| 摘要 |
<p>Aliphatic hydrocarbons and/or partially chlorinated hydrocarbons are subjected to oxidative chlorination by contacting them in a reaction zone maintained at 275 DEG to 600 DEG C., 0 to 200 p.s.i.g. with a chlorinating agent, a free-oxygen containing gas and a catalyst comprising 1 to 10% copper chloride, 0.8 to 10% alkali metal chloride and 0.5 to 10% rare earth metal chloride supported on an inert carrier having a surface area no greater than 10 square metres per gram. The hydrocarbon may be a C1 to C4 hydrocarbon in which adjacent carbon atoms are linked by 1 or 2 bonds. Examples refer to chlorination of methane, ethane, methylene chloride, a mixture of methane, methyl chloride, methylene chloride and chloroform, a mixture of ethane and 1,1,2-trichloroethane. Other feeds mentioned include the partially chlorinated C1 to C4 hydrocarbons. Unreacted hydrocarbons and undesired products may be recycled to the reaction zone; the more highly chlorinated products may serve as the chlorinating agent.ALSO:An oxychlorination catalyst comprises 1 to 10 weight % copper chloride, 0.8 to 10 weight % alkali metal chloride and 0.5 to 10 weight % rare earth metal chloride supported on an inert carrier having a surface area no greater than 10 square metres per gram. The carrier preferably has surface area of from 0.5 to 3.0 square metres per gram and pore volume from 0.2 to 0.3 ml. per gram, and may be alphaalumina. The catalyst may be prepared by impregnating the support material with a solution of the chlorides and drying the treated support by heating at 100 DEG to 300 DEG C. Examples relate to copper chloride-potassium chloridedidymium (a mixture of rare earths) chloride supported on alumina. Lithium chloride and sodium chloride are mentioned.</p> |
