| 摘要 |
1,170,871. Alkylating aromatic hydrocarbons. UNIVERSAL OIL PRODUCTS CO. 26 Feb., 1968 [2 March, 1967], No. 9123/68. Heading C5E. In a process for alkylating aromatic compounds with a molar deficiency of olefin-acting compound in a reaction zone in the presence of an unreactive vapour diluent, an improvement comprises passing the total effluent from the reaction zone into a rectified flash zone comprising a settling chamber for separation of liquid and vapour and a superposed zone for the rectification of the separated vapour, therein separating the effluent to provide a vapour phase comprising diluent and a portion of the unreacted aromatic compound and a liquid phase comprising alkylated aromatic compound and unreacted aromatic compound, separating the unreacted aromatic compound from the liquid and vapour phases and returning at least a portion of it to the reaction zone, and recovering the alkylated aromatic compound. The upflowing vapour in the rectified flash zone may be refluxed with unreacted aromatic compound, unreactive vapour diluent or a mixture thereof, or alkylated aromatic compound. The alkylation may be effected in the presence of an acid-acting catalyst, e.g. a calcined composite of hydrated phosphoric acid or a siliceous absorbent, or a complex of BF 3 with Al 2 O 3 . The aromatic hydrocarbon may be benzene, or alkylbenzene, or a multi-ring compound containing fused or unfused rings. The alkylating agent may be an olefin, cyclo-olefin, diolefin, acetylenic hydrocarbon, alcohol, ether, alkyl halide or ester. Preferred processes are the production of ethylbenzene by alkylating benzene with ethylene in the presence of ethane, and the production of cumene by alkylating benzene with propylene in the presence of propane. |
