IMPROVED METHOD FOR SELECTIVE REDUCTION OF BENZENE AND LIGHT UNSATURATED COMPOUNDS CONTENT IN DIFFERENT HYDROCARBON FRACTIONS Russian patent published in 2015 - IPC C10G45/02 C10G45/44 C10G49/00 

FIELD: oil and gas industry.

SUBSTANCE: first raw stock comprises mainly hydrocarbons containing at least 4 hydrocarbon atoms and includes at least one unsaturated compound, including benzene, with the property that the above first raw stock is treated in a distillation zone, a zone of impoverishment and a zone of rectification united with a zone of hydrogenation reaction, at least partial, in regard to the zone of distillation, containing at least one catalytic layer. Hydrogenation of at least a part of unsaturated compounds comprising the first raw stock is carried out in the presence of a hydrogenation catalyst and a gas flow containing hydrogen. The first raw stock is extracted from the reaction area, at least at a level of extraction in the distillation zone. The reaction zone effluent, at least partially, is again introduced to the distillation zone, at least at the level of repeated introduction in order to ensure continuity of distillation and to receive the effluent impoverished by the unsaturated compounds in the upper part of the distillation zone, a lateral branch to the distillation zone and in the lower part of the distillation zone. The method includes treatment of at least one second raw stock comprising at least one unsaturated compound, including benzene, at least partially injected to the zone of hydrogenation reaction being external in regard to the distillation zone. At that in the second raw stock benzene content varies from 2 vol.% up to 10 vol. %.

EFFECT: reducing the content of light unsaturated compounds, especially benzene, in all fractions.

23 cl, 3 dwg, 1 tbl