Catalytic hydrodechlorination of chlorohydrocarbons in sodium hydroxide solutions. Part 2. Transformation of hexachloroethane and other polychloroethane

In part 1 of the article was shown to hexachloroethane (GHE) and perchlorethylene are the main products except sodium formate in the catalytic hydrodechlorination CCl4 among sodium hydroxide solutions. The mutual transformation of hexachloroethane (GHE) and perchlorethylene occur during the conduct of the process. Takes into accounts that the need for the commercial industry in perchlorethylene significantly greater than in GHE, so the consistent pattern of the catalytic hydrodechlorination of GHE and pentahloretana, 1,1,2,2-tetrachloroethane, 1,1,2-trichloroethane and 1,2-dichloroethane are studied it the paper. The catalyst is 1,5 wt.%. Pd on SIBUNIT. It is found that the percentage of substitution reactions of chlorine to hydrogen increases with decreasing the number of chlorine atoms in the molecule of poly chloroethane, reactivity of the product is lowered. Ethane and ethylene are the end products of the reaction with a sufficient contact time. kinetics of catalytic GHE hydrodechlorination Reaction is studied in the temperature range 353–393 K and hydrogen partial pressure 50–810 kPa. It is shown that perchlorethylene is the only product of the reaction, i.e. conversion of GHE is due to the cleavage reaction of two chlorine atoms, and the rate-limiting step of the process is the solubility of the product in aqueous alkaline reaction media. The form of the kinetic equation is defined w = 2,1·10–6exp[–(16200 ± ± 400)/RT]СГХЭСкатР0,5. The possibility of using of catalytic chlorohydrocarbons hydrodechlorination in the sodium hydroxide solutions for the processing ofr organochlorine wastes containing CCl4 and poly chloroethanes is proved experimentally.

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