气相氧化法制备β-甲萘醌的初步研究

Preparation of β-methyl-naphthoquione via gas phase oxidation of β-methyl-naphthelane

以β 甲基萘为原料,以V2O5为主催化剂,采用气相催化氧化法制备β 甲萘醌。通过实验来确定催化剂制备的较好条件以及最优反应条件。催化剂的最佳制备条件为:20～40目的粗孔硅胶作为载体,m(偏钒酸铵)∶m(焦硫酸钾)∶m(钨酸铵)∶m(硫酸钾)∶m(硅胶)=13∶20∶17∶37∶170,浸渍时间3h,焙烧时间5h,焙烧温度400℃。在实验较适宜的条件下,得到β 甲基萘的转化率最高可达到69%,β 甲基萘醌的选择率最高可达12%。

β-methyl-1,4-naphthoquinone was prepared by gas-phase.oxidation of β-methylnaphthalene over V_2O_5 catalyst. Favorable and optimum condition for preparation of the catalyst were determined。 The optimum conditions were as follows: 20-40 mesh macroporous silica as the carrier, m(ammonium metavanadate)∶ m(potassium pyrosulfate)∶ m(ammonium wolframate)∶ m(potassium sulfate)∶ m(silica)=13∶20∶17∶37∶170,impregnation time 3 h, calcination time 5 h, calcinations temperature 400 ℃. β-methylnaphthalene conversion of up to 69% and selectivity to β-methyl naphthoquione of up to 12% were attained under favorable experimental condition.