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Aqueous two phase extraction—an environmentally benign technique

Raghavarao, K. S. M. S. and Ranganathan, T. V. and Srinivas, N. D. and Barhate, R. S. (2003) Aqueous two phase extraction—an environmentally benign technique. Clean Technologies and Environmental Policy, 5. pp. 136-141.

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Abstract

Aqueous two-phase extraction (ATPE) is basically a liquid–liquid extraction technique employing two aqueous phases comprising either two polymers or a polymer and a salt. In addition to the other advantages it offers, ATPE is gaining increasing popularity as an environmentally benign technique because (1) it does not employ volatile organic compounds as solvents, (2) it involves phase-forming polymers that rely on the structuring properties of liquid water not only for the formation of phase systems but also for solubilizing the otherwise relatively insoluble hydrophobic solutes, (3) it exploits the remarkable properties of polymers such as polyethylene glycols, polyvinyl pyrrolidone (PVP) etc. and (4) it makes use of phase-forming components which could be recovered and recycled to a limited degree. In some modified form, ATPE is finding application in environmental remediation. ATPE is discussed by considering case studies involving extraction of enzymes for waste treatment and recovery of valuable by-products from waste, extraction of useful components of plant origin and extraction of natural colours. The scope of ATPE in the context of pollution prevention or application for environmental remediation is discussed. Advantages/limitations of ATPE are also discussed. Barriers to a widespread industrial application of ATPE are examined and possible solutions suggested.

Item Type: Article
Uncontrolled Keywords: Aqueous two-phase extraction environmentally benign technique
Subjects: 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 27 Polymer Chemistry
600 Technology > 08 Food technology > 05 Processing and Engineering
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 22 Jun 2007 11:21
Last Modified: 10 Oct 2018 11:04
URI: http://ir.cftri.com/id/eprint/1258

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