TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Feed: The feed contains less than 10 weight ppm alkaline and alkaline earth metals, calculated as alkaline and alkaline earth metals, less than 10 weight ppm other metals, calculated as metal element and less than 30 weight ppm phosphorus calculated as phosphorus element. The feed contains 1000-8000 weight ppm, preferably 2000-5000 weight ppm of sulfur calculated as sulfur element. The feed comprises less than 20 wt.% of fresh feed and additionally at least one diluting agent. The diluting agent is diluting agent is selected from hydrocarbons and/or recycled products of the process and the ratio of diluting agent and fresh feed is 5-30:1, preferably 10-30:1 and most preferably 12-25:1. The feed contains 1000-8000 weight ppm and preferably 2000-5000 weight ppm of sulfur calculated as elemental sulfur. At least one inorganic or organic sulfur compound or refinery gas and/or liquid stream containing sulfur compounds is added to the feed.Preferred Catalyst: Hydrotreatment is carried out in the presence of a hydrogenation catalyst containing a metal from group VIII and/or VIB. The hydrotreating catalyst is a supported palladium, platinum, nickel, nickel-molybdenum or cobalt-molybdenum catalyst, and the support is alumina and/or silica. An isomerization catalyst containing molecular sieve is used in the isomerization step. The isomerization catalyst comprises a metal from group VIII element, and contains alumina or silica. The isomerization catalyst contains SAPO-11 or SAPO-41 or ZSM-22 or ZSM-23 or ferrierite and platinum or palladium or nickel and alumina or silica.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Feed: The fresh feed contains triglyceride 12-16C fatty acid and/or other fatty acid ester (30-40 wt.%), and free fatty acid (5 wt.% or more). The fresh feed is of biological origin selected from plant oils/fats, animal fats/oils, fish fats/oils, fats contained in plants bred by gene manipulation, and/or recycled fats of the food industry, preferably feed of biological origin and hydrocarbon/hydrocarbons. The fresh feed is selected 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 and/or fats contained in milk.