Abstract

An analysis of the process of selective hydrogenation of acetylene in the ethane–ethylene fraction of pyrolysis gas over a palladium-containing catalyst of the KPNM-45M brand promoted by the elements from Groups I, II, and VI of the Periodic Table is performed. Spherical granules of α-Al₂O₃ with a diameter of 0.4 cm are used as the support. The concentration of palladium on the support is less than 0.05 wt %. The activation of a KPNM-45M catalyst and kinetic experiments are performed in a plug flow laboratory-scale reactor with a diameter of 2 cm with a length of the catalytic zone of 35 cm. When performing the experiments, the space velocity of the feedstock is varied from 2000 to 4000 h⁻¹, the pressure is varied from 20 to 30 atm, the temperature of the reaction medium is varied from 333 to 393 K, and the hydrogen/acetylene molar ratio is varied from 1.5 to 3. A stage mechanism of the hydrogenation reactions of acetylene and ethylene is proposed and a kinetic model corresponding to it is constructed. Overall, 80 kinetic experiments are carried out. The kinetic model parameters are estimated based on the results of the experiment by the least squares method. The region of selective hydrogenation of acetylene in the acetylene–ethylene–ethane mixtures is determined in which a gain in ethylene in the output stream of the reagents is observed during the hydrogenation reaction of acetylene. The results of the laboratory-scale kinetic experiment are confirmed on bench-scale and prototype industrial reactors.

中文翻译：

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钯纳米催化剂上乙炔烃提纯乙烯过程的建模

摘要

对元素周期表中第I，II和VI组的元素促进的KPNM-45M品牌含钯催化剂上热解气体的乙烷-乙烯馏分中乙炔的选择性加氢过程进行了分析。的α-Al的球形颗粒₂ ö ₃的直径为0.4厘米的用作支撑。载体上钯的浓度小于0.05重量％。KPNM-45M催化剂的活化和动力学实验是在直径为2 cm，催化区长度为35 cm的塞流实验室规模的反应器中进行的。在进行实验时，原料的空速在2000至4000 h ^{-1之间变化}，压力在20至30 atm之间变化，反应介质的温度在333至393 K之间变化，氢/乙炔摩尔比在1.5至3之间变化。乙炔和乙烯加氢反应的阶段机理提出并建立了与之对应的动力学模型。总体上，进行了80次动力学实验。通过最小二乘法基于实验结果估计动力学模型参数。确定了乙炔-乙烯-乙烷混合物中乙炔的选择性加氢区域，其中在乙炔的加氢反应中观察到了试剂输出流中乙烯的增加。在实验室规模和原型工业反应器上证实了实验室规模的动力学实验的结果。