Production of phthalic anhydride

Details Production of phthalic anhydride Production of phthalic anhydride

1974-01-28

1976-01-06

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603463, 2603464, 2603468, C07D30789

Patent

active

039312437

ABSTRACT:
Anhydrides of carboxylic acids, more particularly, of aromatic, naphthenic and saturated aliphatic acids having at least one pair of carboxyl groups attached to adjacent carbon atoms, can be prepared by thermal decomposition of amine salts of the acids, with removal of the amine. The amine salts may be produced by aqueous hydrolysis of the corresponding nitriles, imides, or amides in the presence of an amine, or by hydrolysis to the ammonium salts followed by conversion to the amine salt by stripping off ammonia in the presence of an amine.

REFERENCES:
patent: 2478464 (1949-08-01), Denton et al.
patent: 2499055 (1956-02-01), Cosby et al.
patent: 2657230 (1953-10-01), Rogers
patent: 3403170 (1968-09-01), Corson et al.
Houben-Weyl, Methoden Der Organischen Chemie, Stuttgart, Georg Thieme (1952) Vol. VIII Oxygen Compounds III p. 326 and 427-430.

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