SO_4~(2-)/ZrO_2固体超强酸催化剂催化甲苯与氯化苄的苄基化反应

利用甲苯与氯化苄的苄基化反应,研究了反应温度、反应时间、甲苯与氯化苄的摩尔比、催化剂用量、搅拌转速及催化剂的焙烧温度对SO42-/ZrO2固体超强酸催化剂催化性能的影响,并通过色谱-质谱联用仪对苄基化产物的结构与组成进行分析。实验结果表明,SO42-/ZrO2固体超强酸催化剂对苯与氯化苄的苄基化反应具有良好的催化活性,适宜的反应条件为:反应温度120℃、反应时间4h、甲苯与氯化苄的摩尔比8、催化剂用量0.3g/mL、搅拌转速1 000r/m in、催化剂的焙烧温度650℃。在优化条件下,氯化苄的转化率可达到81.6%,产物的质量组成为57.7%的4-甲基二苯甲烷和42.3%的2-甲基二苯甲烷。

SO42-/ZrO2 Solid Super Acid Catalyst for Benzylation of Toluene with Benzyl Chloride

Benzylation of toluene with benzyl chloride on SO~(2-)_4/ZrO_2 solid super acid catalyst was investigated.Effects of reaction conditions,namely reaction temperature,reaction time,n(toluene) ∶n(benzyl chloride),catalyst dosage,agitating rate and calcination temperature of catalyst,on benzylation were studied.Composition and structure of reaction products were determined by means of gas chromatograph-mass spectrometer(GC-MS).SO~(2-)_4/ZrO_2 solid super acid was calcined at 650℃ and was very active in benzylation of toluene with benzyl chloride.Under optimal conditions: reaction temperature 120℃,reaction time 4h,(n(toluene)) ∶n(benzyl chloride)=8,catalyst dosage 0.3g/mL,agitating rate 1 000r/min,and calcination temperature 650℃,conversion of benzyl chloride was(81.6%,)diphenylmethane products consisted of(42.3%)(mass fraction)of 2-methyl diphenylmethane and 57.7%(mass fraction)of 4-methyl diphenylmethane.