Centrifugal Chromatography Cells with Circular Channels
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Solution Overview
Problem
Centrifugal liquid-liquid chromatography devices face inefficiencies due to the design of cells and connecting channels, including non-homogeneous liquid dispersion, pressure drops, and increased dead volumes, which reduce the separation efficiency and productivity.
Innovation Solution
The design features cells with a geometric shape of revolution and circular, elliptical, or parallelepipedic channels with specific dimensions, allowing for improved liquid dispersion and reduced pressure drops, along with a manufacturing method involving machining half-cells on discs and assembling them to form entire cells with direct sealing, optimizing the flow and separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cells are connected by ribbon-shaped channels, then the device structure is simplified, but pressure drop increases and dead volume increases
Solution Approach 1:
The patent replaces ribbon-shaped channels with circular cross-section channels. This curvature change reduces flow resistance and pressure drop while minimizing dead volume, directly resolving the contradiction between structural simplicity and hydraulic performance.
Solution Approach 2:
The patent optimizes channel dimensional parameters by specifying that the channel diameter should be between 0.5 to 2 times the cell diameter, and channels should be positioned at specific radial distances from the cell center. These parameter changes optimize flow characteristics to reduce pressure drop while maintaining structural simplicity.
2Device complexity
If cells are connected by ribbon-shaped channels, then the device structure is simplified, but dead volume increases reducing efficiency
Solution Approach 1:
The circular cross-section of channels eliminates the flat surfaces and sharp edges of ribbon-shaped channels, creating smoother flow paths with reduced flow separation and vortex formation. This reduces dead volume where products remix, thereby improving separation efficiency while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from two-dimensional ribbon-shaped channels to three-dimensional circular channels with optimized radial positioning. This dimensional optimization reduces flow path length and eliminates stagnant zones, improving productivity without significantly increasing structural complexity.
3Ease of manufacture
If water jet cutting is used to manufacture channels, then manufacturing is simplified, but velocity gradient appears causing remixing
Solution Approach 1:
The patent specifies precise parameter ranges for channel dimensions (diameter 0.5 to 2 times cell diameter) and positioning (radial distance from cell center). These controlled parameters ensure that even with water jet cutting, the velocity gradients are minimized by optimizing the geometric relationships, thus maintaining separation efficiency while preserving manufacturing simplicity.
4Ease of manufacture
If flexible seals are used between discs, then assembly is simplified, but cell geometry deforms over time
Solution Approach 1:
The patent employs rounded cell shapes with curved surfaces instead of sharp angles. This curvature distributes mechanical stresses more evenly across the cell structure and flexible seals, reducing localized deformation over time while maintaining ease of assembly, thus improving geometric stability without sacrificing assembly simplicity.
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 the separation efficiency and productivity of chromatography devices by promoting better liquid exchange and reducing pressure drops and dead volumes, leading to improved separation performance.
Implementation Method 1
Rotation of the stack creates a high centrifugal acceleration field that allows to keep in place the liquid phase referred to as fixed stationary phase
Implementation Method 2
Separation of the constituents of a feed in liquid solution consisting of at least two constituents having different partition coefficients, such that they are entrained at unequal velocities by the mobile phase
Data Source
AI summary
The present invention relates to cells (1) for a centrifugal partition chromatography column, consisting of stacked discs and comprising a network of three-dimensional cells interconnected in series and communicating with liquid phase circulation channels, said cells being distributed over the periphery of at least one disc driven into rotation about a main axis (8); the cells have a geometric shape of revolution about a substantially radial axis with respect to said disc and they are connected by channels (2, 4) of substantially circular, elliptical or parallelepipedic section, the main two dimensions of which are smaller than the largest cross-section of the cell.The invention also relates to methods of manufacturing these cells.