Pervaporation
A THEORITICAL STUDY ON REMOVAL AND RECOVERY OF VOLATILE ORGANIC COMPOUNDS FROM AQUEOUS SOLUTIONS BY PERVAPORATION
JAGADEESH KUMAR. Y *a, NAGA KUMAR. Vb.
*a III/IV B.Tech chemical engineering, R.V.R & J.C College of engineering, GUNTUR.
E-mail: abhi.chemico@gmail.com.
bIII/IV B.Tech chemical engineering, R.V.R & J.C College of engineering, GUNTUR.
E-mail: naga.vootla@gmail.com.
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
JAGADEESH KUMAR. Y *a, NAGA KUMAR. Vb.
*a III/IV B.Tech chemical engineering, R.V.R & J.C College of engineering, GUNTUR.
E-mail: abhi.chemico@gmail.com.
bIII/IV B.Tech chemical engineering, R.V.R & J.C College of engineering, GUNTUR.
E-mail: naga.vootla@gmail.com.
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