PROCESS FOR PRODUCING PETROL WITH A LOW SULPHUR CONTENT Russian patent published in 2018 - IPC C10G45/06 C10G45/10 C10G45/36 C10G45/40 C10G65/04 C10G65/06 C10G67/02 C10G7/00 C10G69/04 

FIELD: chemistry.

SUBSTANCE: present invention relates to a process for treating petrol comprising diolefins, olefins and sulphur-containing compounds including mercaptans, in which: petrol is injected into distillation column (3) comprising at least one reaction zone (4) including at least one first catalyst comprising a support and at least one element of group VIII, the injection being carried out at a level located below reaction zone (4), so as to bring at least one fraction of the petrol into contact with the catalyst of reaction zone (4) and converting at least a portion of the mercaptans from said fraction to the sulphur-containing compounds by reaction with diolefins and obtaining desulphurised light petrol which is drawn off at the top of said distillation column (3); wherein the method further comprises the following steps: an intermediate petrol fraction is drawn off at a level located above reaction zone (4) and below the top of distillation column (3); a heavy petrol comprising the majority of the sulphur-containing compounds is drawn off at the bottom of the column, said intermediate petrol fraction is brought into contact, in demercaptanisation reactor (13), optionally in the presence of hydrogen, with a second catalyst in sulphide form, comprising a substrate, at least one element selected from group VIII, and at least one element selected from group VIB, wherein the content of the group VIII element, expressed as oxide, is between 1 and 30% of the total weight of the catalyst, the content of the group VIB element, expressed as oxide, is from 1 to 30% of the total weight of catalyst to produce a stream containing sulphides; the stream leaving the demercaptanisation reactor is returned to distillation column (3).

EFFECT: method makes it possible to obtain a light petrol fraction of with a very low sulphur content while maintaining octane number.

14 cl, 2 dwg, 3 ex