As an important chemical raw material of polyurethane industry, polyether polyol is mainly used in the manufacturing of polyurethane foam plastics, and also widely used in daily chemical, sugar making, petroleum refining, paper making and other chemical fields as emulsifier, wetting agent, dispersant, demulsifier and other production aids. The synthesis of polyethers mainly uses polyols such as propylene glycol and ethylene glycol as initiators, and undergoes ring opening polymerization reactions with organic oxides such as ethylene oxide and propylene oxide under the action of catalysts. The use of catalysts plays an important role in improving reaction efficiency. By analyzing catalyst residues in products, it can also provide important reference for monitoring the normal operation of production lines.