| abstract |
A process for hydrotreating a hydrocarbon feedstock ( 1 ) involving the use of at least one hydrotreatment, particularly hydrodesulfurization, reactor ( 2 ) and a fractionation unit ( 3 ), which latter contains two distinct injection zones ( 4, 5 ) for the hydrocarbon feedstocks, a common zone ( 8 ) of vaporization of the light fractions and two distinct draw-off lines ( 6, 7 ) for the liquid bottoms; n the hydrocarbon feedstock ( 1 ) being subjected to a preliminary treatment either in a first hydrodesulfurization reactor ( 20 ) the operating conditions of which (P, T, LHSV) may be different from those of the hydrotreatment reactor ( 2 ), or in a sweetening apparatus or else in a sulfur trap, n the hydrocarbon feedstock being then injected into the first injection zone ( 4 ) of the fractionation unit ( 3 ), n the liquid bottoms being removed through the draw-off line ( 6 ) of the injection zone ( 4 ) and passed into a hydrotreatment reactor ( 2 ), n the effluents from said reactor ( 2 ) being injected into a second injection zone ( 5 ) of the fractionation unit ( 3 ), n the light fractions leave the common zone ( 8 ) through an evacuation line ( 11 ), and n the heavy liquid bottoms of the second injection zone ( 5 ) being removed through the corresponding draw-off line ( 7 ). Also apparatus for carrying out this process. |