Thin layer extraction
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Thin layer extraction is a time-periodic reactive liquid extraction process that provides excellent mass transfer, while maintaining phase separation.[1] It is performed via a periodic batch production process utilizing full control of the time of each chemical reaction.
Concept
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Thin layer extraction is recommended for the separation of high value products that are produced in moderate volumes (for example the separation of chiral molecules[2][3]).
Equipment
Thin layer extraction is used in specialized equipment operated as robots consisting of:
- The cartridge. Consisting of a permeable, open, macro-porous matrix, made of a microporous solid substrate, compatible with the extractant phase, and accessible from/to the external world. The replaceable microporous matrix is initially wetted with the extractant, exposing a thin liquid layer on its surface without obstructing the macro-pores.
- Means to bring alternately small batches of the donor and strip solutions to cover as thin layers the thin extractant layer contained in defined sections of the matrix for a controlled time and then collect the product solutions. One method used consists of spraying the solutions over sections of the matrix that exchange positions periodically to be exposed alternately to the donor and the strip solutions. The aqueous layers are then shaken off the matrix and collected as two distinct products. A second method consists of pneumatically pumping at a controlled velocity, in counter-current direction alternating small batches of the donor and strips solutions through a bundle of microporous capillaries. This second method permits a programmable number of stages but does not allow changes in the organic to aqueous ratio (O/W).
- A programmable control system.
A thin layer extraction cell consists of a section of the matrix that takes turn at being alternately exposed to the donor and then the strip solutions. Each cell accepts two alternating aqueous feed batches and generates two corresponding alternating batches of the products.
In multistage operation, a train of cells is operated synchronously with the products from one cell directed as feeds to a next upstream or downstream cell.
The multistage thin layer extraction equipment is linearly scalable, permitting results obtained on table-top laboratory devices to be directly scaled up to full-scale production plants.
References
- ^ Lavie R., “Thin Layer Extraction – A Novel Liquid-Liquid Extraction Method”, AIChE Journal, 54, Issue 4, Pages 957-964, 2008. DOI: 10.1002/aic.11445.
- ^ Lavie R. and Wajc S., “Chiral Resolution by Thin Layer Extraction”, Chemical Engineering Transactions, Volume 24, pages 739-744, 2011, DOI: 10.3303/CET1124124.
- ^ Lavie R., "Chiral Resolution of Ionic Compounds by Thin Layer Extraction", Ind. & Eng. Chemistry Research,2011, Vol. 50, Issue 22, pages 12311-12844, DOI: 10.1021/ie201596n.
