Process for desulfurizing and refining hydrocarbon fraction containing large quantities of aromatic components
AssigneeJgc Corporation
InventorsHideyuki Matsumoto, Shiyouichi Bando
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Abstract
Desulfurization and refining of aromatic hydrocarbon fraction containing organic sulfur compounds by catalytic hydrotreating can be performed with a high desulfurization rate (99 wt. % or higher) and without a significant loss (1 mol % or less) of the aromatic components. The improved process is characterized by preliminary sulfurization treatment of the catalyst of Co--Mo system, Ni--Mo system or Ni--Co--Mo system using thiophenes, and hydrotreating of the aromatic hydrocarbon fraction using thus treated catalyst at a relatively high temperature.
Claims18
A process for desulfurizing hydrocarbon fractions containing organic sulfur compounds as impurities and aromatic components by hydrotreating the hydrocarbon fraction so as to convert the organic sulfur compounds to hydrogen sulfide with a catalyst selected from Co--Mo system, Ni--Mo system and Ni--Co--Mo system catalysts, and by removing thus formed hydrogen sulfide, which process is characterized in that the catalyst is subjected to preliminary sulfurization treatment with thiophenes by being contacted with hydrogen and a hydrocarbon containing the thiophenes, and that the hydrotreating is carried out at a temperature between 200.degree. and 400.degree. C.;
- wherein the sulfurization treatment is carried out at a temperature sufficiently higher than the hydrotreating, whereby the catalyst is sulfurized.
A process for desulfurizing hydrocarbon fractions containing organic sulfur compounds as impurities and aromatic components by hydrotreating the hydrocarbon fractions so as to convert the organic sulfur compounds to hydrogen sulfide with a catalyst selected from Co--Mo system, Ni--Mo system and Ni--Co--Mo system catalysts and by removing the thus formed hydrogen sulfide without affecting the aromatic compounds, which process is characterized in that the catalyst is subjected to preliminary sulfurization treatment with thiophenes by being contacted with hydrogen and a hydrocarbon containing the thiophenes so that the catalyst is sulfurized to a sulfur content of 20 to 60 wt. % of the assumed maximum sulfur content which is calculated in terms of MoS.sub.2 for Mo, Ni.sub.3 S.sub.2 for Ni, and Co.sub.9 S.sub.8 for Co, respectively, and that the hydrotreating is carried out at a temperature between 200.degree. and 400.degree. C.
A process for desulfurizing impurities of organic sulfur compounds from a fraction containing aromatic compounds, which comprises:
- (1) converting the organic sulfur compounds to hydrogen sulfide by
- (a) sulfurizing a catalyst selected from the group consisting of a Co--Mo system, Ni--Mo system and Ni--Co--Mo system with thiophenes by contacting the catalyst with hydrogen and a hydrocarbon containing the thiophenes, then
- (b) hydrotreating the fraction with the resultant catalyst at a temperature between 200 and 400.degree. C., and
- (2) removing the thus-formed hydrogen sulfide,
- wherein the sulfurization step and hydrotreating step are carried out at different reaction conditions, so that the catalyst is sulfurized during the sulfurizing step to a sulfur content of 20 to 60 wt. % of its assumed maximum, and the organic sulfur compounds are converted to hydrogen sulfide during the hydrotreating step.
Dependencies are inferred from the claim text.