02-21-2019, 09:25 PM
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#7
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The Un-Tuckian
Join Date: Apr 2007
Location: South Central...KY that is
Posts: 39,517
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Quote:
The 1,1,2,2-tetrachloroethane is then dehydrochlorinated to give trichloroethylene. This can either be accomplished with an aqueous solution of calcium hydroxide
2 Cl2CHCHCl2 + Ca(OH)2 → 2 ClCH=CCl2 + CaCl2 + 2 H2O
or in the vapor phase by heating it to 300-500 °C on a barium chloride or calcium chloride catalyst
Cl2CHCHCl2 → ClCH=CCl2 + HCl
Today, however, most trichloroethylene is produced from ethylene. First, ethylene is chlorinated over a ferric chloride catalyst to produce 1,2-dichloroethane.
CH2=CH2 + Cl2 → ClCH2CH2Cl
When heated to around 400 °C with additional chlorine, 1,2-dichloroethane is converted to trichloroethylene
ClCH2CH2Cl + 2 Cl2 → ClCH=CCl2 + 3 HCl
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