Gas separation under cross-flow conditions

2 Gas separation under cross-flow conditions 

The superscript indicates the high pressure feed side.The penneate concentration Xp j can be expressed as 

With the. e two models, perfect mixing and cross-flow gas separation and vapour separation can be well described. Other configurations will not be described here but the reader is referred to a number of articles and books (see e.g.ref. 8 and 9). The derivations and solutions are rather similar to the ones given above and the results do not differ significantly in general. In addition, these flow patterns are. at least in gas separation and vapwur permeation are not commonly tilled. 

Both driving force and permeability coefficient are temperature and concentration dependent. (Compared to gas separation the same equations can be applied but the calculations become somewhat more complex. Two process configurations will be discussed here, complete mixing at feed side and permeate side, the easiest case to calculate and secondly cross-flow at feed side and complete mixing at the vapour side. Commercial pervaporation systems operate under conditions similar to the latter system. Co-current and counter-current systems can be calculated as well but will not be considered here. The reader is referred to literature (see e.g. Hwang and Kammerraeyer [8] or Albrecht and Rautenbach [9]). 

Pervaporation with perfect mixing at feed side and permeate side. 

---

VIll. 16.2 Gas separation under cross-flow conditions... 

---