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Perstraction
Perstraction is a typical perstraction includes two liquid phases but only other phase includes an extractant. Perstraction can be more gentle, faster and cheaper than the traditional biphase extraction. There many potential applications. Perstraction has been applied to oil refining, decontamination of drinking water and improving the downstream process in biorefineries (source?).
Perstraction is about 30-year-old technique. It is analogous to pervaporation. The technique is used commercially (source?). There are many good ideas and potential applications but they have met problems. Membranes can not be done in the cheap way. Usually many compounds can not be extracted concurrently.
== Introduction ==
Perstraction is the separation technique which has been developed from biphase extraction. Phases are separated by a membrane in perstaction.〔LUQUE, R., CAMPELO, J. and CLARK, J., eds, 2011. Handbook of Biofuels Production – Processes and Technologies. Woodhead Publishing.〕 Organic and aqueous phases do not mix in each other. A basic perstraction is called the single perstraction or membrane perstraction. An advantage is minimizing toxic damage to microorganisms or enzymes. Nevertheless perstraction includes problems like expensive membranes, clogging and fouling of membranes.〔
Membrane perstraction is not only perstraction technique (Figure 2). Capsular perstraction is fast saving energy and solvents.〔WHELEHAN, M. and MARISON, I.W., 2011. Capsular perstraction as a novel methodology for the recovery and purification of geldanamycin. Biotechnology progress, 27(4), pp. 1068–1077.〕 Unfortunately capsules ca not be produced large amounts in the cheap way and the alginate capsule is labile mechanically. Enzymes can be immobilized to the capsule membrane.〔WYSS, A., VON STOCKAR, U. and MARISON, I.W., 2006. A novel reactive perstraction system based on liquid-core microcapsules applied to lipase-catalyzed biotransformations. Biotechnology and bioengineering, 93(1), pp. 28–39.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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