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作者 Shah, Mitesh R
書名 Pervaporation: Process design and membrane characterization
國際標準書號 9780542942334
book jacket
說明 247 p
附註 Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5904
Adviser: Richard D. Noble
Thesis (Ph.D.)--University of Colorado at Boulder, 2006
Pervaporation is a process for the separation of liquid mixtures using a nonporous membrane. This process has been investigated in the literature for several applications including dehydration of organics, azeotropic separations and flavor recovery. We have investigated the various steps involved in the design procedure for pervaporation, identified potential areas of improvement and proposed mitigating solutions
The first step in the pervaporation design procedure is the characterization of the transport properties of the membrane. The transport through a nonporous polymer membrane occurs by sorption and diffusion in the membrane. The knowledge of the transport properties facilitates systematic process design and membrane selection. A technique for characterization of these properties would enable creation of a knowledge base and facilitate a fundamental understanding of transport through the membrane. With this aim in mind, an experimental technique has been developed for the simultaneous determination of sorption and diffusion in nonporous membranes using transient permeation experiments. It has also been demonstrated that simultaneous determination of sorption and diffusion parameters is possible using the proposed method for single component permeation
In order to analyze the results of the experiments, a generalized time-lag method has been developed. In the case of two component diffusion in polymers, current diffusion models do not account for the concentration dependence of diffusivity. Hence, a suitable model for multicomponent diffusion of small molecules in polymers has been proposed on the basis of earlier work in the literature
The next step in the pervaporation design procedure is the process design. Hence, a standalone software for process design has been developed. A simple pervaporation model has also been incorporated as a custom unit operation in a process simulator, Aspen Plus
Finally, the overall design of the pervaporation system has been investigated. A novel process configuration has been proposed to minimize the energy costs associated with the process and proof-of-concept experiments have been carried out. A pervaporation/air stripping hybrid process has also been proposed for groundwater treatment and a sensitivity analysis has been carried out
School code: 0051
Host Item Dissertation Abstracts International 67-10B
主題 Engineering, Chemical
Alt Author University of Colorado at Boulder
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