Continuous preparation of nylon with diamine recycling

Details Continuous preparation of nylon with diamine recycling Continuous preparation of nylon with diamine recycling

1984-06-14

1985-08-27

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

526 65, 526 68, C08G 6928

Patent

active

045379491

ABSTRACT:
Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.

REFERENCES:
patent: 3269990 (1966-08-01), Wiloth et al.
patent: 3296217 (1967-01-01), Tate
patent: 3900450 (1975-08-01), Jaswal et al.
patent: 3948862 (1976-04-01), Iwasyk
patent: 4019866 (1977-04-01), Jaswal et al.

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