摘要 |
1,216,278. Heptenes. BRITISH PETROLEUM CO. Ltd. 6 June, 1969 [14 Aug., 1968], No. 38839/68. Heading C5E. C 7 Olefins are obtained by (a) catalytically disproportionating a mixture of butene-1 and butene-2 to yield propylene and pentene-2, and catalytically co-dimerizing the pentene-2 thus obtained with ethylene. Suitable disproportionation catalysts are Mo/Al 2 O 3 Œcobalt oxidesŒ alkali or alkaline earth metals, carbonyls of Mo, W or Re supported on Al 2 O 3 , SiO 2 or Al 2 O 3 / SiO 2 , and preferably Re 2 O 7 /Al 2 O 3 . Suitable codimerization catalysts are alkali or alkaline earth metals or hydrides, and organo-metallic alkali metal compounds and preferably Na or NaH supported on K 2 CO 3 . The feed to step (a) may be an n-butene raffinate stream, which may first be treated by (i) selective hydrogenation to remove dienes and acetylenes, e.g. over a sulphided nickel on sepiolite catalyst, and/or (ii) isomerization to increase the butene-2 content, preferably simultaneously with (i) by suitable adjustment of the reaction conditions. In the example, the C 7 -olefin fraction produced comprises 81.7% 3-ethyl-pentene-1 with small amounts of other heptenes. |