Aqueous two phase extraction?an environmentally benign technique

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 becau...

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Published inClean technologies and environmental policy Vol. 5; no. 2; pp. 136 - 141
Main Authors Raghavarao, K. S. M. S., Ranganathan, T. V., Srinivas, N. D., Barhate, R. S.
Format Journal Article
LanguageEnglish
Published Berlin Springer Nature B.V 01.07.2003
Subjects
Aqueous solutions
Environment
Environmental cleanup
Environmental policy
Environmental restoration
Enzymes
Extraction processes
Industrial pollution
Laboratories
Molecular weight
Organic compounds
Plant extracts
Pollution prevention
Polyethylene
Polymers
Polyvinyl alcohol
Remediation
Scholarships & fellowships
Solutes
Surfactants
Temperature
VOCs
Volatile organic compounds
Waste treatment
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Summary: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. [PUBLICATION ABSTRACT]
Bibliography:ObjectType-Article-2
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ISSN:1618-954X
1618-9558
DOI:10.1007/s10098-003-0193-z