19th European symposium on computer aided process engineering vol:26 edition:1 pages:779-784
ESCAPE edition:19 location:Cracow date:14-17 June 2009
Membrane processes are becoming more and more important in industry. Therefore, modelling of these processes is also gaining interest, as this offers opportunities to predict process performance, membrane properties, efficiencies and economical aspects. With this information, industry can be helped to improve existing separation processes, or switch to more profitable alternatives.
The choice of the transport model is important to describe membrane transport correctly. For processes with a solution-diffusion transport mechanism, like pervaporation, the Maxwell-Stefan equations have proven to be capable of describing multicomponent transport. In this model, the membrane is considered to be part of the system, and interactions between all system components are accounted for.
Because for the generalized Maxwell-Stefan equations unknown information about the membrane is necessary, like the molar mass, a conversion to mass fractions is performed in this paper. This conversion has consequences for several parameters and these are discussed in this paper.
From an economical point of view, pervaporation is a possible alternative to energy consuming processes, like distillation. If executed solely or in a hybrid process, it can reduce the process energy consumption. As an example of the capabilities of the conversion, a pervaporation case study is simulated. The structure of this simulation program is briefly discussed, and an example is elaborated that shows the applicability of the conversion.