Continuous preparation of nylons

Details Continuous preparation of nylons Continuous preparation of nylons

C - Chemistry, Metallurgy

08

G

402/234

C08G 69/28 (2006.01)

Patent

CA 1216993

- 12 - Abstract of the Disclosure: 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 250-300°C under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separa- ted continuously, the vapors are rectified and the en- trained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondens- ation under superatmospheric pressure of from 1 to 10 bar and at from 250 to 300°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.

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