Mitsui Petrochemical Industries, Ltd.

Mitsui Chemicals, Inc.

Toshiyuki Isaka

Shintaro Araki

Fujihisa Matsunaga

Katsuo Taniguchi

Naoshi Nagai

Hiroshi Fukuhara

Mitsuki Yasuhara

Masahiro Enna

Production process of bisphenol compounds

A process for the production of lower olefins by dehydrating lower alcohols having 2 to 4 carbon atoms which comprises using a .gamma.-alumina catalyst containing 0.3% by weight or less of impurities in total excluding SiO.sub.2, the impurities including 0.2% by weight or less of sulfur content calculated in terms of SO.sub.4 - and 0.05% by weight or less of sodium content calculated in terms of Na.sub.2 O, and/or a process for the production of lower olefins by dehydrating lower alcohols having 2 to 4 carbon atoms that comprises using a .gamma.-alumina catalyst which contains 0.5 to 5% by weight of SiO.sub.2. According to the process of the present invention, lower olefins can be produced from lower alcohols with high yield and high selectivity for a prolonged period of time without reducing the catalytic activity.

Process for producing lower olefins

Propylene can be prepared in high yield and selectivity by dehydrating isopropanol in the presence of a .gamma.-alumina catalyst having a mean pore diameter of from 30 to 150 .ANG. with a standard deviation (.sigma..sub.n) of from 10 to 40 .ANG. based on statistic calculation from pore diameter and pore volume.

Preparation of propylene by dehydration of isopropanol in the presence

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Yamaguchi, Japan

Toshiyuki Isaka