METHOD OF TREATING STREAMS OF LIGHT NAPHTA HYDROCARBONS Russian patent published in 2008 - IPC C10G45/00 C10G65/02 

FIELD: chemistry.

SUBSTANCE: light cracking naphta is processed to convert mercaptans into sulphides and saturation of dienes and then later subjected to destructive hydrodesulfurisation (HDS) to convert organic sulphur compounds into hydrogen sulphide. Recombinant mercaptans, formed from reaction of hydrogen sulphide with olefins at the HDS output, usually heavier than the cracking naphta, are fractionated in a mixture with the heavy cracking naphta. The invention pertains to the method of extracting organic sulphur compounds, including mercaptans, from light cracking naphta (LCN), including the fractionated mixture, consisting of hydro-treated LCN, containing the initial quantity of organic sulphur compounds, including mercaptans, and heavy cracking naphta (HCN), with volume ratio of HCN:LCN ranging from 4:1 to 1:4, in the fractionating zone in corresponding temperature and pressure conditions for removal of fractions of still residues, containing the stated HCN and part of the organic compounds of sulphur from LCN, and light ends, containing LCN and organic compounds of sulphur in quantity less than that yielded from the fractionating zone.

EFFECT: content of olefins in LCN does not reduce considerably.

14 cl, 2 ex, 4 tbl, 2 dwg