Simulated Moving Bed Bypass Flow Control
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Solution Overview
Problem
Simulated moving bed separation processes face challenges in minimizing pollution and recirculation-induced disturbances due to fluid composition discontinuities and dead zones in the fluid supply and withdrawal circuits, which affect the purity and yield of solute extraction.
Innovation Solution
The process involves controlling the flow rates in external diversion lines to ensure a majority of the fluid is injected or withdrawn from a chosen plate, with a minority fraction going to the adjacent plate, maintaining synchronicity and rinsing rates to prevent pollution and recirculation, thereby optimizing the operation of simulated moving bed separation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid supply and withdrawal points are shifted over time in simulated moving bed separation, then separation efficiency is improved, but dead zones form in the fluid circuits causing pollution and recirculation
Solution Approach 1:
The invention extracts the harmful stagnant fluid from dead zones by introducing bypass lines that continuously divert and remove fluid from these areas, preventing pollution accumulation and recirculation while maintaining the time-shifting operation mode for efficient separation
2Object-generated harmful factors
If bypass lines are used to sweep dead zones, then pollution is reduced, but fluid composition discontinuities cause recirculation disturbances
Solution Approach 1:
The invention changes the flow rate parameter in bypass lines to match the main process fluid velocity, ensuring that swept fluid is removed at the same rate it enters dead zones. This parameter matching prevents composition discontinuities and recirculation disturbances while effectively eliminating pollution
3Object-generated harmful factors
If flow rate in bypass lines is increased to improve sweeping, then dead zone pollution is reduced, but synchronicity with main process is lost
Solution Approach 1:
The invention implements feedback control by continuously monitoring the main process fluid velocity and adjusting bypass line flow rates accordingly. This ensures the swept fluid volume matches the main process flow, maintaining synchronicity while effectively clearing dead zones of pollution
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 solute extraction while minimizing pollution and recirculation, achieving improved performance compared to existing methods by maintaining synchronicity and rinsing rates in the diversion lines.
Implementation Method 1
at least one column comprising a plurality of adsorbent beds separated by trays
Implementation Method 2
zone 1 for desorption of the extract compounds, between the injection of the desorbent and the withdrawal of the extract
Data Source
Figure 1
AI summary
Simulated moving bed separation process of a feed (F) in which, when a fluid/effluent (feed F, desorbent D, extract E, raffinate R) is injected/withdrawn to/from a chosen tray (Pi) by an external bypass line (Li-1/i, Li/i+1) connected to said chosen tray (Pi), the flow rate within said external bypass line (Li-1/i, Li/i+1) is controlled such that: a major fraction of the fluid/effluent (F, D, E, R) is injected/withdrawn to/from the chosen tray (Pi); and a minor fraction of the fluid/effluent (F, D, E, R) is injected/withdrawn to/from the adjacent tray (Pi-1, Pi+1) connected to said external bypass line (Li-1/i, Li/i+1).