3901.  WENZEL, ---, REISINGER, ---, AND MENSEL, ---. (I. G. Farbenindusrie A. G.). [Clarifying the Products of Carbon Monoxide Hydrogenation.] German Patent Appl. I 75,356, OZ 14,260, filed June 23, 1943 (Cl. IV d-23 b). TOM Reel 15, bag 3,043, item 18, frames 2,397-2,404; TOM Reel 243; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 2, 1948, chap. 102, p. 84

High-boiling portions of the products of CO+H₂ conversion are treated with solvents consisting mainly of saturated or mildly unsaturated aliphatic or cyclic hydrocarbons. Further clarification can be obtained by catalytic hydrogenation. Example: 20 Kg. of that portion of the products b. > 350° are dissolved in 35 1. of triisobutane and the solution stirred for 3 hr. at 105° with 4 kg. of Tonsil. The mixture is filtered and the filtrate freed from the solvent in vacuum. The high boiling mass remaining shows a very extensive clarification over the original distillation residue from brown to light yellow. Triisobutylene and the decahydronaphthalene are also good solvents. Treatment of the same product, after solution in decahydronaphthalene and bleaching with Tonsil, at 280° in presence of 10% by weight of a Cu-Ba-Cr catalyst under 200 atm. H₂ pressure for 2 hr. yields a virtually white product. The alcohol content is increased, obviously by the cracking hydrogenation of the esters.