PATENT

3899.  WENZEL, ---.  (I. G. Farbenindustried A. G.).  [Foam Reduction Agent.]  German Patent Appl. I 76,932, OZ 14,609, filed Feb. 23, 1944.  TOM Reel 23, item 15, frames 167-171; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 5, 1949, chap. 154, p. 29.

Oxygenated synthesis product obtained gy the reduction of CO with H2 to olefins and subsequently hydrogenated is used as a foam-reducing agent.  Example:  3% of a finely divided catalyst containing 30% of olefins besides saturated hydrocarbons, which was obtained by cracking the hydrocarbons from the hydrogenation of CO and which B. 75°-90°.  Then a CO:H2 mixture is allowed to react at 200 atm. and 130° until the reaction is complete and then heated under the influence of H2 at 200 atm. and 180°.  The catalyst is then filtered off, the mixture heated to 170° and the saturated hydrocarbons separated.  The fraction 175°-195° is used as a foam-reducing agent in the fermentation industry.

See abs. 1035,2763.