氟化氢/USY分子筛催化合成对叔丁基苯酚

以USY负载HF为催化剂,以甲基叔丁基醚(MTBE)、苯酚为原料,在微型反应器上催化合成了对叔丁基苯酚。考察了HF负载量、反应温度、空速及原料配比对烷基化反应的影响及催化剂的稳定性。结果表明,HF改性后USY的L酸中心增加,B酸中心减少,苯酚转化率增大。L酸中心是烷基化反应的主要活性中心。在反应温度160℃、HF负载量1%、反应空速1.7h~(-1)、n(MTBE):n(苯酚)=1.5:1条件下,苯酚的转化率为91%,对叔丁基苯酚的选择性为79.05%。催化剂使用120h后,仍保持较好的催化活性。

SYNTHESIS OF p-tert-BUTYLPHENOL OVER SUPPORTED HYDROGEN FLUORIDE/USY CATALYST

USY molecular sieve was modified by HF and used for the alkylation of phenol with methyl tert-butyl ether (MTBE) to synthesize p-tert-butylphenol. The results showed that the increased con- version was attributed to the increase of Lewis acid centers.The optimum conditions were found as follows: content of hydrofluoric acid 1%, reaction temperature 160℃, space velocity(WHSV)1.7 h~(-1), molar ratio of MTBE to phenol 1.5:1. After 120 h, the catalyst still showed highly activity in the alkylation of phenol with MTBE.