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摘要
立足于甲醇制丙烯(MTP)工业装置,设计搭建了催化剂装填量为2 t的多段冷激式固定床侧线装置。侧线反应器从工业生产装置引入反应物料,受管线和反应器散热的影响,催化剂床层温度偏低,增加电加热器做热量补偿。催化剂产物分布与反应器入口物料配比密切相关,在侧线反应器内填装与工业装置相同批次的标准催化剂(MTPROP-1)对反应器进行了标定,结果表明,2个反应器内催化剂的丙烯、氢气、低碳烷烃选择性及单周期运行寿命相当。研制的催化剂在侧线装置进行了2 600 h的长周期性能评价,丙烯选择性变化趋势与标准催化剂一致,且数据相当。催化剂经过2次再生,再生性能良好。随着催化剂运行时间的延长,晶体结构没有发生变化,催化剂酸强度和酸量逐步下降,催化剂的介孔容及外表面积也呈下降趋势。
Abstract
Based on an industrial methanol to propylene (MTP) facility,a multi-stage cold-shock fixed bed side-stream reactor loading with 2 tons of the self-developed catalyst is designed and built.Reactive materials are input into the side-stream reactor from the industrial facility.Due to the heat loss in pipelines and reactor,the temperature of catalyst bed is lower than that of the industrial facility,therefore,an electric heater is added to compensate for heat.The distribution of catalytic products is closely related to the ratio of materials at reactor inlet.The side-stream reactor is calibrated by filling the same batch of standard catalyst MTPROP-1 in side-stream reactor and industrial reactor.It is shown that the selectivity of propylene,hydrogen and low-carbon olefins over the standard catalysts exhibits almost the same in the two reactors.The long-term performance of the developed catalyst has been evaluated in the side-stream reactor for 2,600 hours,showing that the change trend of propylene selectivity is consistent with the standard catalyst,and the data are comparable.The developed catalyst in side-stream reactor has good regeneration performance after two cycles of regeneration.With the extension of service time,the crystal structure of the developed catalyst remains unchanged,both its acid strength and acid quantity decrease gradually,and its mesoporous volume and surface area also decrease.
关键词
侧线装置
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丙烯选择性
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性能评价
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甲醇制丙烯
Key words
side-stream device
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selectivity of propylene
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performance evaluation
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methanol to propylene
甲醇制丙烯催化剂侧线装置性能评价[J].
现代化工, 2020, 40(6): 222-226 DOI:10.16606/j.cnki.issn0253-4320.2020.06.046