Inspect whether there is material in reaction kettle 3, and close all valves after inletting, then open the heating system and inlet valve and emptying valve of recovery tank to distill for dehydration.

• 检查3号反应釜是否已经进料，进料后关闭所有阀门，打开加热系统和回收罐进料阀门.；放空阀门，进行蒸馏脱水。