FIELD: chemical or physical processes.
SUBSTANCE: present invention relates to a method of desulphurization of cracked-naphtha containing organic sulfur compounds, including: a) supply of cracked-naphtha to rectification column, containing stilling reboiler; b) separating said cracked-naphtha into fractions to form a fraction of light naphtha and a fraction of heavy naphtha which is removed in the form of a still residue from the rectification column; c) feeding a fraction of heavy naphtha and hydrogen to a hydrodesulphurization unit containing a hydrodesulphurization catalyst to obtain an effluent stream of desulphurised heavy naphtha; wherein the method further includes: d) extracting the intermediate naphtha fraction in the form of a side stream from the distillation column at the side-line tray, located below inlet for supply of raw material and above lower outlet for fraction of heavy naphtha; e) heating said intermediate naphtha fraction at a temperature lower than that of the bottom-hole reboiler, using an intermediate reboiler provided with a heat source having a temperature which is lower than that of the still reboiler; f) recirculating heated intermediate naphtha fraction to rectification column on plate, located below the tray for side flow of the intermediate fraction of naphtha, column and above the lowest tray of the rectification column.
EFFECT: disclosed is a method of desulphurization of cracked-naphtha.
16 cl, 2 ex, 1 tbl, 2 dwg
