Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo

Yoshihiko Kuwae

Ryuzo Ueno

Hiroaki Tsuchiya

Yoshiyasu Masada

Keiji Kawata

Yasukazu Muramoto

The present invention provides a method of production of aromatic hydroxycarboxylic acids by the reaction of alkaline metal salts of phenols or naphthols with carbon dioxide, in which free phenols or free naphthols produced as by-products in the reaction system are removed from the system so as to control the content of free phenols or free naphthols at a suitable level, by which a purer objective compound can be obtained at high yield under the condition of lower temperature and shorter time.

Process for production of aromatic hydroxycarboxylic acid

A process for preparing 2-hydroxynaphthalenecarboxylic acids which comprises reacting a liquid mixture of 1 mole of an alkali .beta.-naphtholate, 0.05 to 3 moles of .beta.-naphthol, and 0.1 to 5 times the weight of the alkali .beta.-naphtholate of light oil or kerosene with carbon dioxide under a carbon dioxide pressure of not more than 15 kg/cm.sup.2.G at a temperature of at least 180.degree. C.

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Nishinomiya, Japan

Yoshihiko Kuwae