In:
Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 77, No. 10 ( 1999-10-01), p. 1671-1677
Abstract:
Two types of hydrophobic zeolites Y were prepared by treating the NaY-type zeolite with SiCl 4 , with or without subsequent hydrothermal treatment. X-ray diffraction analysis showed that the framework of the two modified zeolites Y are more perfect than that of the NaY one, and the Si/Al ratio is greatly enhanced by hydrothermal treatment. The determined sorption isotherms indicate an improvement of the ester-to-water sorption ratio with the increase in Si/Al ratio. When the zeolite-filled silicone membranes are used in separation of ethyl acetate - water mixture by pervaporation, both the total permeation flux and the selectivity to the ester are improved by the use of the hydrophobic zeolite Y as the filler in the membrane. The stronger the hydrophobicity of the zeolite Y, the higher the filled membrane selectivity.Key words: hydrophobic zeolites Y, silicone-filled membranes, ethyl acetate - water mixture, sorption, pervaporation.
Type of Medium:
Online Resource
ISSN:
0008-4042
,
1480-3291
Language:
French
Publisher:
Canadian Science Publishing
Publication Date:
1999
detail.hit.zdb_id:
1482256-8
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