REMOVAL OF IMPURITIES IN METHOD OF PRODUCING HYDROCARBON PRODUCTS Russian patent published in 2025 - IPC C10G45/02 C10G45/58 C10G3/00 C10G65/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing hydrocarbons, particularly hydrocarbons boiling at temperature above 30 °C, such as aviation fuel, from starting material obtained from a renewable source and/or a fossil source. Described is a method of producing a hydrocarbon product, said method comprising: i) directing a feedstock originating from a renewable source to a hydrotreating step to obtain a hydrotreated main stream; wherein said hydrotreating step includes: feeding the feedstock into one or more catalytic hydrotreating units with the addition of hydrogen to produce a first hydrotreated stream, wherein said hydrotreated stream contains impurities; H₂S, NH₃, CO, CO₂ and H₂O; directing the first hydrotreated stream to a first separation step involving use of a separation unit to remove impurities; removing from said first stage of separation of overhead stream and separation of liquid hydrocarbon stream of overhead, from which the entire portion is directed as a reflux stream into said first separation unit; removing from said first stage of separation of still stream; directing at least a portion of said still stream to a dewaxing step, involving the use of one or more catalytic hydrotreating units, with the addition of hydrogen to produce said hydrotreated main stream; ii) directing the hydrotreated main stream to a second separation step to obtain said hydrocarbon product; wherein one or more catalytic hydrotreating units for producing said first hydrotreated stream, include hydrodeoxygenation (HDO) and optionally also hydrodenitrification (HDN); wherein one or more catalytic hydrotreating units at the dewaxing step to obtain said hydrotreated main stream, include hydrodewaxing (HDW) in the presence of a noble metal catalyst and optionally also hydrocracking (HCR); and additionally including: separating the overhead gas stream containing impurities from said overhead stream from the first separation step, and directing said overhead gas stream to said separator at step ii).

EFFECT: reduced content of impurities H₂S, H₂O, NH₃, CO and CO₂, which can contact with catalysts based on noble metals used at the dewaxing step.

12 cl, 2 dwg, 2 ex