Catalyst for preparing ethylene sulfite and preparation method of ethylene sulfite

The invention relates to a catalyst for preparing ethylene sulfite and a preparation method of the ethylene sulfite, the catalyst comprises alkyl borane and a nitrogen-containing organic compound, and the molar ratio of the alkyl borane to the nitrogen-containing organic compound is (0.1-0.5): 1. The preparation method of the ethylene sulfite comprises the step that ethylene oxide and sulfur dioxide are subjected to a contact reaction in the presence of the catalyst. The catalyst disclosed by the invention can be used for well catalyzing and synthesizing the ethylene sulfite, the conditions in the preparation process are easy to control, and the high-purity ethylene sulfite can be prepared at high yield. 本发明涉及一种制备亚硫酸乙烯酯的催化剂、亚硫酸乙烯酯的制备方法，该催化剂包括烃基硼烷和含氮有机化合物，所述烃基硼烷和所述含氮有机化合物的摩尔比为0.1～0.5：1。本发明亚硫酸乙烯酯的制备方法包括：在本发明所述催化剂的存在下，使环氧乙烷与二氧化硫接触反应。本发明的催化剂能够很好地催化合成亚硫酸乙烯酯，制备过程条件容易控制，能够以高的收率制备得到高纯度的亚硫酸乙烯酯。