Abstract
The polycrystalline silicalite membrane was prepared on the stainless steel porous support and it was silylated using methyltrichlorosilane (CH3SiCl3) as a silylating agent in order to improve its pervaporation performance. The pervaporation performance of the membrane before and after the silylation was measured using a 15 vol% acetic acid/water mixture. The pervaporation performance of the silicalite membarne was improved by the silylation. Namely, the high concentration of acetic acid in the permeate (>45 vol%) was obtained by the silylation, although the flux decreased. This indicates that the silylation using CH3SiCl3 is useful for improvement of the separation performance of the polycrystalline silicalite membrane for the acetic acid/water mixture. It seems that the high pervaporation performance of the silylated silicalite membrane is attributable to the enhancement of hydrophobicity of the membarne surface.
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