PROCEDURE FOR DE-MERCAPTANISATION OF KEROSENE FRACTIONS Russian patent published in 2011 - IPC C10G45/02 

FIELD: gas and oil production.

SUBSTANCE: invention refers to procedure of de-mercaptanisation of kerosene fractions by contacting raw stock (kerosene fraction) and hydrogen in zone of preliminary treated catalyst of hydro-fining of activity not over 50% of guaranteed nominal activity at temperature 220-240°C, pressure 0.4-1.2 MPa, volume rate of gas-raw stock supply 3.5-7 h^-1 and multiplicity hydrogen/raw stock not less, than 4:1 nm³/m³. Also, there is performed preliminary preparation of production of straight-run kerosene fraction by extraction of oil AT or AVT at installations of primary processing by means of rectification with calculated parametres of mode of operation of columns C-1 and C-2. Origin of oil raw stock, qualitative-quantitative fraction-by fraction distribution of mercaptans, straight-run benzene fractions containing maximal amount of mercaptans and a straight-run kerosene fraction are taken in consideration during calculation of the parametres. The kerosene fraction is subjected to process of de-mercaptanisation by contacting a descending flow of mixture of raw stock with hydrogen in a reactor of axial type equipped with a distributor of gas-raw stock mixture of catalyst of hydro-fining.

EFFECT: achieving content of mercaptans in kerosene fraction not over 10 ppm at maintaining initial level of total sulphur; simultaneous reduction of operational expenditures and increased flexibility of process of reactive fuel production.

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