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Title:
PRODUCTION OF TETRACHLORO-1,4-BENZOQUINONE
Document Type and Number:
Japanese Patent JPH07206755
Kind Code:
A
Abstract:

PURPOSE: To produce tetrachloro-1,4-benzoquinone of high purity by allowing chlorine and conc. hydrochloric acid to act on hydroquinone.

CONSTITUTION: A part of hydroquinone to be used is introduced into preliminarily charged 20-37% aq. hydrochloric acid containing a catalytic amt. of iron (III) ions and an anionic dispersant in a molar amt. of 4-6 times on the basis of the total amt. of hydroquinone and chlorine gas is introduced into this soln. at 20-90°C in a molar amt. of 1.5-2.0 times on the basis of the total hydroquinone and, subsequently, the residual amt. of hydroquinone is added in a solid form or a dissolved form and chlorine gas is introduced in a molar amt. of 1.5-2.0 times and, at this time, water is added to hold the concn. of hydrochloric acid to 23-25% and, finally, chlorine gas is further introduced in a molar amt. of 1.7-2.5 times and the concn. of hydrochloric acid is diluted to 20-22% with water to raise temp. to 100-107°C.


Inventors:
Arndt, Otto
Schubert, Dr. Hans
Application Number:
JP1994000258462
Publication Date:
August 08, 1995
Filing Date:
October 24, 1994
Export Citation:
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Assignee:
HOECHST AG
International Classes:
B01J27/128; C07B61/00; C07C46/00; C07C46/06; C07C46/10; C07C50/24; C10M131/10; (IPC1-7): C07C50/24; B01J27/128; C07C46/00
Attorney, Agent or Firm:
江崎 光史 (外3名)