| 摘要 |
<p>Aralkanes are produced by hydrogenolysis of alpha-aralkyl alcohols in the liquid phase in the presence of a platinum group metal catalyst at a temperature above 50 DEG C. but not above 120 DEG C. The catalyst may be in elemental or combined form, e.g. as a halide, sulphide, sulphate, phosphate or double salt, and may be supported, e.g. on silica gel, magnesium carbonate, alumina, kieselguhr, carbon, barium sulphate or asbestos. The alcohol may be derived from a process in which an olefinically unsaturated compound has been epoxidized by an alpha-aralkyl hydroperoxide which has itself been converted to the alcohol, and the aralkane product may be recycled to be converted back to the hydroperoxide. Examples describe the production of cumene, ethyl benzene, p-ethyltoluene, a -phenyl b -methylpropane, p-diisopropyl benzene and tetralin.ALSO:Propylene is epoxidized to propylene oxide by reaction, in the liquid phase and in the presence of Mo and Na naphthenates, with the hydroperoxides of cumene, ethylbenzene, p-ethyl toluene, a -phenyl-b -methyl-propane, tetralin and p-di-isopropyl-benzene. The alcohols corresponding to the hydroperoxides are recovered from the reaction mixture.ALSO:Platinum group metal catalysts which have been deactivated through use in a process whereby alpha-aralkyl alcohols are hydrogenated to the corresponding aralkanes are regenerated by a solvent wash, suitable solvents being the aralkyl alcohol or the aralkane involved in the reaction, or water, an ether, an ester, an acid, a ketone, or a different cyclic or acyclic hydrocarbon, e.g. benzene or toluene. The catalyst may be in elemental or combined form, e.g. as a halide, sulphate, sulphide, phosphate or double salt, and may be supported, e.g. on silica gel, magnesium p carbonate, alumina, kieselguhr, carbon, barium sulphate or asbestos. In Examples, a Pd/C catalyst is regenerated by washing at 150 DEG C with cumene, ethylbenzene, p-ethyltoluene, p - diisopropylbenzene, alpha - phenyl-beta-methyl-propane or tetralin.</p> |
