Abstract：The catalysts and their reaction mechanism of cracking 1,1,2-trichloroethane to vinylidene chloride have been studied. Various catalysts have been prepared using fruit shell, coconut shell, coal activated carbon and graphite respectively as the carrier in a medium pressure reactor with the space velocity of raw material at of 1.04 h-1, the reaction temperature ranging in between 130-230 ℃ and the loaded alkali metal salt. Catalytic cracking effects have been investigated and evaluated by changing the catalyst carrier, carrier treatment method, loading of four kinds of active components and corresponding ammount. The results showed that coconut shell activated carbon treated with ammonia and loaded with alkali metal salts gave good catalytic activity. The best catalytic effect with 38% conversion and 37% the selectivity can be achieved by loading cesium chloride. It also demonstrated that KOH as active component has a good activity for this reaction, leading to 95% selectivity and catalystic life lasting for around 10 hours at 130 ℃. According to the result of the experiment, the catalytic cracking process appears to be the carbonation mechanism.
Li Qideng,Yuan Xiangqian,Song Hongyu et al. Study on the Catalyst of Dehydrochlorination of 1,1,2-Trichloroethane into Vinylidene Chloride[J]. 化学反应工程与工艺, 2015, 31(5): 417-422.
