1771. ------. [JOHNSON, E. A.] (Standard Oil Co. of Indiana). Hydrocarbons From Carbon Monoxide and Regeneration of Synthesis Catalyst. British Patent 648,317. Petroleum, vol. 14, 1951, p. 227.

Mixture of CO+H₂ is contacted with an Fe catalyst under fluidized catalyst bed conditions so that a dense turbulent suspended catalyst phase is superposed by a slight dispersed phase. The synthesis products are withdrawn from the latter, and a part of the Fe catalyst is also withdrawn as a downward moving column directly from the dense phase and introduced into an oxidizing zone through which an oxidizing gas is passed upward at such velocity as to maintain the catalyst in a dense turbulent suspended phase under oxidizing conditions. A gaseous stream is removed from the upper part of the oxidizing zone, and the catalyst is removed separately from the dense phase in this zone as a downward moving column and reduced. It can then be used for further synthesis. Oxidation is effected in the presence of free O₂ at a temperature 700º-2,000º F., and reduction in H₂ within the same temperature range. The Fe particles may be contaminated with S before oxidation.

See United States Patent 2,455,419 (abs. 1772).