摘要
将间接电合成苯甲醛与电还原马来酸制备丁二酸的过程有机结合,构建了一个新的成对电解体系,即在隔膜电解槽中,以纯Pb为阴极,PbO2/Pb为阳极,硫酸溶液为介质,在施加超声波的条件下,阳极氧化Ce3+为Ce4+,阴极还原马来酸生成丁二酸;同时,在槽外采用Ce4+氧化甲苯生成苯甲醛.实验结果表明,阴极和阳极电解的平均电流效率分别为92.71%和87.81%,总的电流效率高达180.52%;且Ce4+槽外氧化甲苯为苯甲醛的收率为95.78%,马来酸电还原为丁二酸的转化率为92.09%;电解的槽电压与单一电解氧化Ce3+相比降低了0.25 V.
In the electrolytic process of out-cell indirect electrosynthesis of benzaldehyde,electrolytic yield of electrooxidating Ce3＋ to Ce4＋ in an undivided electrolytic cell was lower,while in diaphragm electrolytic cell would cause a high energy consumption.Based on this,a research with a combination of indirect electrosynthesis benzaldehyde and direct electroreduction maleic acid to succinic acid was carried out,and a new paired electrosynthesis system was constructed,that was,ion membrane paired electrolysis for preparations of Ce4＋ on PbO2/Pb anode coupling with succinic acid on Pb cathode using sulfuric acid solution as medium under ultrasonic radiation,then oxidizing toluene to benzaldehyde with the Ce4＋ solution prepared in the first step.Experimental results showed that the synthesis of benzaldehyde and succinic acid by paired electrosynthesis with on-line ultrasound was feasible,and a high current efficiency could be obtained in both cathode and anode,which was 92.71% and 87.81% in average,respectively.Thus the total current efficiency was up to 180.52%.The percent conversion of maleic acid reached 92.09%,and the bath potential decreased 0.25 V.Besides,a good result was also obtained in oxidating toluene to benzaldehyde using the Ce4＋ solution with on-line ultrasound,the yield of benzaldehyde was 95.78% in average.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第1期66-70,共5页
Chemical Journal of Chinese Universities
基金
山西省自然科学基金(批准号:20041022)
山西省回国留学人员科研项目(批准号:2001-14)资助
关键词
超声电合成
成对电合成
苯甲醛
丁二酸
Sonoelectrosynthesis
Paired electrosynthesis
Benzaldehyde
Succinic acid
