Method and system for preparing nylon 11 from bio-based castor oil

The invention discloses a method and a system for preparing nylon 11 from bio-based castor oil, the method comprises the step of preparing 11-aminoundecanoic acid through an ammonolysis reaction of 11-bromo-undecanoic acid and ammonia water, the ammonolysis reaction is continuously carried out in a group of ammonolysis reaction kettles connected in series, the number of the ammonolysis reaction kettles is 2-15, preferably 4-10, and the ammonolysis reaction kettles are connected in series. Wherein the temperature of the first ammonolysis reaction kettle is 18-20 DEG C, the pressure of the first ammonolysis reaction kettle is 0.05-0.25 MPa, the temperature of the last ammonolysis reaction kettle is 34-38 DEG C, and the pressure of the last ammonolysis reaction kettle is 0 MPa. The pressure of the next ammonolysis reaction kettle is smaller than or equal to that of the previous ammonolysis reaction kettle, and the temperature is conversely. The invention aims to at least provide a production process and a produc