The invention belongs to the field of chemical technology, in particular to a synthesis method of benzoic acid generated by oxidation under light conditions. The method of the invention includes: toluene as raw materials, 9 thiophene ketone compounds as catalyst without solvent at room temperature, air condition, under visible light irradiation reaction of 40 48 h, toluene oxidation of benzoic acid can be realized efficiently. The method can prepare benzoic acid by toluene photooxidation under room temperature and solvent free conditions, and realizes the optimization and transformation of the existing production process for preparing benzoic acid by toluene oxidation. The invention uses visible light photosensitizer as catalyst to reduce the cost. The invention can greatly reduce energy consumption, thoroughly solve the problem of polluting the environment caused by heavy metals and acetic acid solvent, and the problem of heavy metal residues in products, so as to save energy and protect environment. The method of the invention is compared with the traditional production process, and the overall power consumption, the investment of the equipment and the overall operating cost are greatly reduced.
【技术实现步骤摘要】
一种光照条件下氧化生成苯甲酸的合成方法
本专利技术属于化工
,具体涉及一种光照条件下氧化生成苯甲酸的合成方法。
技术介绍
苯甲酸为具有苯或甲醛的气味的鳞片状或针状结晶,熔点122.13℃,沸点249℃,相对密度1.2659(15/4℃),结构式为:。在100℃时迅速升华,它的蒸气有很强的刺激性,吸入后易引起咳嗽。微溶于水,易溶于乙醇、乙醚等有机溶剂。苯甲酸主要用于抗真菌及消毒防腐,用于医药、染料载体、增塑剂、香料和食品防腐剂等的生产,也用于醇酸树脂涂料的性能改进,也作为钢铁设备的防锈剂、农业化学品。苯甲酸可以用作食品、饲料、乳胶、牙膏的防腐剂。苯甲酸可以作为生产苯甲酸酯和苯二甲酸酯的中间体,苯甲酸酯和苯二甲酸酯是重要的增塑剂。目前,全球普遍采用的是甲苯热氧化法制备苯甲酸的工艺。该方法利用重金属盐钴或锰作为催化剂,在高温高压的条件下实现甲苯的氧化,并最终合成苯甲酸。然而这种方法一直存在着能耗高,污染严重等问题。随着节能环保概念的提出,传统的甲苯氧化生成苯甲酸的方法所暴露出来的具有不可持续发展性的弊端已经越来越不被人们所接受。光化学,作为一门新兴的科学,已经得到 ...
【技术保护点】
一种光照条件下氧化生成苯甲酸的合成方法,其特征在于,以甲苯为原料,9‑噻吩酮化合物为催化剂,在室温、空气条件下,在可见光照射下反应40‑48 h,即实现甲苯氧化生成苯甲酸。
【技术特征摘要】
1.一种光照条件下氧化生成苯甲酸的合成方法,其特征在于,以甲苯为原料,9-噻吩酮化合物为催化剂,在室温、空气条件下,在可见光照射下反应40-48h,即实现甲苯氧化生成苯甲酸。2.根据权利要求1所述的光照条件下氧化生成苯甲酸的合成方法,其特征在于,所述的9-噻吩酮类化合物催化剂...
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