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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   FEBRUARY 2005 , Volume 14 , Number 2 (56); Page(s) 117 To 130.
 
Paper: 

SEPARATION OF MISCIBLE SOLVENT-WATER SOLUTIONS USING COMPOSITE MEMBRANES EMPLOYING HYDROCOLLOIDS AND NATURAL RUBBER LATEX

 
 
Author(s):  JAZEBI ZADEH M., MALHOTRA V.N.*
 
* School of Computing and Technology, University of East London, Barking Campus London RM8 2AS, UK
 
Abstract: 
A number of composite membranes have been investigated for the separation of water from miscible organic-water mixtures. Organic solvents under study were ethanol, propanol-2 and acetone. Each composite membrane consisted at least of two fused layers. One layer was prepared from a mixture of natural rubber latex solution and the other layer from a solution of hydrophilic colloid between 1.25 to 20 percent by weight on a dry rubber basis. Four hydrophilic colloids, each of different molecular mass, were used in the preparation of each type of membrane. Each composite membrane was vulcanized before use in an all stainless steel membrane cell. These perm-selectivities have been compared with only those obtained from the use of vulcanized natural rubber latex membranes. A special novel design of this cell along with the entire equipment used have been described and discussed. The method of forming a thin film as well as the techniques for checking its soundness have also been presented and discussed. Finally, the proposed mechanism and a model that may be responsible for enhancing the permeation of water through the composite membranes have been discussed. The incorporation of a layer of alginic acid hydrocolloid in the composite membrane did increase the separation factor for water from ethanol-water mixtures by a factor of 24 in comparison to that for a natural rubber membrane alone. Similarly, the separation factors for water with hydrocolloids hydroxypropyl methyl cellulose and methyl cellulose from the solutions containing propanol-2 and acetone were 13.50 and 11, respectively.
 
Keyword(s): COMPOSITE MEMBRANES, PERVAPORATION, HYDROCOLLOIDS, MECHANISM OF SEPARATION
 
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