operation without pressure drop limitations.
Solution Approach 2:
Different flow rate conditions are applied locally to different zones based on their specific requirements. Zone I (extract zone) operates at high flow rates to maximize extract recovery, while Zone II (raffinate zone) operates at lower flow rates to maintain acceptable pressure drops, with each zone optimized for its local function.
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 enables high flow rates for eluent through the most purified component's zone without limiting flow rates in other zones, maintaining low pressure drops across the system, thereby enhancing throughput and efficiency in separating mixtures with strongly retained components.
Implementation Method 1
the retention factor k′ is also the slope of the curve of the concentration of a solute adsorbed on in the stationary phase vs. its concentration in the mobile phase
Data Source
AI summary
Simulated moving bed (SMB) chromatography involving a series of columns serially connected in a circuit is performed in a modified protocol by dividing the columns into two groups isolated from flow communication with each other and using one of the two groups solely for extraction of the more strongly retained component from the solid phase while the other group is operated in the conventional SMB manner. The sites of introduction and withdrawal and the site of division between the two groups of columns are all rotated around the circuit as in conventional SMB chromatography, but the process is capable of separating component mixtures with non-linear isotherms and of extracting solutes that are very strongly retained on the solid phase.