Abstract
The objective of this communication is to study pressure drop in the annulus of annular-hollow-fibre membranes used in an internally staged permeator (ISP). A new pressure drop equation, known as the annulus-pressure drop model (Lim, 2000) developed from the continuity equation and the momentum balance equations with the consideration of gas compressibility and fibre permeability has been employed in this study. Comparison of the results obtained from the annulus-pressure drop model and the Hagen-Poiseuille equation has been carried out, and pure gas/vapour permeation together with the separation of n-pentane from N 2 stream have been as examples to illustrate the importance of the pressure drop equation developed.
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