HF/USY分子筛催化合成2-叔丁基对甲酚

以USY负载 HF为催化剂、甲基叔丁基醚（MTBE）和对甲酚为原料，在小型固定床反应器上进行合成2-叔丁基对甲酚的研究，考察了HF负载量、反应温度、空速及原料配比对反应转化率和选择性的影响以及催化剂的稳定性。结果表明，HF改性后，USY的L酸中心增加，B酸中心减少，对甲酚转化率增大。L酸中心是烷基化反应的主要活性中心。最佳反应条件为：反应温度160 ℃，HF负载质量分数1%，空速1.2 h^-1，n(MTBE):n(对甲酚)＝1.5∶1。最佳条件下，对甲酚的转化率84.4%，2-叔丁基对甲酚的选择性98.6%。催化剂使用110 h，仍保持较好的催化活性。

Synthesis of 2-t-butyl-p-cresol over supported HF/USY catalyst

USY zeolites modified by HF were prepared and used in alkylation of p-cresol with MTBE to synthesize 2-t-butyl-p-cresol. Catalytic properties of the catalysts were studied in a micro reactor. The influences of HF loadings, reaction temperature, space velocity and MTBE/p-cresol molar ratio on p-cresol conversion and selectivity to 2-t-butyl-p cresol were investigated. The results showed that the increased conversion was attributed to the increase in L acid centers. The conversion of p-cresol and the selectivity to 2-t-butyl p-cresol were 84.4% and 98.6%, respectively, under the optimal condition as follows: hydrofluoric acid loadings 1wt%, reaction temperature 160 ℃, WHSV 1.2 h^-1, n（MTBE)∶n(p-cresol)=1.5∶1. The catalyst exhibited high activity for alkylation of p-cresol even after reaction for 110 h.