Permeation of methanol vapor through silica membranes prepared by the CVD method with the aid of evacuation

被引：13

作者：

Kuraoka, K ^{[1
]}

Zhang, SG

Okita, K

Kakitani, T

Yazawa, T

机构：

[1] AIST, Osaka Natl Res Inst, Dept Opt Mat, Adv Glass Sect, Osaka 5638577, Japan

[2] Cent S Univ Technol, Changsha 410083, Hunan, Peoples R China

[3] Ohara Inc, Kanagawa, Japan

来源：

JOURNAL OF MEMBRANE SCIENCE | 1999年 / 160卷 / 01期

关键词：

inorganic membranes; methanol vapor permeation; chemical vapor deposition; silica membrane; molecular sieving membrane;

D O I：

10.1016/S0376-7388(99)00077-0

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Silica membranes were prepared by depositing silica on porous glass tubes with the aid of evacuation using tetraethoxysilane as a reactant in the temperature range 673-773 K. The basic permeation properties of methanol vapor in gas phase were investigated. This membrane appears to hinder permeation of methanol vapor. This behavior is quite different from the original porous glass and other reported membranes. The separation factors of He/CH3OH were 7.1 at 373 K and 16.9 at 473 K. These values are much higher than the Knudsen value (He/CH3OH=2.8). The permeances of He and N-2 through this membrane were also measured for varying temperatures in order to investigate the permeation mechanism. Gas permeation through the membrane was predominantly governed by an activated diffusion mechanism. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：31 / 39

页数：9

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