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 1222590

- 10 - O.Z. 0050/36564 Abstract of the Disclosure: Nylons are prepared by a con- tinuous process in which, in a precondensation 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 simul- taneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250 to 300°C, wherein the aqueous salt solution is condensed under superatmospheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

456616

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