COMBINED PROCESSING OF DIESEL FUEL AND VEGETABLE OIL TO OBTAIN LOW CLOUDING POINT HYBRID DIESEL BIOFUEL Russian patent published in 2013 - IPC C10L1/18 C10G47/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a hybrid diesel fuel product, involving steps of combining vegetable oil with diesel fuel to form a first mixture, wherein the vegetable oil comprises not more than 10 wt % of said first mixture; hydrotreating the first mixture to yield a hydrotreated second mixture containing deoxygenated triglyceride components, wherein at least 95 at % of the sulphur present in the first mixture is converted to H₂S in the second mixture; isomerising the hydrotreated second mixture at a separate second step in the presence of an isomerisation catalyst to yield a third mixture comprising hybrid diesel fuel having clouding point that is lower than that of the second mixture, wherein H₂S and NH₃ in the second mixture have not been removed prior to isomerising the second mixture at the second step and the entire stream coming from the first step is fed to the second step; and isolating the hybrid diesel fuel from the third mixture to yield a hybrid diesel fuel product. The invention also relates to a system for producing a hybrid diesel fuel product.

EFFECT: interstage removal of H₂S and NH₃ is not required between the stages of hydrotreating and isomerising, forming a low clouding point hybrid diesel fuel product, high efficiency of combined processing while reducing total production costs.

22 cl, 2 dwg, 1 tbl, 1 ex