problems of increase in the selectivity of ethylene oxychlorination processes: II. General patterns in the formation of chloroorganic byproducts in the ethylene oxychlorination Process

详细

We continue to consider some general patterns in the formation of chloroorganic byproducts during the process of ethylene oxychlorination in a fluidized catalyst bed. Based on the literature data, some conclusions are drawn as to chloroorganic byproducts generally resulting from the secondary conversion of 1,2-dichloroethane via the reactions of its dehydrochlorination and partial oxidation. An rise in process temperature increases the yield of byproducts. It is shown that the use of catalysts containing chlorides of alkali or alkali-earth metals along with copper chloride reduces the share from side reactions. When the process is performed under industrial conditions, it is best to use catalysts with low contents of copper on the outer surfaces of the grains. The penetration of iron into a catalyst due to the erosion of industrial reactor walls results in both a slowdown in the rate of oxychlorination and an increase in the yield of chloroorganic byproducts.