| abstract |
The invention relates to a production process for hydrocarbon fractions, which are suitable as raw materials for obtaining protein feeds by microbial fermentation, wherein substantially reduced by a hydrogenating treatment of the starting hydrocarbon fraction, the content of heteroelement compounds and aromatic hydrocarbons and the fermentation accessible hydrocarbon content is increased. The object of the invention is achieved by hydrogenating the starting hydrocarbon fractions on fixed catalysts comprising compounds of elements of VI. and / or VIII. Subgroup of the Periodic Table of the Elements and a porous, refractory oxide component, preferably hydrogenation strong, fluoride or phosphate-containing nickel molybdenum-alumina types, in the intermediate pressure range between 4 and 10 MPa, at reaction temperatures between 330 and 450C and loads between 0.5 and 5 v / vh. When using the hydrocatalytically treated fractions as such or as mixtures in the cultivation stage, the yield of microbial biomass is significantly increased compared to the non-hydrocatalytically treated hydrocarbon fractions. |