Considerations on the performance of hollow-fiber modules with glassy polymeric membranes

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Taveira, P (Author) Other; Cruz, P (Author) Other; Mendes, A (Author) FEUP; Costa, C (Author) FEUP; Magalhaes, F (Author) FEUP

Journal

Title: Journal of Membrane Science

Vol. 188

Pages: 263-277

ISSN: 0376-7388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

ISI Web of Science

Scopus - 4 Citations

COMPENDEX

Scientific classification

CORDIS: Technological sciences > Technology > Chemical technology ; Technological sciences > Technology > Chemical technology > Polymer technology

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-000-TY1

DOI: 10.1016/s0376-7388(01)00384-2

Abstract (EN): Glassy polymeric membranes are widely used in the separation of gas mixtures. Typically, the permeability of these membranes has a pressure and composition dependence that is well described by the dual-mode transport model. Nevertheless, for simplicity, most of the hollow-fiber permeator models only consider constant permeability, which can lead to inaccurate results. A comparative theoretical study is performed on the influence of two different membrane mass transport models on gas separation hollow-fiber modules: the constant permeability and the dual-mode transport models. The comparison is performed in terms of the recovery and purity of the faster gas, under different design and operation conditions. Simulations are performed for the He/CH4 separation in a polycarbonate membrane. It is shown that the differences in performance exhibited by the two models can go up to 10% for recovery and 5% for purity, particularly for high-permeate pressures. Pressure drop on the retentate and permeate sides is analyzed. Two pressure drop models based on Hagen-Poiseuille equation are considered and compared: constant viscosity, evaluated for feed conditions, and composition-dependent viscosity. It is concluded that neglecting viscosity composition dependency can lead to errors up to 20% in pressure drop calculations, consequently affecting the hollow-fiber performance in terms of recovery and purity.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15