金属卟啉催化空气氧化甲苯制取苯甲醛及苯甲醇的新工艺

在少量简单金属钴卟啉的催化下，无需外加溶剂及反应引发剂，甲苯可由空气直接选择性液相催化成为苯甲醛及苯甲醇。反应结果表明反应时间、反应温度、压力、催化剂用量及空气流量等工艺参数的变化对反应都有影响。在165℃、0．8MPa、3．4ppm及40L／h空气流量的最佳反应条件下，甲苯的转化率可以达到8．7％，同时醛醇选择性可以达到近60％。同传统空气氧化甲苯制取苯甲醛体系相比，此催化体系工艺条件简单、清洁无污染，产品质量好。研究结果表明，金属卟啉存在下的催化空气氧化甲苯制取苯甲醛及苯甲醇的反应经历了一个由金属卟啉引发的自由基反应历程。

New Process of Metailoporphyrins in Catalytic Oxidation of Toluene to Benzaldehyde and Benzyl Alcohol with Air

Toluene is selectively oxidated to benzaldehyde and benzyl alcohol with air using cobalt porphyrin as catalyst without additional solvents and reaction initiator. The result shows that reaction time, temperature, pressure, and amount of catalyst all can influence the reaction. Under the optimal condition of this system： 165℃, 0.8 MPa, 3.4 ppm of catalyst and 40 L/h air flow, the total conversion of toluene is 8.7% and the selection of benzaldehyde and benzyl alcohol is 60%. Compared with traditional toluene oxidation to benzaldehyde, this catalytic oxidation system process is simple and clean. The experimental result also shows that the process has gone a radical reaction course initiated by metalloporphyrins.