| 摘要 |
1,243,925. Diolefins. AMERIPOL Inc. 18 Dec., 1969, No.61700/69. Heading C5E. Olefins are dehydrogenated to diolefins by contact with a calcium nickel phosphate catalyst in the additional presence of a compound capable of forming sulphides with nickel and having the formula (A) m -S-(D) n in which A and D are each H, 0, or C 1-20 alkyl or aryl, and m and n are each 1 or 2. The added compound is said to reduce the formation and effects of carbon mounds. Suitable compounds are H 2 S, S0 2 , alkyi or aryl mercaptans, organosulphides, organosulphoxides and organosulphones. The compound may be added continuously or intermittently, and either directly to the reaction zone, or to the olefin feed, or to the diluent steam which is preferably used, and in the case of a cyclic process with a catalyst regneration phase may be added to the reaction zone only during the regeneration phase. Examples 3 and 4 describe the dehydrogenation of butenes in the presence of H 2 S or n-butyl mercaptan, Examples 1 and 2 being comparative processes without the added compound. |
