邻二甲苯氧化制苯酐“80克工艺”催化剂的研究

Studies on “80 g Process” Catalysts for the Oxidation of o Xylene to Phthalic Anhydride

研究了载于环状载体上的Ｖ－Ｔｉ系二段床催化剂中的活性组份二氧化钛和有关助剂银、锌、磷、锑、铷等金属氧化物对催化剂性能的影响。放大制备的高负荷上、下两段床催化剂，经单管评价表现出较好的活性和选择性。在空速３０００ｈ－１、邻二甲苯的投料质量浓度＞８０ｇ／ｍ３条件下，邻二甲苯转化率为～１００％，粗苯酐质量收率＞１０８％，苯酞质量分数＜００４％。长时间运转试验表明，该催化剂具有良好的稳定性，重复性试验也取得了满意的结果。

The V Ti coated catalysts for the production of phthalic anhydride in a two stage fixed bed reactor through gas phase catalytic oxidation of o xylene by molecular oxygen and the influence of main active ingredients (TiO 2) and co catalysts,the oxides of Ag、Zn、P、Sb and Rb,on properties of catalysts were studied.The results obtained from bench scale single tube evaluation show the catalysts have better activity and high selectivity.At a space velocity of 3000 h -1 and an o xylene concentration of 80 g/m 3,a conversion of 100%,phthalic anhydride yield of higher than 108% and phenyl phthalein content in crude phthalic anhydride of less than 0.04% have been obtained.Continued running has proved that the catalysts have good stability and repeatability.