| 摘要 |
Alkenyl aromatic halohydrocarbons are obtained by the dehydrogenation of the corresponding alkyl aromatic compound in the presence of steam and a dehydrogenation catalyst in which the temperature is gradually raised as the reactants pass through the catalyst by supplying indirect heat. The starting material may be ethylchlorobenzene, and suitable catalysts are ferric oxidepotassium oxide; magnesium oxide-ferric oxidepotassium carbonate, alumina-silica-nickel and ferric oxide-chromia-potassium oxide. 0.8-20 pounds of steam are added per pound of alkyl aromatic and the reaction temperature may be 500-700 DEG C. The depth of catalyst, which may be in a fixed or fluidised bed or tubular reactor may be 6 inch to 50 feet and the temperature in the reactor is raised by 10-100 DEG C. using coils carrying heating fluids or electrical heating coils.ALSO:Alkyl aromatic hydrocarbons are obtained by the dehydrogenation of the corresponding alkyl aromatic compound in the presence of steam and a dehydrogenation catalyst in which the temperature is gradually raised as the reactants pass through the catalyst by supplying indirect heat. Specified starting materials are ethylbenzene, isopropylbenzene, diethylbenzene and ethylnaphthalene, and suitably catalysts are ferric oxide-potassium carbonate, alumina-silica-nickel and ferric oxide-chromia-potassium oxide. 0.8-20 pounds of steam are added per pound of alkyl aromatic and the reaction temperature may be 500-700 DEG C. The depth of catalyst, which may be in a fixed or fluidized bed or tubular reactor may be 6 inches to 50 feet and the temperature in the reactor is raised by 10-100 DEG C. using coils carrying heating fluids or electrical heating coils. |
