NEW FACILITATED TRANSPORT MEMBRANES FOR THE SEPARATION OF CARBON-DIOXIDE FROM HYDROGEN AND METHANE

被引:96
作者
QUINN, R
APPLEBY, JB
PEZ, GP
机构
[1] Corporate Science, Technology Center, Air Products and Chemicals, Inc., Allentown, PA 18195-1501
关键词
GAS SEPARATIONS; FACILITATED TRANSPORT; LIQUID MEMBRANES; MOLTEN SALT HYDRATE MEMBRANES; CARBON DIOXIDE;
D O I
10.1016/0376-7388(95)00021-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
New facilitated transport membranes which selectively permeate carbon dioxide from hydrogen and methane have been prepared and examined under a variety of conditions. Membranes consist of melts of the salt hydrates tetramethylammonium fluoride tetrahydrate, [(CH3)(4)N]F . 4H(2)O, or tetraethylammonium acetate tetrahydrate, [(C2H5)(4)N]CH3CO2 . 4H(2)O, immobilized in films of Celgard 3401(R). Operating at 50 degrees C, both membranes exhibited CO2 permeabilities which increased with decreasing feed partial pressure of CO2, characteristic of a facilitated transport membrane. Selectivities of CO2/H-2 and of CO2/CH4 increased with decreasing feed pressure since H-2 and CH4 permeances were independent of feed pressure. Selectivities of CO2/H-2 were disappointingly low due to permeation of H-2 through the dense phase of Celgard(R). With some difficulty, the microporous support was eliminated by construction of membranes consisting of liquid [(CH3)(4)N]F . 4H(2)O on the surface of a film of poly( trimethylsilylpropyne). Selectivities of CO2/H-2 as high as 360 were then observed at low feed partial pressures of CO2. Modeling of membrane properties is consistent with permeation of CO2 by a facilitated transport mechanism with reasonable derived diffusivities for the chemically bound CO2 carrier species.
引用
收藏
页码:139 / 146
页数:8
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