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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Taveira, P (Autor) Outra; Cruz, P (Autor) Outra; Mendes, A (Autor) FEUP; Costa, C (Autor) FEUP; Magalhaes, F (Autor) FEUP

Revista

Título: Journal of Membrane Science

Vol. 188

Páginas: 263-277

ISSN: 0376-7388

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

ISI Web of Science

Scopus - 4 Citações

COMPENDEX

Classificação Científica

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia química ; Ciências Tecnológicas > Tecnologia > Tecnologia química > Tecnologia de polímeros

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15