摘要
以 5. 0 %过氧化氢为氧化剂 ,钨化合物为催化剂 ,在三辛基甲基氯化铵 (TOMAC)和双十八烷基二甲基氯化铵 (DOD- MAC)为相转移试剂的条件下 ,考察了油酸氧化制备壬二酸的催化反应活性。探讨了不同含钨催化剂、相转移试剂、以及催化剂用量对反应的影响 ,考察了催化剂体系中N与W物质的量比与反应活性的关系。结果表明 ,油酸在磷钨酸 /(5.0 %H2 O2 ) /TOMAC组成的催化体系作用下 ,控制磷钨酸用量为油酸投料质量的 2 . 0 %～ 3 .0 % ,nN∶nW =0. 6∶1,反应温度为 95～ 10 0℃ ,反应时间为 8h时 ,反应转化率为 10. 0 % ,对壬二酸的选择性达到 91 5 %。
The synthesis of azelaic acid through oxidation of ol eic acid with 50% aqueous hydrogen peroxide has been studied by using catalyst containing tungsten and phase transfer catalyst.Effects of catalysts,phase transfer catalysts,molar ratio of N to W,amount of catalyst were also discussed.Catalysis by phosphotungstic acid /(50% H 2O 2)/TOMAC was reported to occur in high conversions and selectivities under two-phase conditions.The results showed that the amount of catalyst used based on the weight of oleic acid was 2.0%～3.0%,molar ratio of N to W was 0.6∶1,reaction temperature was 95～100℃ and reaction time was 8h.Conversion of oleic acid and selectivity for azelaic acid were 100% and 91.5% respectively.
出处
《化学试剂》
CAS
CSCD
北大核心
2005年第2期65-67,108,共4页
Chemical Reagents
关键词
壬二酸
油酸
相转移试剂
磷钨酸
azelaic acid
oleic acid
phase transfer catalyst
phosphotungstic acid
