聚乙二醇-400/NO_(2)催化氧化丁酮制备2,3-丁二酮的研究

Synthesis of 2,3-Butanedione by Catalytic Oxidation Butanone of Polyethylene Glycol-400/NO_(2)

研究了一种以聚乙二醇-400/NO_(2)为氧化剂,自制吸收塔为反应发生器,催化氧化丁酮制备2,3-丁二酮的新方法.用红外光谱对产物的结构进行了表征,红外结果表明:合成产物为2,3-丁二酮.采用单因素法考察了反应各物质的量比、反应温度和反应时间等因素对2,3-丁二酮收率的影响,优化了合成反应条件.最佳制备实验条件为:n(聚乙二醇-400/NO_(2))∶n(丁酮)=1.3∶1、反应温度为60℃、反应时间为4 h,该条件下2,3-丁二酮的收率可达86.5%,催化剂经循环使用5次,产物2,3-丁二酮的收率并未明显降低.本研究方法可为NO_(2)的回收综合利用提供了一种新途径.

A new method of catalytic oxidation of butanone to 2,3-butanedione with polyethylene glycol-400/NO_(2)as catalyst and self-made absorption tower as reaction generator was studied.The structure of the product was characterized by infrared spectrum.The infrared results showed that the product was 2,3-butanedione.The effects of molar ratio of reactants,reaction temperature and reaction time on the yield of 2,3-butanedione were investigated by single factor method,and the reaction conditions were optimized.The optimum preparation conditions were as follows:The molar ratio n(polyethylene glycol-400/NO_(2))∶n(butanone)=1.3∶1,reaction temperature 60℃,reaction time 4 h,under these conditions,the yield of 2,3-butanedione could reach 86.5%,and the yield of 2,3-butanedione did not decrease obviously after the catalyst was recycled 5 times.This method also provides a new way for the recovery and comprehensive utilization of NO_(2).