Liquid-Liquid Extraction Cell With Guide Walls
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Solution Overview
Problem
Existing liquid-liquid extraction methods are inefficient in increasing separation quantity per unit area, speeding up the separation process, reducing residual droplets, and achieving mass transfer equilibrium, while also allowing flexible dispersion direction and preventing solution phase reflux.
Innovation Solution
The method involves dividing the dispersion into sideways flows at the feed end, guiding it to rise diagonally and compressing it, then dividing it into sub-flows that proceed along the cell length, using inclined guide walls and vertical slots to separate the solutions effectively and prevent reflux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dispersion is fed directly in the lengthwise direction of the cell, then the separation process is simpler, but the separation quantity per unit area is reduced and the separation rate is decreased
Solution Approach 1:
The cell is divided into distinct functional zones: a feed end zone with guide walls for flow distribution, a separation zone with separator elements, and a drain end zone. This segmentation allows the dispersion to be distributed along the width first, then separated in controlled stages, increasing separation quantity per unit area while maintaining manageable structural complexity through functional zoning.
Solution Approach 2:
Instead of feeding dispersion directly in the lengthwise direction (one-dimensional flow), the guide walls redirect the flow to proceed sideways along the width of the cell first, then gradually transition to lengthwise flow near the bottom. This two-stage flow path utilization of both width and length dimensions increases the effective separation area and improves separation rate.
2Manufacturing precision
If the dispersion is allowed to proceed freely in all directions, then the flow distribution is more natural, but the separation precision and control over solution phases is reduced
Solution Approach 1:
Different regions of the cell are designed with specific flow control characteristics: the feed end has guide walls for lateral distribution, the middle section has separator elements for phase separation, and the bottom region allows controlled lengthwise flow. This local differentiation of flow control mechanisms achieves high separation precision while maintaining relatively simple operation through gravity-driven flow.
Solution Approach 2:
The cell design utilizes gravity as the driving force for dispersion flow and phase separation, eliminating the need for complex pumping or agitation systems. The guide walls and separator elements guide the natural flow paths, achieving precise separation control through passive geometric features rather than active control mechanisms, thus maintaining ease of operation.
3Productivity
If the solution phase separated on the cell bottom is allowed to flow back towards the feed end, then the circulation might improve mixing, but the separation efficiency is reduced and mass transfer equilibrium is not achieved
Solution Approach 1:
The guide walls and separator elements are positioned asymmetrically to create unidirectional flow paths. The feed end guide walls direct flow laterally then forward, while the drain end configuration prevents backward flow of the separated heavy phase. This asymmetric geometry achieves reflux prevention and maintains high separation rate without requiring complex mechanical barriers or additional energy input.
4Reliability
If the mixer spaces are enlarged to improve mixing, then the mass transfer reactions are enhanced, but the cell volume increases and the separation process becomes slower
Solution Approach 1:
The cell is segmented into a compact feed end zone with guide walls for initial flow distribution and a longer separation zone with multiple separator elements. This segmentation allows efficient use of space: mixing occurs in the compact feed region, while separation proceeds through the extended separation zone with multiple stages, achieving mass transfer equilibrium without excessive total volume or separation time.
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 separation efficiency by bringing mass transfer reactions closer to equilibrium, increases separation rate, and allows flexible dispersion direction, while preventing solution phase reflux, thus improving overall separation performance.
Implementation Method 1
A first solution and a second solution, which is heavier than the first solution, can be separated from the dispersion of said solutions
Implementation Method 2
the lighter first solution (generally an organic phase) is separated into an upper solution phase, and the second solution is separated below the upper solution phase into a lower solution phase (generally an aqueous solution)
Implementation Method 3
during the rise, the dispersion is compressed to a predetermined degree of compression
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
The invention relates to a method and arrangement for separating two solutions mixed in dispersion into two solution phases in a liquid-liquid extraction separation cell (1). The arrangement includes a first guide wall (4), which is arranged at a distance from that end wall (15) of the cell (1) that is located on the side of the feed end (2), in order to extend along the whole width of the cell with respect to the vertical direction at an inclined angle (a). The first guide wall includes a bottom edge (5), which is located at a distance (H1...H2) from the cell bottom, so that in between the bottom edge (5) and the cell bottom (3), there is left a clearance gap (6) widening from the center towards the cell sides. The second guide wall (7) is essentially parallel with the first guide wall (4) and placed at a distance (L1) therefrom, so that in between the first guide wall (4) and the second guide wall (7), there is formed an uptake shaft (8) extending diagonally upwards at an inclined angle (a). The second guide wall (7) includes a bottom edge (13), which is pressed tightly against the cell bottom (3), a number vertical slots (9), which are arranged as a horizontal line (10) of vertical slots, said line extending along the width of the second guide wall at a distance from the bottom edge (13), and a slanting plate (11), which is attached to the second guide wall (7), in the vicinity of the top part of the line (10)of vertical slots.