Production of amine salts of carboxylic acids
AssigneeThe Lummus Company
InventorsJohn E. Paustian, Abraham P. Gelbein
Life of this patent
Estimating the term…
Abstract
Amine salts of aromatic and aliphatic carboxylic acids are produced by hydrolysis of a corresponding nitrile, imide, amide or mixtures thereof in the presence of an amine, and stripping of evolved ammonia. The amine salts may be used in separation of certain isomeric acids, and are useful as intermediates in the production of the corresponding carboxylic acids and derivatives thereof, such as esters and anhydrides.
Claims17
A process for hydrolizing at least one member selected from the group consisting of the nitriles, amides and imides of benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, trimesic acid, hemimellitic acid, pyromellitic acid, prehnitic acid, mellitic acid, naphthalic acid, 1,8-naphthalene-dicarboxylic acid, 2,6-naphthalene-dicarboxylic acid, 2-, 3- and 4-biphenyl carboxylic acids, diphenic acid, 1-, 2- and 9-anthroic acids, tetrachlorophthalic acid, terephthalamic acid, 4-hydroxyisophthalic acid, phthalaldehydic acid, o-, m- and p-toluic acids, nicotinic acid, isonicotinic acid, picolinic acid, furoic acid, acetic acid, proprionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, malonic acid, succinic acid, propylmalonic acid, adipic acid, glutaric acid, 2-methylglutaric acid, mucic acid, tartaric acid, citric acid, acrylic, methacrylic acid, ethylacrylic acid, .beta.,.beta.-dimethylacrylic acid, crotonic acid, maleic acid, fumaric acid, allymalonic acid and sorbic acid, comprising:
- effecting said hydrolysis with an aqueous amine solution at a temperature of from 100.degree.F to about 500.degree.F;
- said amine being selected from the group consisting of alkyl amines, hexamethylenetetramine, pyridine, picolines, lutidines, benzyl amine and xylylamine;
- and removing evolved ammonia to produce the amine salt of the acid.
Dependencies are inferred from the claim text.