EP0436379A2
Expired / Lapsed
EP
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A process for preparation of an aromatic carboxylic acid
Assignee: Kolon Industries Inc
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Filing: 1990-12-24
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Granted: —
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Expires: 2010-12-24
Abstract
Abstract The invention relates to a process for the preparation of an aromatic carboxylic acid or a derivative thereof, characterised by dissolving a derivative of a hydroxylated aromatic compound in an organic solvent, especially ethylenegylcol monoethyl ether, 3-methoxy-1-butanol or 1-methoxy-2-propanol, or mixtures thereof, in the presence pf CO₂ or a source of CO₂ in an autoclave and optionally neutralising the derivative of the carboxylic acid. The derivatives are preferably alkaline salts.
Inventors
- 👤 Tae Keun Choi
- 👤 Ho Jin Park
- 👤 Ha Won Kim
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:18
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/01; C07C65/03; C07C51/00; C07C51/15; C07C65/105; C07C65/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A process for the preparation of an aromatic carboxylic acid or a derivative thereof, characterized by dissolving a derivative of a hydroxylated aromatic compound in organic solvent chosen from those represented by formula (I) or (II) or mixtures thereof in the presence of CO₂ or a source of CO₂ in an autoclave: wherein, R is an alkyl group having tone to 4 carbon atoms. X is -O-, -NH-,-S-, or Y is -OH-, -NH₂ or and n is an integer from 1 to 4, m is an integer from 0 to 3.
Claim 2
Dependent Claim
20 words
A process according to claim 1, wherein the organic solvent is chosen from ethyleneglycol monom ethyl ether, 3-methoxy-1-butanol or 1-methoxy-2-propanol.
Claim 3
Dependent Claim
24 words
A process according to claims 1 or 2, wherein the derivatives of hydroxylated aromatic compound is chosen from derivatives of phenol, resorcinol or naphthol.
Claim 4
Dependent Claim
25 words
A process according to any preceding claim wherein the derivative of the hydroxylated organic compound and of the aromatic carboxylic acid is an alkaline salt.
Claim 5
Dependent Claim
23 words
A process according to claim 4 in which the salt of the aromatic carboxylic acid is neutralized to give the aromatic carboxylic acid.
Claim 6
Dependent Claim
113 words
A process for the preparation of an aromatic carboxylic acid, characterized in that it comprises the steps of (i) reacting an alkali salt of a hydroxylated aromatic compound in an organic solvent chosen from those represented by formula (I) or (II) or mixtures thereof in an autoclave wherein, R is an alkyl group having one to 4 carbon atoms, X is -O-, -NH-, -S-, or Y is -OH-, -NH₂or and n is an integer from 1 to 4, m is an integer from 0 to 3. to form an alkali salt of an aromatic carboxylic acid, and (ii) neutralising the alkali salt of the aromatic carboxylic acid to obtain the aromatic carboxylic acid.
Claim 7
Dependent Claim
34 words
A process according to claim 6 in which the alkali salt of the hydroxylated aromatic compound is formed in the organic solvent from the hydroxylated aromatic compound and a salt of an alkali metal.
References Cited (Backward Citations)
No citation records indexed.
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