TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The skeletal isomerization is carried out at 150-400 degrees C, under a pressure of 0-5 MPa and in the presence of an acidic catalyst comprising silico alumino phosphates and zeolites. In the method, after the skeletal isomerization, prehydrogenation is carried out. The prehydrogenation is carried out in the presence of a hydrogenation catalyst containing one or more Group VIII and/or VIA metals of Periodic System at 50-400 degrees C under a hydrogen pressure of 0.1-20 MPa. In the method, when the feedstock comprises fatty acid esters, the prehydrogenation is carried out in the presence of a metal catalyst at 25-30 MPa hydrogen pressure and at 200-230 degrees C. The skeletal isomerization and optional prehydrogenation forms a product which is subjected to deoxygenation, where the deoxygenation is carried out by decarboxylation/decarbonylation or hydrodeoxygenation. In the decarboxylation and/or decarbonylation, the product and optionally a solvent or a mixture of solvents are brought into contact with an heterogeneous decarboxylation/decarbonylation catalyst containing one or more Group VIII and/or VIA metals at 100-400 degrees C under a pressure from atmospheric pressure to 20 MPa of inert gas/hydrogen-mixture. In the hydrodeoxygenation, the product and optionally a solvent or a mixture of solvents are brought into contact with a hydrogenation catalyst containing metals from Group VIII and/or VIA under a pressure of 1-20 MPa and at 200-500 degrees C. Preferred Components: The feedstock comprises at least 20 wt.% (preferably at least 50 wt.%) of unsaturated fatty acids or fatty acid esters with 1-5C alcohols. The unsaturated fatty acid or fatty acid esters with 1-5C alcohols used as the feedstock have a total carbon number of 8-26. The feedstock originates from biological raw materials. In the hydrocarbon, 0-8 wt.% of water or 1-5C alcohol is added to the feedstock. The heterogeneous decarboxylation and/or decarbonylation catalyst is palladium on carbon or sulfided nickel-molybdenum on alumina. The hydrogenation catalyst is a supported palladium, platinum, nickel, nickel-molybdenum or cobalt-molybdenum catalyst and the support is alumina and/or silica. The solvent is hydrocarbon with the boiling range of 150-350 degrees C and/or recycled process streams containing hydrocarbons. EXAMPLE - Tall oil fatty acids, mordenite type zeolite (5 wt.%) and water (3 wt.%) were placed in a reactor and air was removed from the autoclave with purging nitrogen. The mixture was stirred with 300 rpm. The reaction mixture was heated to 280 degrees C and kept under nitrogen atmosphere of 1.8 MPa for 6 hours. After cooling, the zeolite was filtered off. The filtrate was distilled under reduced pressure to yield monomeric acids. The obtained monomeric acids were placed in autoclave and double bonds were hydrogenated at 150 degrees C with a catalyst containing palladium on carbon (5 wt.%) for 3 hours under hydrogen atmosphere of 2 MPa until the reaction was complete. The reaction mixture was cooled, and the catalyst was filtered off. The obtained crude branched chain fatty acids were subjected to a conventional solvent fractionation procedure to yield isomerized fatty acids. To the crude branched chain fatty acids, about 2-fold amount by weight of hexane was added and worked up to give purified isomerized fatty acids. Subsequently, in deoxygenation step, the isomerized fatty acids were hydrodeoxygenated with dried and presulfided nickel-molybdenum/aluminum trioxide catalyst to corresponding paraffin at a hydrogen pressure of 3.3 MPa and 340 degrees C to obtain branched and paraffinic hydrocarbon mixture.