1264. ------. [I. G. FARBENINDUSTRIE A. G.] Hydrocarbons. British Patent 468,434, June 29, 1937. Chem. Abs., vol. 32. 1938. p. 586.

Return to Abstracts of Patents 1250-1499

Patent Abstracts

Catalytic conversion of CO and H₂ into hydrocarbons and their O derivatives is effected in a liquid medium consisting of oils obtained in a previous conversion under the same or similar conditions and containing at least 1%, usually 10-100%, of constituents that boil within the benzine range, which are vaporized under the prevailing conditions of temperature and pressure. The said medium may be prepared by leading the reaction products through a cooling zone; for example, a reflux condenser, so that the vapors are wholly or in part condensed and returned to the reaction zone. A foreign oil may be used for the commencement of the conversion, being gradually replaced by freshly formed reaction product. The invention includes working not only in liquid phase but in that state above the critical temperature of any or all the constituents of the medium in which the densities in the gaseous and liquid states show no appreciable difference. Temperatures may be 200°-420° and pressures >10. such as 50-250 atm. Lower pressures; that is 1 atm., may be used. Among examples Fe powder, obtained by the decomposition of Fe carbonyl, is mixed with Si powder, TiO₂, KMnO₄, and H₂O and fused in a stream of O₂, whereby it is oxidized to FE₂O₄, the melt is cooled, comminuted, and treated with H₂ at 650°: this catalyst is arranged in layers in a tube, which is filled to above the top layer with an oil b. 65°-160°, a H₂O cooled reflux condenser at the upper end of the reaction zone, and a compensating vessel being provided: a CO-H₂ mixture is led upward into the tube in which the pressure is 100 atm. and temperature 360°-380°, the liquid products consisting of a hydrocarbon oil mainly h. 40°-300°: the gases leaving the tube contain paraffins and olefins.

See also French Patent 48,876 (abs. 1279).