磷钨酸镧催化合成环己酮缩1,2-丙二醇  

Synthesis of Cyclohexanone 1,2-propanediol Ketal Catalyzed Using LaPW_(12)O_(40)

作　　者：许招会[1] 廖维林[2] 涂媛鸿[2] 王甡[1] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330027 [2]江西省精细化工重点实验室,江西南昌330027

出　　处：《稀有金属》2008年第2期220-223,共4页Chinese Journal of Rare Metals

基　　金：江西师范大学青年成长基金资助项目(1341)

摘　　要：用硝酸镧对磷钨酸进行改性制备了具有Keggin结构的磷钨酸镧(LaPW12O40)催化剂,用FT-IR分析方法进行了结构表征。以环己酮和1,2-丙二醇为原料催化合成了环己酮缩1,2-丙二醇,考察了酮醇摩尔配比、催化剂用量、反应时间及催化剂的重复使用性等因素对产品收率的影响。实验表明:合成环己酮缩1,2-丙二醇的较优反应条件为:环己酮0.1mol,n(环己酮)/n(1,2-丙二醇)=1.0/1.5(mol/mol),催化剂用量为反应物料总量的0.5%,带水剂甲苯12ml,回流反应时间1.5h。上述条件下,产品收率最高可达94.4%。A new environmental Keggin catalyst, LaPW12O40 was prepared using the reaction of phosphotungstic acid （PTA） with La（NO3）3·nH2O. Its structure was characterized by FTIR. Cyclohexanone 1,2-propanediol Ketal was synthesized by cyclohexanone with 1,2-propanediol in the presence of LaPW12O40. Different factors influencing on the synthesis were discussed. The results showed that the better catalytic conditions were as following： cyclohexanone 0.1 mol, the mole ratio of Cyclohexanone with 1,2-propanediol was 1.0/1.5, the dosage of catalyst was 0.5% of the feed stock, 12 ml toluene, and reaction time 1.5 h. Under the above reaction conditions the yield of the product could reach the highest as 94.4% the highiest.

关 键 词：磷钨酸镧 环己酮缩1 2-丙二醇 KEGGIN结构 

分 类 号：TQ426.91[化学工程] TQ655