Manufacture of a highly concentrated aqueous solution of a dicar

Details Manufacture of a highly concentrated aqueous solution of a dicar Manufacture of a highly concentrated aqueous solution of a dicar

1978-06-08

1980-07-22

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

2605012, 528335, 528346, 528349, C08G 6928, C07C 5152

Patent

active

042138841

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.

REFERENCES:
patent: 2923699 (1960-02-01), Indest et al.
patent: 3185672 (1965-05-01), Clemo et al.
patent: 3476713 (1969-11-01), Dorsey
patent: 3502624 (1970-03-01), Flack et al.
patent: 3952051 (1976-04-01), Ogawa et al.
patent: 4131712 (1978-12-01), Sprauer

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