Process for synthesis at atmospheric distillate that comprises the use of Fischer-Tropsch technology
AssigneesInstitut Francais du Petrole, ENI S.p.A., Agip Petroli S.p.A.
InventorsReynald Bonneau, Mario-Gabriele Clerici, Jean-Charles Viltard
Life of this patent
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Abstract
Production of atmospheric distillate from a hydrocarbon feedstock that comprises a stage for the formation of a gas mixture that contains hydrogen and carbon monoxide, an at least partial conversion stage of the gas mixture that is obtained so as to obtain a liquid effluent that contains hydrocarbons and a gas effluent that contains carbon dioxide, a stage for treating the gas effluent under conditions that make it possible to eliminate the carbon dioxide at least partly, a first stage of fractionation of the liquid fraction, an isomerizing hydrocracking stage in the presence of hydrogen and a second fractionation stage.
Claims17
A process for the production of atmospheric distillate from a hydrocarbon feedstock, comprising the following stages:
- a) a formation stage of a gas mixture that contains hydrogen and carbon monoxide in a ratio of about 1.7:1 to about 2.5:1, from said hydrocarbon feedstock,
- b) an at least partial conversion stage of the gas mixture that is obtained in stage a) at high temperature and pressure in the presence of a catalyst to obtain a liquid effluent that contains hydrocarbons that have at least 5 carbon atoms in their molecule and a gas effluent that contains the unconverted fraction of the gas mixture of stage a) and that contains carbon dioxide,
- c) a stage for treating the gas fraction that is obtained in stage b) so as to eliminate the carbon dioxide at least partly and to obtain a gas fraction that is low in carbon dioxide,
- d) a first fractionation stage of the liquid fraction that contains hydrocarbons and that is obtained from stage b) in which a heavy fraction FL1 that substantially contains hydrocarbons that have at least seven carbon atoms in their molecule and a light fraction FL2 that substantially contains hydrocarbons that have at most six carbon atoms in their molecule are separated,
- e) an isomerizing hydrocracking stage in which in the presence of a catalyst, at high temperature and pressure, and in the presence of hydrogen, heavy fraction FL1 that is obtained from stage d) is transformed into a fraction F2 that contains a larger amount of branched compounds than fraction FL1,
- f) a second fractionation stage, to which light fraction FL2 that is obtained from stage d) and fraction F2 that is obtained from stage e) are sent, and from which are separated a fraction that contains substantially hydrocarbons that have at most 4 carbon atoms in their molecule from final boiling point to atmospheric pressure that is lower than about 37° C., a fraction that has a final boiling point at an atmospheric pressure that is greater than about 300° C., and at least one intermediate atmospheric distillate fraction that has a boiling point of between about 5° C. and about 370° C.
Dependencies are inferred from the claim text.