Method for reusing heavy end by-products in the manufacture...

C - Chemistry – Metallurgy – 07 – C

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C07C 17/02 (2006.01) C07C 17/04 (2006.01) C07C 17/093 (2006.01) C07C 17/35 (2006.01)

Patent

CA 2535640

A method for recovering much of the carbon and chlorine value in the heavy ends and other undesired by-products formed during the production of a C3 or higher polychlorinated alkane through the reaction of carbon tetrachloride with an olefine or chlorinated olefine, the improvement comprising the step of first separating the heavy ends and any other higher or lower boiling chlorohydrocarbon impurities from most of the desired product, and subjecting the separated heavy ends and impurities therewith to a high temperature exhaustive chlorination to produce carbon tetrachloride, tetrachloroethene, and minor amounts of hexachlorobutadiene and hexachlorobenzene by-products.

L'invention concerne un procédé permettant de récupérer une grande partie du carbone et du chlore de fractions lourdes et d'autres sous-produits indésirables formés pendant la production d'un alcane polychloré C¿3? ou supérieur, par la mise en réaction de tétrachlorure de carbone avec une oléfine ou une oléfine chlorée. Ce procédé amélioré comporte les étapes consistant à: séparer d'abord de la majeure partie du produit voulu les fractions lourdes et les autres impuretés chlorohydrocarbonées à point d'ébullition supérieur ou inférieur; et soumettre les fractions lourdes et les impuretés séparées à une chloruration complète à haute température pour former du tétrachlorure de carbone, du tétrachloroéthène et des quantités mineures de sous-produits d'hexachlorobutadiène et d'hexachlorobenzène.

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