Device for preparing polyamide, prepolymerization method and production equipment and production method of polyamide

The invention provides a prepolymerization device for preparing polyamide. The prepolymerization device comprises a tubular reactor, three or more heating jackets for heating the tubular reactor, and one or more heating medium evaporators for providing a heating medium for the heating jackets. The invention further provides a prepolymerization method and production equipment and a production method of polyamide. The heating and heat transferring efficiency of the prepolymerization device is high, temperature control is more precise, the device operates stably, maintenance and replacement are convenient, and the production cost can be effectively reduced. The production equipment and the production method for polyamide 5X specifically aim at polyamide 5X, polyamide 5X products of multiple types can be produced, and the production and application range of the polyamide 5X products can be widened.