| abstract |
Process for the continuous production of polyamides, in which in an evaporator zone an aqueous solution of salts of dicarboxylic acids with 6 to 18 carbon atoms and diamines with 6 to 18 carbon atoms under increased pressure with simultaneous evaporation of water and formation of a prepolymer to a temperature of 250 to 300 ° C heated. Continuously separating the prepolymer and steam, rectifying the vapors and returning the diamines carried along, leading the prepolymers into a polycondensation zone and condensing them under an overpressure of 1 to 10 bar at a temperature of 250 to 300 ° C., the aqueous salt solution being under an overpressure of 1 heated up to 10 bar within a dwell time of at most 60 seconds, with the proviso that when leaving the evaporator zone the degree of conversion is at least 93% and the water content of the prepolymer is at most 7% by weight. |