Gas separation by permeation Part I. Calculation methods and parametric analysis

Pan, Chuen Y.; Habgood, H. W.

doi:10.1002/cjce.5450560207

Cited by 82 publications

(26 citation statements)

References 16 publications

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“…For the symmetric membrane, the performance of the membrane for gas separation is strongly dependent on the feed-per-meate flow pattern (countercurrent, cocurrent or cross-flow), and various calculation methods have been reported in the literature Kammermeyer, 1972,1973;Hwang and Kammermeyer, 1975;Naylor and Backer, 1955;Oishi et al, 1961;Pan and Habgood, 1974, 1978a, 1978bThorman et al, 1975;Walawender and Stern, 1972;Steiner, 1950a, 1950b). Some of these models take into account the feed or permeate pressure drop in the membrane module.…”

Section: Mathematical Model On Asymmetric-membrane Permeationmentioning

confidence: 97%

Gas separation by permeators with high‐flux asymmetric membranes

Pan¹

1983

AIChE Journal

128

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The permeation behavior of the high-flux asymmetric membrane differs from that of the conventional symmetric membrane. A calculation method for predicting the gas separation performance of a permeator with asymmetric membrane is presented. The model takes into account the permeate pressure drop and is applicable to both hollow-fiber and spiral-wound modules. The effect of permeate-feed flow pattern on module performance is analyzed. It is shown that for the high-flux asymmetric membrane, the countercurrent flow pattern is not necessarily always the preferred operating mode. The mathematical model is verified by large-scale field pilot-plant experiments for helium recovery from natural gas using large hollow-fiber modules (220 m2/unit). C. Y. PANAlberta Research Council Edmonton, Alberta, Canada SCOPEThe conventional symmetric membrane has a homogeneous structure with uniform permeation properties across its thickness. This type of membrane has not been widely used for gas separation mainly due to low rates of permeation imposed by the membrane thickness required for maintaining membrane integrity and strength. Recent development of asymmetric membranes, however, has made membrane permeation an important unit operation for gas separation. The membrane consists of an ultrathin skin and a porous supporting layer with negligible resistance to gas flow. The skin, which acts as the separation barrier, is highly permeable due to its thinness. This permits the use of highly selective polymers with inherently poor permeability for specific gas separation. The presence of the porous supporting layer, howeve:, renders the permeatiop behavior of the asymmetric membrane somewhat different from that of the familiar symmetric membrane. A calculation method for predicting the performance of a permeator with the high-flux asymmetric membrane is presented. Both hollow-fiber and spiral-wound modules are considered. The effect of flow pattern on the performance of the asymmetric membrane is found to be significantly different from that of the symmetric membrane. Laboratory and pilot-plant data are presented to substantiate the mathematical model. CONCLUSIONS AND SIGNIFICANCEThe porous supporting layer of the asymmetric membrane prevents the mixing of permeate fluxes of varying compositions on the membrane skin surface. Consequently, the asymmetric membrane always gives rise to cross-flow type of permeation regardless of the flow pattern and direction of the bulk permeate stream flowing outside the porous layer. It is this characteristic that sets the permeation behavior of the asymmetric membrane apart from the conventional symmetric membrane.It is shown that, for the asymmetric membrane with narrow permeate flow path such as hollow fibers, the permeate pressure build-up is strongly dependent on the feed-permeate (the bulk stream) flow pattern. The countercurrent mode has the lowest permeate pressure build-up but the feed flow is in the undesirable direction in relation to the permeate pressure build-up. The cocurrent pattern, on th...

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Section: Mathematical Model On Asymmetric-membrane Permeationmentioning

confidence: 97%

Gas separation by permeators with high‐flux asymmetric membranes

Pan¹

1983

AIChE Journal

128

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“…With the aid of Equations (10,11,3), a differential equation can be obtained that relates bulk permeate mole fraction to feed-side mole fraction along the hollow fiber length:…”

Section: Methodology Based On Boundary Value Problemmentioning

confidence: 99%

“…By using Equations (16,10,11), an ordinary differential equation (ODE) is obtained as follows for calculating the pressure build-up in the permeate-side:…”

Section: Methodology Based On Boundary Value Problemmentioning

confidence: 99%

Transport Properties of Asymmetric Hollow Fiber Membrane Permeators for Practical Applications: Mathematical Modelling for Binary Gas Mixtures

Hosseini¹,

Roodashti²,

Kundu

et al. 2015

Can J Chem Eng

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Hollow fiber membrane permeators have gained widespread acceptance for a variety of applications, including gas separation. This study presents our efforts to develop an appropriate methodology and mathematical modelling for the analysis of the transport properties and separation performance in hollow fiber membrane permeators with asymmetric structure. A relatively simplified model, developed based on ideal conditions, provides the opportunity for having a quick and overall prediction of the separation performance; while a comprehensive model developed by incorporation of non-ideal conditions enables a more accurate prediction of the membrane performance. The real gas behaviour, temperature, pressure, and concentration dependence of gas viscosity, as well as pressure changes on both sides of hollow fibers, concentration polarization, temperature change due to permeation, and temperature dependence of permeance are considered non-ideal parameters in development of the model. The integrated models with associated parameters in the form of differential equations are coded in MATLAB and solved as initial value problems using appropriate numerical methods. The validity of the developed models is examined, indicating close agreement between predictions and the experimental data provided in literature. The proposed methodology and developed models provide valuable opportunities for researchers in designing appropriate hollow fiber membrane permeators and processes for practical gas separation applications.

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“…(6) and (7) for the variations in compositions along the permeator are obtained by combining and simplifying Eqs. (1)- (4):…”

Section: Governing Equations For Exact Solutionmentioning

confidence: 99%

“…Neglecting the pressure drop at the feed side and considering it at the permeate side, based on the differential form of the Hagen-Poiseuille equation, the expression for pressure at the permeate side is given by Berman expression [3,6,7], as follows:…”

Section: Governing Equations For Exact Solutionmentioning

confidence: 99%

Modification for CAAM approach for simulation of binary gas mixture separation in nanometric tubular membranes

Razmjoo

Babaluo

2007

Journal of Membrane Science

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Gas separation by permeation Part I. Calculation methods and parametric analysis

Abstract: Calculation methods for single-and multi-stage permeation of a multi-component mixture are presented. The use of the local permeate concentration in the formulation results in a relatively simple form of solution for the binary system in the

Cited by 82 publications

References 16 publications

Gas separation by permeators with high‐flux asymmetric membranes

Gas separation by permeators with high‐flux asymmetric membranes

Transport Properties of Asymmetric Hollow Fiber Membrane Permeators for Practical Applications: Mathematical Modelling for Binary Gas Mixtures

Modification for CAAM approach for simulation of binary gas mixture separation in nanometric tubular membranes

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