| 摘要 |
1307554 Purifying hydrocarbons POLYMER CORP Ltd 28 Aug 1970 [8 Sept 1969] 41586/70 Heading C5E The proportion of acetylenic impurities in an olefinic hydrocarbon is reduced by selective polymerization using as catalyst a composition comprising: (a) a hydride or hydrocarbyl compound (free of Cl, Br and I) of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Zn, Cd, Hg, B or Al, and (b) a compound of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Rh, Fe, Co, Ni, Pd, Os or Pt, the compound being free of non-complexed Cl, Br and I, and the polymerization being carried out in the absence of halogenated substances other than those, if any, in the catalytic composition. The compound (a) may be a hydride, double hydride, alkyl or alkyl fluoride, and (b) may be an organic compound soluble in hydrocarbons, e.g. a salt of a carboxylic acid of 4 to 24 carbon atoms; or of acetyl-acetone. Many examples of compounds (a) and (b) are listed. Some of these catalysts will also polymerize 1 : 2-diolefines, while not polymerizing 1 : 3-diolefines or monoolefines. Contact of the hydrocarbon with the catalyst may be at 0‹ to 200‹ under pressure high enough to keep the olefinic hydrocarbon liquid, and in the substantial absence of water and of any oxygen compounds other than those, if any, in the catalyst. Separations described in the examples are of hydrocarbons having 4 or 5 carbon atoms in the molecule. The monoenes and conjugated dienes obtained are useful for the preparation of synthetic rubbers and plastics. |
