METHOD OF PRODUCING POLYAMIDE RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method of producing polyamide resin by which a useful polyamide resin having a high molecular weight is easily produced from a polyester resin or a waste thereof by a simple process while putting a small load onto the environment.

SOLUTION: The polyester resin is reacted with a diamine compound in a reaction zone maintained at a prescribed temperature and under a prescribed pressure by using a supercritical water or subcritical water as a reaction solvent to provide the polyamide resin, and the produced polyamide resin is recovered by rapidly discharging the produced polyamide resin from the reaction zone to a zone maintained at a temperature of≤200°C under a pressure of≤20 MPa.

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