负载型钾盐催化剂用于合成苯甲醚的研究

采用固定床连续进料的反应器代替传统间歇反应釜作为评价反应器,以环境友好的碳酸二甲酯为甲基化试剂,由苯酚合成苯甲醚的反应新工艺。采用SiO2负载的钾盐类催化剂,考察了反应温度、进料空速、原料配比、活性组分负载量以及催化剂用量等对反应性能的影响。研究表明,在该负载型钾盐催化剂上苯酚的转化率均较高,且生成苯甲醚的选择性较好。尤其是在KF/SiO2催化剂上,在DMC/苯酚摩尔比为2∶1,进料空速为2 h-1,反应温度为250℃时,苯甲醚收率和选择性分别高达93.93%和98.19%。而且该负载型催化剂活性比较稳定,未发现活性组分流失,反应运行16 h催化剂未见失活。

A nove- technology for anisole synthesis using supported potassium salt catalyst

Synthesis of anisole with DMC and phenol over SiO₂ supported K₂CO₃, KBr, and KF catalyst was studied under continuous condition. Effects of the reaction conditions such as reaction temperature, reaction space velocity, ratio of reactants and catalyst loading amount, were investigated. The optimized reaction conditions were found for KF/SiO₂. The ratio of DMC to phenol is 2∶1(mol ratio), MHSV is 2h^-1 and reaction temperature is at 250℃, yield of anisole is as high as 93.93%, and anisole selectivity is high to 98.19%. And the catalyst activity was still very high after 16h of reaction. Therefore, the new reaction technology introduced in the present study is a practical environmentally benign anisole synthesis process.