湍动流化床中甲醇制烃反应的研究

Study on methanol to hydrocarbon reaction in turbulent fluidized bed reactor

以ZSM-5分子筛为催化剂活性组分,在提升管中试装置上考察了反应温度、停留时间及催化剂结焦量对湍流床中甲醇制烃反应的影响。结果表明,高温利于生产低碳烯烃而不利于生产汽油,在考察温度（360-550℃）下,甲醇几乎完全转化,低碳烯烃收率均有所增大,汽油收率明显降低;长停留时间利于生产汽油而不利于生产低碳烯烃,在考察停留时间（3.1-9.8 s）,甲醇接近完全转化,低碳烯烃收率均有所降低,汽油收率增大;结焦会降低甲醇转化率,适度结焦利于生产低碳烯烃而不利于生产汽油,在考察单位质量催化剂结焦量0-17 mg/g,乙烯、丙烯收率均增大,汽油收率有所降低。从多产低碳烯烃兼顾汽油的角度出发,最佳工艺条件为：反应温度450℃,停留时间3.7 s,单位质量催化剂结焦量3 mg/g。

The impacts of reaction temperature, residence time and coke on catalysts on the conversion of methanol to hydrocarbon in turbulent fluidized bed reactor are investigated with ZSM-5 catalyst on a riser pilot unit. The results show that high reaction temperature is favorable for producing light olefins, but unfavorable for producing gasoline. When the temperature rises from 360 ℃ to 550 ℃, the methanol conversion approaches nearly 100% , and the yields of light olefins increases obviously while the yield of gasoline declines dramatically. The long residence time is helpful to produce gasoline, but unfavorable to produce light olefins. When the residence time is extended from 3.1 s to 9.8 s, the methanol feed is almost completely converted, but the yields of light olefins decrease while the yield of gasoline increases. Coking will reduce the conversion of methanol. Proper amount of coking is favorable for the production of light olefins but adversely affects the production of gasoline. When the coke on the catalysts is 0 - 17 mg/g, the yields of ethylene and propylene rise up and the yield of gasoline goes down. To balance the production of both light olefins and gasoline, the optimum process conditions, i.e. reaction temperature, residence time and coke on catalyst are 450 ℃, 3.7 s and 3 mg/g respectively.