【作者】 李文凤；

【导师】 齐欣；

【作者基本信息】 天津大学 ， 有机化学， 2006， 硕士

【摘要】 本文在常压连续固定床反应器上,以Hβ沸石为催化剂,对对甲酚与异丁烯烷基化反应规律进行了研究,探讨了Mn2+、Ni2+和Ce3+交换改性Hβ沸石对催化对甲酚与异丁烯烷基化反应催化性能的影响,并考察了在Hβ沸石催化下,反应温度、原料配比以及空速对烷基化反应的影响。实验结果表明,以不同金属Mn、Ni和Ce改性Hβ沸石可调变其酸性质及孔径,从而改变其催化活性和产物选择性,其中Mn改性后Hβ沸石催化性能最优越;以双金属Ni-Zn、Mn-Cu、Ni-Mg改性Hβ沸石,对甲酚转化率有所下降,2-叔丁基对甲酚选择性显著提高,其中Ni-Zn-Hβ沸石对对甲酚-异丁烯烷基化反应的催化活性和产物选择性最好。常压条件下,在连续固定床反应器上,以Hβ沸石为催化剂,对对甲酚与异丁烯烷基化反应的优化工艺条件为:反应温度:125℃,异丁烯/对甲酚=3:1(摩尔比),空速:2h-1。在此条件下,对甲酚转化率达到70.2%,2-叔丁基对甲酚产率达到67.3%,2-叔丁基对甲酚选择性为93.6%。以氢型及金属离子交换改性的β沸石在常压连续固定床反应器上进行对甲酚与异丁烯烷基化反应,克服了传统液体酸催化剂的缺点,降低了腐蚀和污染。该工艺具有工业价值和新颖性。更多还原

【Abstract】 The alkylation of p–cresol with isobutylene over Hβzeolites has been studied in a fixed bed reactor under normal pressure. The effect of Hβzeolite modified by ion exchange with Mn, Ni, Ce and their catalytic performance on the reaction were investigated. The influence of reaction conditions (reaction temperature, material feed ratio, space velocity) on the alkylation was evaluated.The result indicated that by using different metal modifier Mn, Ni, and Ce, the acitity and pore size of the catalysts changed, hence the activity and product selectivity of the catalysts can be changed. The Mn–Hβzeolite had better properties than the other modified catalysts.The Hβzeolite were modified by both metal Ni–Zn,Mn–Cu,Ni–Mg. The conversion of p–cresol has decreased,the selectivity of 2–tert–butylp–cresol has increased distinctly. In the three catalysts, Ni–Zn–Hβzeolite has the best catalytic performance.The process for alkylation of p–cresol with isobutylene over Hβzeolites has been optimized. The suiTable le reaction conditions are as follow: reaction temperature 125℃, isobutylene:p–cresol=3:1, WHSV 2h﹣1. Under the optimized reaction conditions, the conversion of p–cresol reached 70.2 % , the yield of 2–tert–butylp–cresol reached 67.3%, the selectivity of 2–tert–butylp–cresol was 93.6%.The research work of alkylation of p–cresol with isobutylene over Hβzeolites and modified Hβzeolite , carried out on the fixed reactor may overcome the tranditional catalysts and avoid corrosion and pollution problems. This new art has novelty and industry value.更多还原