The synthesis technique of SE in toxic solvent N,N-dimethylformamide used at home and abroad was replaced by the aforementioned synthesis process which is simple,low-cost and easy for industrial production.

• 该合成工艺用丙醇作溶剂取代国内外沿用N,N-二甲基甲酰胺有毒溶剂的SE合成方法,工艺简单,生产成本低,易于工业化生产。