在催化合成对叔丁基苯甲酸甲酯(MPTBBA)的反应中,催化剂对设备造成损坏同时难以分离的问题会对后续处理造成一定的压力。以磺酸类离子液体为催化剂并表征了其酸性,在不同催化剂结构、反应温度以及催化剂用量和原料摩尔比的条件下研究了催化反应性能。结果表明,以催化活性较高的离子液体吡啶1,4-丁烷磺内酯硫酸氢盐为催化剂,在反应温度为140℃、n(甲醇)∶n(对叔丁基苯甲酸(PTBBA))∶n(离子液体)为1 000∶100∶1的条件下反应2.5 h,PTBBA的转化效率可达到90%。磺酸类离子液体酸性表征结果表明,催化活性与其酸量有关,酸量越高磺酸类离子液体的催化活性越高。

In the catalytic synthesis reaction of p-tert-butyl methyl benzoate (MPTBBA),the catalyst may cause damage to equipment due to common shortcomings,and is difficult to be separated,which will cause certain troubles to subsequent processing.Sulfonic acid type ionic liquid is taken as the catalyst,and its acidity is characterized.The catalytic reaction performance is studied under different catalyst structures,reaction temperatures,catalyst dosages and molar ratios between feedstocks.It is found that the conversion rate of p-tert-butylbenzoic acid (PTBBA) can reach 90% after 2.5 h of reaction by using pyridine 1,4-butane sulfolactone hydrogen sulfate ionic liquid as catalyst when reaction temperature is at 140℃,and the molar ratio of methanol,PTBBA and ionic liquid is 1 000∶100∶1.It is shown from characterization on the acidity of sulfonic acid type ionic liquid that the catalytic activity of ionic liquid is related to its amount of acid.The higher the amount of acid,the higher the catalytic activity of sulfonic acid type ionic liquid.

吴芹(1976-),女,博士,副教授,研究方向为绿色催化工艺与工程、清洁能源化工,wuqin＿bit@126.com。