醌类化合物催化O_2氧化醛合成羧酸

Catayhtic O_2 Oxidation of Aldehydes to Carboxylic Acids by Quinones

研究了醌类化合物催化O2氧化醛合成羧酸的催化性能,发现蒽醌的催化活性高于2,3-二氯-5,6-二氰基-1,4-苯醌、四溴对苯醌、苯醌和萘醌,反应温度以及催化剂用量对反应有重要的影响,以5%物质的量(分数)的蒽醌为催化剂,在100℃、0.3 MPa的O2条件下,反应5 h,糠醛的转化率达到26.7%。以1.25%的蒽醌为催化剂,在60℃、0.3 MPa的O2条件下,反应5 h,苯甲醛的转化率达到96%,苯甲酸的分离收率为94%。

The catalytic performance of quinones in the catalytic oxidation of aldehydes to carboxylic acids using O2 as oxidant are studied. The result shows that the catalytic activity of anthraquinone is higher than 2,3 - dichloro - 5,6 - dicyano - benzoquinone, tetrabromo - p - benzoquinone, benzoquinone or naphthaquinone. In addition, the reaction temperature and the amount of catalyst have significant influence on the reaction. Under 0.3 MPa O2, at 100℃, for 5 h,using 5% anthraquinone as catalyst,the conversion of furrural is 26.7 % ; Under 0.3 MPa O2, at 60 ℃, for 5 h, using 1.25 % anthraquinone as catalyst, the conversion of benaldehyde reaches 96%, the isolated yied of bemzouacid is 94%