Study On The Catalysts Of The Vapor Phase Catalytic Dehydrochlorination Of1,1,2-trichloroethane Into Vinylidene Chloride

As an important basic chemical raw material of polymer synthesis, vinylidene chloride (VDC) can be used to produce the poly vinylidene chloride(PVDC). The polymer is widely used in food packages and so on. Because that the people pay more attention to food safety problems over the world, the potential demand of PVDC in China is tremendous. While the traditional technique production of vinylidene chloride produces huge amount of waste water, the process of vapor phase catalytic dehydrochlorination of TCE without NaOH is almost no waste emissions. The main difficulty of the research is to choose a suitable catalyst which is performing good conversion, selectivity and stability.In this study the properties of three catalysts were investigated by evaluating the conversion and selectivity at different temperature and space velocity. The three catalysts are barium chloride, activated carbon and graphite. Research showed that the catalysts all have catalytic activity, especially the graphite showed good performance, whose selectivity is73%and conversion can reach11%. Compare the selectivity of the three kinds of catalysts, graphite>nutshell activated carbon>barium chloride. The life and deactivation conditions of the catalysts were studied, especially the graphite showed high stability, whose life is more than35h at200-300℃. That solved the problem that the life of the catalysts mentioned in the literatures is less than1h.And the additional reaction of byproduct into generate raw1,1,2-trichloroethane was also studied. The result showed that concentration of TCE in the additional product is80%at the reaction temperature of80-90℃...