Continuous polymerization equipment and continuous polymerization process for preparing polyamide by using diacid and diamine

A continuous polymerization equipment for preparing a polyamide by using a diacid and a diamine, comprising an evaporator, a reactive distillation column, a flash drum and a polymerizer which are sequentially connected with and in communication with each other by pipelines, wherein the reactive distillation column comprises a reboiler and a tray section located on the reboiler, the tray section comprises a plurality of trays, the number of trays of the plurality of trays in the tray section is in a range of 15 to 30, a distance between adjacent two of the plurality of trays is in a range of 400 mm to 600 mm, and a height of an overflow weir of each of the plurality of trays is in a range of 50 mm to 300 mm;

• the continuous polymerization equipment further comprises a preheating heat exchanger and a prepolymerization heat exchanger;
• one of the plurality of trays adjacent to the reboiler is sequentially connected with and in communication with the preheating heat exchanger and the prepolymerization heat exchanger through the pipelines;
• the prepolymerization heat exchanger and the reboiler are circularly connected and in communication by the pipelines, so that material is capable of sequentially entering the preheating heat exchanger, the prepolymerization heat exchanger and the reboiler through the plurality of trays, enabling continuous circulation between the prepolymerization heat exchanger and the reboiler.