TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Conditions: The hydrotreating step is carried out at reaction temperature of 250-350degreesC, preferably 280-340degreesC and at reaction pressure of 20-150 bar, preferably 30-100 bar. The isomerization step is carried out under pressure of 2-15 MPa, preferably 3-10 MPa and at temperature of 200-500degreesC, preferably 280-400degreesC.Preferred Composition: The feed contains 10 weight ppm of alkaline and alkaline earth metals, calculated as elemental alkaline and alkaline earth metals, less than 10 weight ppm of other metals, calculated as elemental metals, and less than 30 weight ppm of phosphorus, calculated as elemental phosphorus. The ratio of diluting agent to fresh feed is 10-30:1, preferably 12-25:1. The feed contains 50-20000 weight ppm of sulfur, calculated as elemental sulfur. The hydrotreating step is carried out in presence of hydrogenation catalyst containing metal of group (VIII) and/or group (VIB). The hydrotreating catalyst is a supported palladium, platinum, nickel, nickel-molybdenum or cobalt-molybdenum catalyst. The support is alumina and/or silica. The isomerization catalyst contains a metal of group (VIII) element. The isomerization catalyst contains alumina or silica, SAPO-11 or SAPO-41, ZSM-22 or SZM-23, ferrierite, and platinum or palladium or nickel and alumina or silica.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The feed contains free fatty acid (more than 10 wt.%). The diluting agent is chosen from hydrocarbons and recycled product. The fresh feed is of biological origin, chosen from plant oils/fats, animal fats/oils, fish fats/oils, fats contained in plants bred by means of gene manipulation and/or recycled fats of food industry. The fresh feed is chosen from rapeseed oil, colza oil, canola oil, tall oil, sunflower oil, soybean oil, hempseed oil, olive oil, linseed oil, mustard oil, palm oil, peanut oil, castor oil, coconut oil, lard, tallow, train oil or fats contained in milk. The mixture of feed of biological origin and hydrocarbon is used as fresh feed.