Mitsui Toatsu Chemicals, Incorporated

Teruo Hirayama

Shinji Takenaka

Yukihiro Yoshikawa

Kunihiro Yamada

Hiroyuki Itoh

Katsuharu Miyata

Yoshitsugu Kono

Isao Kikuchi

Jyoji Morisaki

Tooru Hihara

Hironori Kamachi

A method for preparing an improved catalyst for use in the preparation of chlorine by the oxidization of hydrogen chloride with an oxygen-containing gas. The catalyst mainly comprises chromium oxide and can be used for a long period of time particularly under low oxygen content conditions, and the activity of the catalyst does not easily deteriorate, and in other words, the catalyst has a long life. Furthermore, there are disclosed the catalyst obtained by this preparation method, and a method for preparing chlorine from hydrogen chloride by the use of the catalyst. The method for preparing the improved catalyst comprises adding copper, an alkali metal and a rare earth metal, or adding chromium, copper, an alkali metal and a rare earth metal to a catalyst containing chromium oxide as a main component, and then calcining the catalyst at a temperature of 800.degree. C. or less.

Catalyst for preparing chlorine from hydrogen chloride

Concentration process of gaseous chlorine

Disclosed herein is a method for the stabilizing treatment of a catalyst comprising washing the catalyst with hot washing water following the preparation of the catalyst, the catalyst being composed principally of chromium oxide and used in the production of chlorine by the oxidation of hydrogen chloride with an oxygen-containing gas, thereby improving its catalytic activity and prolonging its life.

Method for stabilizing treatment of catalytic activity

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Ohmuta, Japan

Teruo Hirayama