二氧化锰氧化茴脑制备茴香醛的工艺研究

Preparation of Anisaldehyde from Oxidation of Anethole by Manganese Dioxide

以茴脑为原料，硬锰粉为氧化刺，在硫酸介质中制备茴香醛。考察了投料比、滴加的硫酸的质量分数、反应温度、水用量对转化率的影响，确定了最佳工艺条件：反应温度100-105℃，投料比为n（茴脑）：n（二氧化锰）：n（硫酸）1：4：4，硫酸质量分数为30％，水用量为硬锰粉质量的3倍，反应时间2．5h，转化率达99％，产品收率62．11％。在该优化条件下，将茴脑的投料量扩大10倍，转化率仍可达97．59％，产品收率61．53％。

Anisaldehyde was obtained from anethole oxidized by manganese ore in sulfuric acid solution. The effects of dosages of materials and water, mass fraction of sulfuric acid, and temperature on conversion of anethole were investigated. The optimum reaction conditions were as follows ： n （anethole） ： n（ MnO2 ） ： n（ HaSO4 ） 1 ： 4 ： 4, mass fraction of H2SO4 30 % , m （water） ： m （manganese ore）3 ： i, reaction temperature 100-105℃, reaction time 2.5 h. The conversion of anethole reached 99 % and the yield 62.11%, Under the optimal conditions, when the amount of anethole was enlarged to 10 times, the conversion of anethole was up to 97.59 % ,the yield reached 61.53 %.