Production of paraffinic fuels from renewable materials by a continuous hydrotreating process comprising a pre-treatment step

摘要

Production of paraffinic fuels from renewable materials by a continuous hydrotreating process comprising a pretreatment step. The present invention relates to a hydrotreating process of a filler from renewable sources, such as vegetable oils for producing paraffinic hydrocarbons, comprising a pre-treatment step by crystallization and / or precipitation and pre-hydrogenation of the charge under hydrogen, allowing the elimination of non-soluble inorganic impurities under hydrotreating conditions and better management of reaction exotherms. The total charge flow is divided into a number of different partial flows equal to the number of catalytic zones in the reactor, the different partial flows are injected into successive catalytic zones in increasing proportions to produce an effluent comprising paraffinic hydrocarbons. The effluent is subjected to a separation step, allowing to separate a gas fraction and a liquid fraction containing paraffinic hydrocarbons. At least a portion of this liquid fraction is recycled, either for the pretreatment step or for at least one catalytic zone, such that the tissue to partial flow ratio introduced in the first catalytic zone is greater than or equal to 10