초록 ▼

A process for deasphalting a heavy hydrocarbon feedstock, comprising two stages of precipitation from the feedstock of an asphaltene fraction alone or, alternatively, of a resin fraction along with the asphaltene fraction, by means of a heavy solvent and a light solvent, respectively, is disclosed.

A process for deasphalting a heavy hydrocarbon feedstock, comprising two stages of precipitation from the feedstock of an asphaltene fraction alone or, alternatively, of a resin fraction along with the asphaltene fraction, by means of a heavy solvent and a light solvent, respectively, is disclosed. In accordance with the process, the heavy solvent and the light solvent both contain, in different proportions, at least one hydrocarbon having 3 carbon atoms and at least one hydrocarbon having at least 5 carbon atoms, the proportion of the hydrocarbon having 3 carbon atoms being higher in the light solvent than in the heavy solvent.

대표청구항 ▼

A process for the deasphalting of a heavy hydrocarbon feedstock containing an oil phase and an asphaltic phase, the asphaltic phase containing a light resin fraction and a heavy asphaltene fraction; the process comprising a first treatment step of mixing said feedstock with a first solvent containin

A process for the deasphalting of a heavy hydrocarbon feedstock containing an oil phase and an asphaltic phase, the asphaltic phase containing a light resin fraction and a heavy asphaltene fraction; the process comprising a first treatment step of mixing said feedstock with a first solvent containing substantially only at least one or more hydrocarbons constituting a C3 species having 3 carbon atoms and at least one or more hydrocarbons constituting a C5+species having at least 5 carbon atoms; the two species of hydrocarbons being present in the first solvent in a given proportion so as to yield as products of said first treatment step a precipitate including at least said asphaltene fraction and a supernatant including at least said oil phase, with said resin fraction being present only in one of said precipitate and said supernatant; separating said precipitate from said supernatant; a second treatment step of mixing that product of the first step which contains the resin fraction with a second solvent containing only at least one or more hydrocarbons constituting a C3 species having three carbon atoms and at least one or more hydrocarbons constituting a C5+species having at least 5 carbon atoms; the two species of hydrocarbons being present in the second solvent in a given proportion different from their proportion in the first solvent such that in the event that said second solvent is mixed with said precipitate containing said resin fraction, the second solvent has fewer C 3 species than said first solvent and in the event that said second solvent is mixed with said supernatant containing said resin fraction the second solvent has more C3 species than said first solvent; ultimately separating said solvents for recycling; the proportions of said species in said first and second solvents being such that said process yields a seperate deasphalted oil phase with a Conradson carbon value of 10 or less, a separated resin fraction, and a separate asphaltene fraction with a softening point of 150°C. or higher.