Zur Optimierung des Lösungsmittelgradienten bei einer chromato graphischen Trennung

The dehydration and recycling of industrial solvents often requires complex processes due to azeotropes and pronounced pinch-points. Combined processes consisting of distillation and pervaporation/vapor permeation might overcome these thermodynamic limitations and offer economically attractive alternatives by simplifying process structure, reducing energy consumption, and avoiding entrainers. The technical and economical feasibility of organic solvent dehydration by pervaporation and vapor permeation with inorganic membranes was evaluated. A survey of the process industry revealed the most attractive applications. The separation of 2-propanol and water was studied in detail. For all process calculations the commercial software Aspen Plus was used. Compatible Fortran routines were developed to incorporate membrane units into the program. Different process configurations to integrate pervaporation and vapor permeation with distillation are compared to conventional separation by extractive distillation. A hybrid process design should take advantage of the specific benefits of both separation methods. Often, savings in energy consumption of up to 85% are possible. Investment and operation costs can be reduced by more than 40% in comparison to conventional processes. The most attractive design is distillation and further purification of the top stream by a membrane unit. Here, the economical benefits increase from adiabatic pervaporation over isothermal pervaporation to vapor permeation. A sensitivity analysis of various parameters affecting the operating costs of the plant was carried out.

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Design and Optimization of Hybrid Separation Processes for the Dehydration of 2-Propanol and Other Organics

Sommer

Melin

2004

Ind. Eng. Chem. Res.

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Zur Optimierung des Lösungsmittelgradienten bei einer chromato graphischen Trennung

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Design and Optimization of Hybrid Separation Processes for the Dehydration of 2-Propanol and Other Organics

Design and Optimization of Hybrid Separation Processes for the Dehydration of 2-Propanol and Other Organics

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