System and method for preparing polyether amine by catalytic amination of polyether diol

A method for preparing a polyether amine by catalytic amination of a polyether diol, wherein a system for preparing the polyether amine by the catalytic amination of the polyether diol is used, and the system comprises a fixed bed reactor, an air inlet of the fixed bed reactor is communicated with a hydrogen tank;

• the fixed bed reactor is provided with a heating furnace;
• a top portion of the fixed bed reactor is provided with a feed inlet, a bottom portion is provided with a discharge outlet, the feed inlet is communicated with a multi-stage preheater, and the multi-stage preheater is connected with a raw material tank;
• and
• the method comprises:
• filling a catalyst into the fixed bed reactor;
• pressurizing the internal pressure of the fixed bed reactor to 10˜13 MPa by a hydrogen gas, and raising the temperature of the fixed bed reactor to 150˜185° C.;
• adjusting the temperature of the multi-stage preheater so that the feeding temperature of a raw material reaches 125˜135° C.;
• and simultaneously feeding a polyether diol, liquid ammonia and the hydrogen gas into the multi-stage preheater, and after mixing and preheating, introducing into the fixed bed reactor from the feed inlet of the fixed bed reactor for a continuous catalytic amination reaction, wherein the feeding flow rate of the polyether diol is adjusted to 0.2˜0.6 h−1, the feeding flow rate of the liquid ammonia is 0.3˜0.8 h−1, and the feeding flow rate of the hydrogen gas is 0.2˜0.5 h−1, a finished product after the reaction is discharged and received from the discharge outlet of the fixed bed reactor.