Manufacture of a highly concentrated aqueous solution of a dicarboxylic acid diamine salt and a nylon precondensate

US4213884A · kind A · utility

Assignee

• BASF SE

Inventors

• Albrecht Eckell · Bischofswerda, DE
• Paul Matthies · Heidelberg, DE
• Georg Pilz · Neustadt, DE
• Rudi-Heinz Rotzoll · Schifferstadt, DE

Key dates

• Filing date: Jun 8, 1978
• Grant date: Jul 22, 1980
• Expiry date: Jun 8, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/412
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the manufacture of a highly concentrated aqueous solution of a salt of a dicarboxylic acid and a diamine, as well as of a nylon precondensate, by reacting an alkanedicarboxylic acid of 6 to 12 carbon atoms and a diamine of the formula NH.sub.2 RNH.sub.2, where R is alkylene of 6 to 12 carbon atoms or is ##STR1## An aqueous solution, of lower concentration, of a salt of a dicarboxylic acid and a diamine, containing an appropriate dissolved excess of the particular dicarboxylic acid, is reacted with the particular diamine in the molten state, in an equivalent amount to the dissolved dicarboxylic acid, the reaction being carried out under superatmospheric pressure and the final reaction temperature being kept at from 140.degree. to 210.degree. C. The solution obtained is used for the manufacture of a nylon.