Title:
PRODUCTION OF 1,4-DIHYDROXY-2-NAPHTHOIC ACID
Document Type and Number:
Japanese Patent JP3199618
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To readily obtain the subject compound useful as an intermediate for dyes, pigments, photographic agents, etc. in high quality and high yield.
SOLUTION: 1,4-Dihydroxynaphthalene is reacted with an alkali metal hydroxide (e.g. NaOH) under an inert gas atmosphere (e.g. nitrogen gas) in a propylene- based glycol ether (e.g. dipropylene glycol monomethyl ether) at 110-200°C to provide the alkali metal salt. Successively, carbon dioxide gas is blown into the reaction system so as to carry out carboxylation to provide the objective 1,4-dihydroxy-2-naphthoic acid. The alkali metal hydroxide is used in an amount of 1.5-3mol based on 1mol 1,4-dihydroxynaphthalene. 1,4-dihydroxynaphthalene is obtained by carrying out catalytic reduction of 1,4-naphthoquinone which is a raw material under hydrogen pressure using a catalyst (e.g. palladium carbon).
Inventors:
Kumayo Mitsugu
Toshio Nakamatsu
Toshio Nakamatsu
Application Number:
JP31720395A
Publication Date:
August 20, 2001
Filing Date:
November 09, 1995
Export Citation:
Assignee:
Sumika Finechem Co., Ltd.
International Classes:
B01J23/42; B01J23/44; B01J25/02; C07B61/00; C07C37/66; C07C37/68; C07C39/225; C07C51/15; C07C65/11; (IPC1-7): C07C51/15; C07C65/11
Domestic Patent References:
| JP5194314A |
Attorney, Agent or Firm:
Yoshinori Hosoda