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1 A Theoritical Study On Removal And Recovery Of Volatile Organic Compounds From Aqueous Solutions By Pervaporation ABSTRACT  Strategies for dealing with industrial liquid wastes involve both reducing the quantity produced and their environmental impact. So there is a considerable amount of research work going on throughout the world for better and better technologies for reduction, recovery and recycling of hazardous liquid wastes. Adsorption methods using activated charcoal and biological treatment are the presently practicing methods industrially for the treatment of liquid discharges. However these are not very energy efficient methods. Pervaporation proves to be a good alternative to the currently practicing methods of recovering organic solvents from process effluents since it has the advantages – improved selectivity, reduced energy consumption and separation of azeotropic mixtures and mixture of components with close boiling points. Pervaporation is an energy efficient (low temperatures and pressures) combination of membrane  permeation  and  evaporation.  It  is  often  an  attractive  alternative  to  other separation methods. Pervaporation is a membrane process in which a liquid is maintained at atmospheric pressure on the feed or upstream side of the membrane and where permeate is removed as a vapor because of a low vapor pressure existing on permeate or downstream side. This low (partial) vapor pressure can be achieved by employing a carrier gas or using a vacuum pump. Membranes like poly dimethylsiloxane (PDMS), polyamide, copolymers and ceramic- filled membranes have shown high selectivity for removal of VOCs such as chloroform, benzene and toluene from water by pervaporation due to their hydrophobic nature. In this present study the factors affecting the membrane performance such as molecular flux, perm selectivity, permeability coefficient are described. The status of the research work carried out on  preparation  of  various  suitable  membranes  for  the  removal  of  VOCs  has  also  been explained. Key words: Pervaporation, Volatile organic compounds, membrane materials INTRODUCTION Pervaporation is a membrane technology utilizing a dense non-porous polymeric film to  separate  the  contaminated  water  from  a  vacuum  source.  In  the  last  three  decades considerable interest has been evinced in membrane based separation processes. Kober(1) observed, that water evaporated out of a tightly closed colloidion bag, which was suspended

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Page 1: A Theoritical Study on Removal and Recovery of Volatile Organic Compounds From Aqueous Solutions by Per Vapor at Ion

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http://www.cheresources.com/
http://www.membrane.nl/
http://www.scej.org/
mailto:[email protected]
http://www.matlabcodes.com/

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