Process for the production of polyamides from dinitriles and diamines

本发明涉及一种由二腈与二胺在连续反应中采用逐步加热的步骤制备聚酰胺的方法，具体地说，该方法包括使二腈与二胺、水和任选的催化剂接触，以形成反应混合物；将所述反应混合物加热到约180－约240℃的第一高温，保持所述温度约0.10－约20小时，和任选地在该加热步骤中通过排放控制压力；将反应混合物加热到约250－约350℃的第二高温，在达到第二高温之前或之后向反应混合物中加入水，通过排出至少一部分水使在第二加热步骤中的压力保持在大气压之上，和使第二高温保持约0.10－约10小时；并回收聚酰胺。 A process for producing polyamides from dinitriles and diamines in a continuous reaction using subsequent heating steps. In particular, the process involves contacting a dinitrile, a diamine, water, and optionally a catalyst to form a reaction mixture; heating the reaction mixture to a first elevated temperature of between about 180 to about 240° C., maintaining said temperature for about 0.10 to about 20 hours, and optionally controlling the pressure in this heating step by venting; heating the reaction mixture to a second elevated temperature of between about 250 to about 350° C., adding water to the reaction mixture before or after the second elevated temperature is reached, maintaining the pressure in the second heating step above atmospheric pressure by venting at least some of the water, and maintaining the second elevated temperature for a period of about 0.10 to about 10 hours; and recovering the polyamide.