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Separation of Supercritical Carbon Dioxide and Caffeine with Mesoporous Silica and Microporous Silicalite Membranes by Chung-Sung Tan; Hao-Chuan Lien; Shin-Ru Lin; Hsin-Ling Cheng; Kuei-Jung Chao is a Engineering article available to read on EtoBox.

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The regeneration of supercritical carbon dioxide from a mixture containing caffeine by the prepared mesoporous silica and microporous silicalite membrane filters was studied. The mesoporous silica layer, with an average pore opening of 2.5 nm, was deposited on a tubular a-alumina filter. The experimental data showed that a caffeine rejection as high as 0.98 in the first 6 h and a supercritical carbon dioxide permeation flux of 0.074 mol/m 2 /s could be obtained at 35 8C and 13.79 MPa. The mass transfer resistance in the coated mesoporous silica layer was found to be negligible and the adsorption in the silica layer to be the major mechanism in the separation. Because of the occurrence of adsorption, a steady state operation was hard to achieve and caffeine rejection would drop when the adsorption equilibrium was approached. For the prepared microporous silicalite membrane with pore openings of 0.5 Á/0.6 nm, a caffeine rejection of 1.0 was observed at a temperature of 35 8C and a pressure equal to or lower than 12 MPa. The separation under these pressures was based on the molecular sieving mechanism. Due to the presence of some defects, mainly resulting from inter-grain porosity in

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Author

Chung-Sung Tan; Hao-Chuan Lien; Shin-Ru Lin; Hsin-Ling Cheng; Kuei-Jung Chao

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0896-8446)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)