Procédé de préparation de chlorure de vinyle
Vinyl chloride is prepared by thermal decomposition of dichlorethane in the vapour phase, the decomposition being carried out in the presence of dry ash-free carbon obtained by washing active carbon firstly with 2N nitric acid at 50-75 DEG C., and then with water, and thereafter drying the carbon. T...
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Zusammenfassung: | Vinyl chloride is prepared by thermal decomposition of dichlorethane in the vapour phase, the decomposition being carried out in the presence of dry ash-free carbon obtained by washing active carbon firstly with 2N nitric acid at 50-75 DEG C., and then with water, and thereafter drying the carbon. The carbon so obtained is free from metallic salts, e.g. iron salts, which catalyse the formation of undesired by-products such as tar. In an example, 1,2-dichlorethane vapours, at a gauge pressure of 8 atm., are passed through a stainless steel tube containing ash-free active carbon heated to a temperature of 400 DEG C. The condensed reaction products are subjected to fractional distillation to separate pure vinyl chloride from untransformed dichlorethane. The latter is recycled to the pyrolysis zone. A yield of 99% of vinyl chloride is obtained with a conversion rate of 65 to 70% per pass. The pyrolysis of 1,1-dichlorethane is referred to. |
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