Modulated By-pass Flow for Simulated Moving Bed Separation
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Solution Overview
Problem
Simulated moving bed (SMB) separation processes face challenges in minimizing pollution and recirculation due to fluid composition discontinuities and small pressure differences, which affect the concentration profile and operational efficiency.
Innovation Solution
Implementing a process with external by-pass lines that adjust flushing flow rates to achieve super-synchronicity, defined by specific formulas, in each operational zone of the SMB device, allowing for optimized flushing based on the presence or absence of closed by-pass lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional synchronous flushing is used in SMB separation processes, then the system maintains operational stability, but the separation performance (yield and purity) is suboptimal
Solution Approach 1:
The patent applies dynamics by transitioning from fixed synchronous flushing to modulated flushing that adapts to operational conditions. The flushing flow rate is dynamically adjusted based on the operational zone and presence of closed by-pass lines, allowing the system to optimize separation performance while maintaining stability through controlled variation rather than rigid fixed parameters
Solution Approach 2:
The patent implements parameter changes by modifying the flushing flow rate parameter according to specific operational conditions. Different flushing flow rates are applied in different operational zones, and the flow rate is adjusted based on whether by-pass lines are closed or open, enabling optimization of separation performance through systematic parameter variation
2Productivity
If flushing flow rates are increased to improve separation performance, then yield and purity increase, but fluid composition discontinuities and recirculation effects are amplified
Solution Approach 1:
The patent applies local quality by implementing zone-specific flushing strategies. Different operational zones receive different flushing flow rates tailored to their specific requirements and characteristics. The flushing parameters are localized to each zone rather than applied uniformly, allowing optimization of yield while minimizing harmful recirculation effects in each specific location
Solution Approach 2:
The patent implements feedback mechanisms that monitor operational conditions and adjust flushing flow rates accordingly. The system responds to actual operational state by modulating flushing parameters based on observed performance and composition profiles, enabling dynamic optimization that prevents harmful discontinuities while maintaining high yield
3Object-generated harmful factors
If by-pass lines are closed to reduce recirculation, then fluid composition discontinuities are minimized, but flushing effectiveness is reduced
Solution Approach 1:
The patent applies dynamics by making the by-pass line configuration dynamic rather than static. The system adapts the opening/closing state of by-pass lines based on operational zone requirements and flushing needs. This dynamic configuration allows the system to minimize recirculation effects when appropriate while maintaining flushing effectiveness when needed, optimizing separation efficiency through adaptive control
4Ease of operation
If uniform flushing flow rates are applied to all zones, then system operation is simplified, but zone-specific optimization is lost
Solution Approach 1:
The patent applies local quality by implementing zone-specific flushing strategies. Different operational zones receive different flushing flow rates tailored to their specific requirements and characteristics. The flushing parameters are localized to each zone rather than applied uniformly, allowing optimization of separation performance through systematic parameter variation
Solution Approach 2:
The patent implements segmentation by dividing the SMB system into distinct operational zones, each with its own flushing control. This segmentation allows independent optimization of flushing parameters for each zone based on its specific function and requirements, enabling zone-specific performance optimization while maintaining overall system coordination
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 separation performance by improving yield and purity of products like para-xylene, achieving higher yields than traditional synchronous flushing methods by optimizing flow rates zone-dependently.
Implementation Method 1
external by-pass lines Li/i+1 joining two successive plates Pi, Pi+1 directly, allowing said plates to be flushed, in which each of the by-pass lines Li/i+1 comprises automated means for regulating the flushing flow rate
Implementation Method 2
zone 3=zone for adsorption of compounds from the extract, comprised between the feed injection and the raffinate R withdrawal
Implementation Method 3
zone 1=zone for desorption of compounds from the extract, comprised between the injection of the desorbant D and withdrawal of the extract E
Data Source
AI summary
A process for separating a feed F by simulated moving bed adsorption in a SMB device comprises at least one zone 1 for desorption of the compounds produced in the extract, a zone 2 for desorption of the compounds produced in the raffinate, a zone 3 for adsorption of the compounds produced in the extract, a zone 4 located between the raffinate withdrawal and the desorbant supply, the device comprising external by-pass lines Li/i+1 directly connecting two successive plates Pi and Pi+1;in which the degree of opening of means for restricting the flushing flow rate of the by-pass lines Li/i+1 are sequentially modified such that:1) in an operational zone where there is at least one closed by-pass line, a super-synchronicity of the flushing flow rate is established in all of the by-pass lines which are not closed belonging to the zone under consideration, said super-synchronicity being defined by the following formula:S=a+b(nf/nt)in which the constant a is a constant in the range −5 to 5 and b is a constant in the range 40 to 100;2) if there is no closed by-pass line in the zone under consideration (in other words if all of the by-pass lines of the zone are open), then a flow is established in all of the flushing lines of said zone which corresponds to the synchronicity plus or minus 8%.