METHOD FOR PRODUCTION OF PETROLEUM FRACTIONS Russian patent published in 1999 - IPC

FIELD: petroleum processing. SUBSTANCE: fractions are produced by feeding preheated hydrogenate into feed zone of the first rectification column, into bottom of which hot jet and steam are fed. Top vapors of column are partly condensed in condenser and transferred into reflux tank, from the top of which vapors and from the bottom of which gasoline fraction are withdrawn. Hot jet is combined with hot hydrogenate and fed into feed zone of the first column. First-column side stream is fed into feed zone of the second rectification column. From the bottom of the latter, light fraction is withdrawn and top vapors are combined with those from the first column to be then condensed and collected in reflux tank. Part of gasoline fraction produced is used for refluxing the second column. EFFECT: increased yield of gasoline and reduced power consumption. 1 dwg, 1 tbl