HY分子筛催化甲苯与叔丁醇烷基化的研究

Study on Alkylation of Toluene with Tert-butylalcohoi over HY Zeolite Catalyst

采用HY分子筛催化剂进行甲苯与叔丁醇的烷基化反应,开展了催化剂制备、红外酸性表征及反应条件研究。研究结果表明,催化剂较佳的分子筛含量为60%,适宜的催化剂焙烧温度为550℃;较佳的烷基化条件为反应温度200℃、时间4h、压力1.0MPa、甲苯与叔丁醇摩尔比6、空速4h-1,甲苯转化率达到33.97%,反应产物主要是对叔丁基甲苯;催化剂B酸中心对烷基化催化性能影响显著,随着催化剂B酸量/L酸量比值的增大,甲苯转化率和对叔丁基甲苯选择性均呈现增大的变化趋势。失活催化剂经过洗涤再生,其活性得到部分恢复。

Alkylation of toluene with ten-butylalco hot is investigated over HY zcolite catalyst. The prcpara lion,the characterization by FT-IK. and the influences conditions on the catalyst performances are discussed. The results showed that the main product is the para-tert-butyltoluen(PTBT)and the toluene conversion of 33.97% can be obtained under the conditions of the catalyst calcination temperature of 550℃,the reaction temperature of 200℃,reaction time of 4 h,the pressure of 1.OMPa,the molar ratio of toluene to tert-butylalcohol of 6 and the volume space velocity of 4.0h-1.The Brsted acid sites played a key role in the reaction. The toluene conversion and PTBT selectivity ihowed increasing trends with increasing the ratio of Brsted acid sites to Lewis acid sites. The deactivated catalyst can be partly regenerated through acetone washing.