Method for preparing gamma-lactone by photosensitized catalysis

The invention belongs to the technical field of spices, and particularly relates to a method for preparing gamma-lactone by photosensitized catalysis. Acrylic acid or acrylic ester and normal alkanolserve as raw materials, photosensitized catalysts and auxiliaries serve as catalysts, reaction is performed under ultraviolet irradiation to generate the gamma-lactone, and rectification is performedafter reaction to obtain pure gamma-lactone. The preparation method is high in yield, and capacity can be improved and can maximally reach 89.3%. Compared with a traditional process, waste acid and wastewater are avoided, addition of peroxide radical initiators in the traditional process is avoided, and the method is safe and controllable. 本发明属于香料技术领域，具体涉及种光敏化催化制备丙位内酯的方法。本发明以丙烯酸或者丙烯酸酯与正构烷醇为原料，以光敏化催化剂和助剂为催化剂，在紫外光照射下反应生成丙位内酯，反应结束后精馏得丙位内酯纯品。本发明制备方法产率较高，有利于提高产能，最高可达89.3％；对于传统工艺，避免废酸、废水产生；避免传统工艺过氧化物自由基引发剂的加入，相对传统工艺安全可控。