Process for preparing para-hydroxybenzoic acid

Details Process for preparing para-hydroxybenzoic acid Process for preparing para-hydroxybenzoic acid

1989-12-11

1992-06-23

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5115

Patent

active

051244772

ABSTRACT:
The improved process for preparing para-hydroxybenzoic acid comprises reacting potassium phenol with carbon dioxide in an inert reaction medium or without using a reaction medium in the presence of at least one compound selected from the group consisting of the compounds represented by the following general formula I or II: ##STR1## at a reaction temperature of 230.degree.-450.degree. C. and at a carbon dioxide pressure ranging from atmospheric pressure to 6 kg/cm.sup.2 (G). The process may comprise two stages and the first-stage reaction described above is followed by the second stage in which the reaction is further continued with the pressure of carbon dioxide in the system being reduced and/or the reaction temperature being elevated within the range specified above.
Also, phenol may be used as the starting material instead of potassium phenolate.

REFERENCES:
patent: 4032555 (1977-06-01), Bottaccio et al.
patent: 4034006 (1977-07-01), Lind et al.
patent: 4508920 (1985-04-01), Stopp et al.
patent: 4529817 (1985-07-01), Stopp et al.
European Search Report for Appln. No. 89123037.7.
Patent Abstracts of Japan, vol. 10, No. 303 (C-378) [2359], Oct. 16, 1986.

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