Separation of CFC-12 from air by polyimide hollow-fiber membrane module

• Published in: Journal of membrane science Vol. 105; no. 3; pp. 177 - 185
• Main Authors: Chung, Ik-Jae, Lee, Kwang-Rae, Hwang, Sun-Tak
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.1995; Elsevier
• Subjects: Air/CFC-12; Chemistry; Colloidal state and disperse state; Exact sciences and technology; Gas separation; General and physical chemistry; Hollow-fiber; Membranes; Permeation rate; Polyimide membrane; Separation factor; Separation factor; Polyimide membrane; Gas separation; Air/CFC-12; Permeation rate; Hollow-fiber; Polyimide; CFC fluid; Organic perhalocompound; Pollution control; Binary system; Temperature effect; Fluorine Compounds; Composition effect; Air; Experimental study; Membrane separation; Gas permeability; Pressure effect; Hollow fiber; Membrane; Air pollution; Mathematical model; Application; Chlorine Compounds
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/0376-7388(95)00058-K

The performance of a polyimide membrane module was investigated for the separation of air/CFC-12 mixtures as a function of temperature, pressure, stage cut, and feed gas composition. The ideal separation factor was in the range of 60 to 200 in the ranges of temperature and pressure studied. There was a substantial decrease in the permeation rates of the more permeable gas (air) through the glassy polymer (polyimide) caused by the presence of the other gas (CFC-12). However, the permeation rate of CFC-12 (dichlorodifluoromethane, CCl 2F 2), which is the less permeable gas, was increased by the presence of the more permeable gas (air). It was found that experimental data were well correlated with prediction of mathematical models.