Dehydrohalogenation of halogenated alkanes using rare earth...

C - Chemistry – Metallurgy – 07 – C

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C07C 17/25 (2006.01) B01J 23/10 (2006.01) B01J 23/72 (2006.01) B01J 27/10 (2006.01) B01J 27/122 (2006.01) C07C 1/30 (2006.01) C07C 17/15 (2006.01) C07C 17/152 (2006.01) C07C 17/154 (2006.01) C07C 17/156 (2006.01) C07C 17/158 (2006.01) C07C 17/38 (2006.01) C07C 21/04 (2006.01) C07C 21/067 (2006.01) C07C 21/073 (2006.01) B01J 23/83 (2006.01) B01J 35/10 (2006.01) B01J 37/03 (2006.01) B01J 37/22 (2006.01)

Patent

CA 2391938

A process for the dehydrohalogenation of halogenated alkanes involving contacting a halogenated alkane having three or more carbon atoms with a rare earth halide or rare earth oxyhalide catalyst under process conditions sufficient to prepare an alkene or halogenated alkene. The process converts low valued halogenated alkanes, which are by-products of industrial chlorination processes, into higher valued alkenes and halogenated alkenes. 1,2-Dichloropropane, for example, can be dehydrochlorinated predominantly to allyl chrloride and 1-chloropropene with little production of low value 2- chloropropene. 1,2,3-Trichloropropane can be dehydrochlorinated predominantly to 1,3-dichloropropene which is useful in soil fumigants.

L'invention concerne un procédé de déshydrohalogénation d'alcanes halogénés, qui consiste à mettre un alcane halogéné à au moins trois atomes de carbone, en contact avec un catalyseur à l'halogénure de terres rares ou à l'oxychlorure de terres rares, dans des conditions de traitement suffisantes pour qu'un alcène ou un alcène halogéné soit produit. Ledit procédé consiste à convertir les alcanes halogénés de faible valeur, qui sont des sous-produits de procédés de chloration industriels, en alcènes et en alcènes halogénés de valeur supérieure. Du 1,2-dichloropropane, par exemple, peut être déhydrochloré et transformé principalement en chlorure d'allyle et 1-chloropropène, une faible quantité de 2-chloropropène de faible valeur étant produite. Le 1,2,3-trichloropropane peut être déshydrochloré et transformé principalement en 1,3-dichloropropène, utiles dans les fumigants de sol.

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