| 摘要 |
Polyamides are prepared from aminonitriles and water by(1) reacting the aminonitriles with water at from 180 to 350° C. and such a pressure in the range from 30 to 120 bar that a gaseous phase is present as well as a liquid phase, in a first reaction stage,(2) expanding the reaction mixture obtained in the first reaction stage via an evaporator zone or adiabatically with removal of water and ammonia into a second reaction stage, and(3) postcondensing in the second reaction stage at from 0.1 mbar to 5 bar and from 230 to 320° C. |
