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本文得到氧氯化催化剂的转化率-空速关系曲线.由高空速到低空速和由低空速到高空速所测得的曲线差异较大,在高空速下催化剂活性衰减比低空速下快得多;其根源是催化剂的成份、结构和活性随反应气氛而变化.文中建议用络合-还原氧化机理来解释有关现象.此催化剂在一定温度和原料配比下有一“最宜空速”,在此空速下HCl转化率最高,低于此空速HCl转化率不但不增高反而降低,原因是生成的二氯乙烷再裂解生成HCl.副反应由乙烯氧化生成的CO和CO_2是并联反应,它是CuCl_2催化氧化的结果.
In this paper, the conversion rate-space velocity curve of oxychlorination catalyst is obtained. The curves measured from high space velocity to low space velocity and from low space velocity to high space velocity are quite different. At high space velocity, the activity decay of catalyst is faster than that under low space velocity And its origin is that the composition, structure and activity of the catalyst vary with the reaction atmosphere.This paper suggests that the phenomenon should be explained by the complexation-reduction oxidation mechanism.The catalyst has a “optimum airspeed” at a certain temperature and raw material ratio, At this space velocity, the highest conversion rate of HCl, below which the conversion rate of not only does not increase the space velocity HCl but lower, because the generated dichloroethane and then cracked to generate HCl. Side effects of ethylene oxidation generated CO and CO_2 parallel reaction , Which is the result of catalytic oxidation of CuCl 2.