【摘要】 在开发出催化性能良好的合成MTBE沸石分子筛催化剂的基础上 ,详细考察了反应条件 :包括温度、压力、空速、醇烯比等操作条件对改性 β沸石分子筛催化剂合成MTBE反应性能的影响。结果表明 :反应条件对催化剂活性、MTBE选择性及活性稳定性都有一定影响。在一定范围内反应温度升高 ,烯烃的转化率增加、MTBE的选择性不变 ,但反应温度过高 ,MTBE的选择性和催化剂的稳定性变差 ;反应压力必须大于系统完全液化压力 ;醇烯比大于 1时 ,对选择性和稳定性的影响程度小 ,醇烯比小于 1时 ,随反应深度增加 ,MTBE选择性和催化剂的稳定性变差。为了充分利用催化剂的性能 ,有一个比较合适的操作范围 ,在最佳反应条件T =70℃、P =2 1MPa ,MeOH IB =1 1 ,WHSV =4h- 1下 ,对改性 β分子筛的催化性能进行长期考察 ,结果表明 :催化剂的各项性能的稳定性很好。更多还原

【Abstract】 WT4”BZ]The effects of reaction conditions, including temperature, operating pressure, space velocity and ratio of methanol to isobutene, on MTBE synthesis over modified-zeolite β have been extensively studied after the modified-zeolite β had been successfully developed The results show that the reaction conditions can affect the catalyst reactivity In a given range of temperature, the conversion of iC = 4 increases with reaction temperature increasing, MTBE selectivity and catalyst stability were not influenced, but when the temperature is up to 100℃, the selectivity and the stability begin to drop Reaction pressure must be higher than that of reactants kept in liquid phase completely Ratio of MeOH/iC = 4(≥1) has no effect on MTBE selectivity and catalyst stability, but if the ratio is less than 1, the selectivity and the stability will drop with reaction carrying on In order to obtain the optimum catalytic performances, the reaction should be carried out in the appropriate conditions (T=70℃, P=2 1MPa, MeOH/IB=1 1, WHSV=4h -1 ) The results shows that catalytic performances are stable duing a long time test [WT4”HZ]更多还原