3042. ----- [RUHRCHEMIE, A. G.] [Process for Obtaining Pure Olefins.] German Patent Appl. R 109,144, R 547, filed Jan. 16, 1941 (Cl. IV d-12 o). Tom Reel 39, bag 3,453, item 1.

PATENTS

3042. ----- [RUHRCHEMIE, A. G.] [Process for Obtaining Pure Olefins.] German Patent Appl. R 109,144, R 547, filed Jan. 16, 1941 (Cl. IV d-12 o). Tom Reel 39, bag 3,453, item 1.

Technical, olefinic mixture obtained by synthesis from CO and H₂ is converted into alcohol by treatment with a CO-H₂ mixture at elevated temperature and pressure. The alcohols thus obtained are subsequently dehydrogenated. Before the water-gas treatment, the olefinic mixture is fractionated so that in every fraction the highest boiling portion boils at a lower point than the lowest boiling reaction product. The dehydrogenation of the alcohols then takes place after the further reaction products and the unconverted portion are separated. Example: From an olefinic synthesis product by careful fractionation. is obtained a pure C₁₁fraction containing about 35% of olefins. This is treated with water gas at 135°-136° and 150 atm. gage in the presence of a Co catalyst. The aldehydes thus obtained are hydrogenated at 180° and 150 atm. gage H₂pressure into a mixture of dodecyl alcohol and undecane, which are in turnseparated by vacuum distillation yielding a pure alcohol. This is dehydrogenated whereby a pure olefin is obtained.