Hydrocarbon separation via porous glass membranes surface-modified using organosilane compounds

摘要

The present paper describes the synthesis and properties of porous glass membranes surface-modified using organosilane compounds with different hydrocarbon lengths (C_nH_(2n+1(CH_3)_2SiC; n=1,3,8,18). Single gas permeation through the membranes was measured at 298, 333 and 373 K using He, N_2, CO_2,CH_4,C_2H_6, C_3H_8, n-C_4H_10 and I-C_4H_10. The membranes showed highly selective separation of hydrocarbon gases and high permeances. Hydrocarbon gas selectivity increased with increasing carbon chain length in the hydrocarbon gases and in the organosilane compounds used. For c18 membrane (surface-modified with dimethyloctadecylchlorosilane), the ratio of the permeances, n-C_4H_10/N_2 was 66.6 at 289 K, 22.5 at 333 K and 14.0 at 373 K.