Transport Mechanisms in Membrane Separation Processes

Nonfiction, Science & Nature, Science, Chemistry, Technical & Industrial, Technology
Cover of the book Transport Mechanisms in Membrane Separation Processes by J.G.A. Bitter, Springer US
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: J.G.A. Bitter ISBN: 9781461536826
Publisher: Springer US Publication: December 6, 2012
Imprint: Springer Language: English
Author: J.G.A. Bitter
ISBN: 9781461536826
Publisher: Springer US
Publication: December 6, 2012
Imprint: Springer
Language: English

The present book contains a comparison of existing theoretical models developed in order to describe membrane separation processes. In general, the permeation equations resulting from these models give inaccurate predictions of the mutual effects of the permeants involved, due to the simplifications adopted in their derivation. It is concluded that an optimum description of transport phenomena in tight (diffusion-type) membranes is achieved with the "solution-diffusion" model. According to this model each component of a fluid mixture to be separated dissolves in the membrane and passes through by diffusion in response to its gradient in the chemical potential. A modified Flory-Huggins equation has been derived to calculate the solubility of the permeants in the membrane material. Contrary to the original Flory-Huggins equation, the modified equation accounts for the large effect on solubility of crystallinity and elastic strain of the polymer chains by swelling. The equilibrium sorption of liquids computed with this equation was found to be in good agreement with experimental results. Also, the sorption of gases in both rubbery and glassy polymers could be described quan­ titatively with the modified Flory-Huggins equation without any need of the arbitrary Langmuir term, as required in the conventional "dual-mode" sorption model. Furthermore, fewer parameters are required than with the at least identical accuracy.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

The present book contains a comparison of existing theoretical models developed in order to describe membrane separation processes. In general, the permeation equations resulting from these models give inaccurate predictions of the mutual effects of the permeants involved, due to the simplifications adopted in their derivation. It is concluded that an optimum description of transport phenomena in tight (diffusion-type) membranes is achieved with the "solution-diffusion" model. According to this model each component of a fluid mixture to be separated dissolves in the membrane and passes through by diffusion in response to its gradient in the chemical potential. A modified Flory-Huggins equation has been derived to calculate the solubility of the permeants in the membrane material. Contrary to the original Flory-Huggins equation, the modified equation accounts for the large effect on solubility of crystallinity and elastic strain of the polymer chains by swelling. The equilibrium sorption of liquids computed with this equation was found to be in good agreement with experimental results. Also, the sorption of gases in both rubbery and glassy polymers could be described quan­ titatively with the modified Flory-Huggins equation without any need of the arbitrary Langmuir term, as required in the conventional "dual-mode" sorption model. Furthermore, fewer parameters are required than with the at least identical accuracy.

More books from Springer US

Cover of the book Psychopharmacology of Aversively Motivated Behavior by J.G.A. Bitter
Cover of the book Responding to the Homeless by J.G.A. Bitter
Cover of the book Contemporary Nephrology by J.G.A. Bitter
Cover of the book Monoclonal Antibodies and Breast Cancer by J.G.A. Bitter
Cover of the book Social Psychology in Transition by J.G.A. Bitter
Cover of the book The Role of the State in Pension Provision: Employer, Regulator, Provider by J.G.A. Bitter
Cover of the book Somatic Selection and Adaptive Evolution by J.G.A. Bitter
Cover of the book Design of Low-Voltage CMOS Switched-Opamp Switched-Capacitor Systems by J.G.A. Bitter
Cover of the book Guide to Effective Grant Writing by J.G.A. Bitter
Cover of the book Cushing's Disease by J.G.A. Bitter
Cover of the book Sexual Perversion by J.G.A. Bitter
Cover of the book Machining of Polymer Composites by J.G.A. Bitter
Cover of the book Poisons of Plant Origin by J.G.A. Bitter
Cover of the book Promoting Nonviolence in Early Adolescence by J.G.A. Bitter
Cover of the book Alcoholism and Women by J.G.A. Bitter
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy