Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1992-07-13
1993-12-28
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562485, 562486, 562487, 562488, C07C 5109
Patent
active
052741850
ABSTRACT:
A high purity naphthalene dicarboxylic acid (NDCA) is easily and rapidly produced by reacting a dialkylester of NDCA within a temperature range of 70.degree.-350.degree. C. in a solvent including at least one mono-carboxylic acid of R--COOH (wherein R has a total carbon number of not more than 9 and is a hydrogen atom, an alkyl group, a cycloalkyl group, a phenyl group, a moiety formed by bonding at least one group selected from an alkyl group, a cycloalkyl group, a phenyl group, an alkylene group, a cycloalkylene group and a phenylene group to a carbonyl group or an ether group, or a moiety formed by substituting a part or whole of hydrogen atoms in one group or a moiety selected from an alkyl group, a cycloalkyl group, a phenyl group and the above moiety with at least one group selected from an alkyl group, a cycloalkyl group and a phenyl group other than the above selected group, and a part or whole of hydrogen atoms in R may be substituted with halogen atom, provided that the total carbon number of R does not include a carbon number of carbonyl group) in the presence of an esterification catalyst and then subjecting the reaction product to a solid-liquid separation.
REFERENCES:
patent: 3650907 (1972-03-01), McNelis et al.
patent: 4794195 (1988-12-01), Hayashi et al.
Chemical Abstracts, vol. 102, No. 21, Entry 185547z, (1985).
Wakui Tadao
Yoshino Tadahiro
Clarke Vera C.
Dees Jos,e G.
Kawasaki Steel Corporation
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