在线超声Mn^(3+)非均相氧化甲苯制备苯甲醛  

Study on Heterogeneous Oxidation of Toluene to Benzaldehyde by Mn^(3+) with On-line Ultrasound

作　　者：李彦威[1] 续健[1] 梁素霞[1] 张照昱[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《广州化学》2010年第2期7-12,18,共7页Guangzhou Chemistry

基　　金：山西省自然科学基金项目(No.20041022);山西省回国留学人员科研项目(No.2001-14)

摘　　要：在一定的硫酸浓度条件下,以高锰酸钾和硫酸锰为原料,采用均相液相氧化法获得了稳定性良好的Mn3+溶液。并以此溶液为氧化剂,在超声波作用下,选择性氧化甲苯制取苯甲醛。探讨了相关因素对Mn3+溶液的稳定性和苯甲醛收率的影响。实验结果表明,在硫酸浓度为4.0 mol/L,高锰酸钾和硫酸锰物质的量比为1∶12时,可制得浓度较高、稳定性良好的Mn3+溶液;同时在反应温度60℃,硫酸浓度7.0 mol/L,甲苯与Mn3+物质的量比4∶1时,施加59 kHz和175 W的超声波,可促进甲苯的选择性氧化,获得较高收率的苯甲醛。The Mn^3＋ solution with well stability was acquired, under the condition of KMnO4 and MnS04 as material, certain concentration of H2SO4 and homogeneous oxidation. Benzaldchyde was prepared by selective oxidation of toluene with the above solution as oxidant and under ultrasound, and correlative factor on the stability of Mn^3＋ solution and the yield of benzaldehyde was discussed. Results show that the Mn^3＋ solution with high concentration and well stability was prepared when the concentration of H2SO4 was 4.0 mol/L and molar ratio of KMnO4 and MnSO4 was 1 ： 12; meanwhile selective oxidation of toluene was promoted and the yield of benzaldehyde was high when ultrasound was brought into the course with the condition of ultrasound power 175 W, ultrasonic frequency 59 kHz, reaction temperature 60℃, molar ratio of toluene and Mn^3＋ 4 ： 1 and H2SO4 7.0 mol/L.

关 键 词：Mn3+ 高锰酸钾 硫酸锰 超声波 苯甲醛 

分 类 号：O625.4[理学—有机化学]