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Desorption from concentrated polymer solutions in good and poor solvents

Rao, Sripada P and Gandhi, Kandukuri S and Rao, Davuluri P and Singh, Rakesh P (1993) Desorption from concentrated polymer solutions in good and poor solvents. In: Industrial & Engineering Chemistry Research, 32 (9). pp. 2069-2076.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ie00021a032


The objective of the study was to investigate the effects of the nature of solvent and polymer concentration on the mass-transfer coefficients in desorption of solvents and to develop a correlation to predict them. Desorption was experimentally studied in a Lewis cell with concentrated binary solutions of polymer in good and poor solvents. The range of parameters covered are polymer weight fraction between 0.25 and 0.6, Reynolds number between 3 and 100; Schmidt number between 1.4 X lo6 and 2.5 X lo8, and Sherwood number between 3.5 X lo2 and 1.2 X lo4. Desorption from moderately concentrated solutions (polymer weight fraction -0.25) is gas-phase controlled. Studies with more concentrated solutions showed that the effects of solvent and concentration were such that corrections due to concentration-dependent diffusivity and viscosity as well as high flux had to be applied to the mass-transfer coefficients before they could be correlated.

Item Type: Journal Article
Publication: Industrial & Engineering Chemistry Research
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 03 Feb 2011 11:05
Last Modified: 03 Feb 2011 11:05
URI: http://eprints.iisc.ac.in/id/eprint/35393

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