초록 ▼

An integrated process for producing desulfurized hydroprocessed products from Fischer-Tropsch synthesis is disclosed. The process involves isolating and desulfurizing a methane-rich stream from a natural gas source in a first separation zone and a desulfurization zone. The methane-rich stream is con

An integrated process for producing desulfurized hydroprocessed products from Fischer-Tropsch synthesis is disclosed. The process involves isolating and desulfurizing a methane-rich stream from a natural gas source in a first separation zone and a desulfurization zone. The methane-rich stream is converted to syngas and subjected to a hydrocarbon synthesis step, for example, a Fischer-Tropsch synthesis step. The products from the hydrocarbon synthesis step typically include a C4- fraction, a C5-20fraction, and a C20+ wax fraction. These fractions are isolated in a second separation zone, typically via fractional distillation. The C4- fraction can be recycled through the first separation zone to provide a second methane-rich fraction for conversion to synthesis gas. The C4- fraction can optionally be treated, for example, with hydrotreatment or hydroisomerization catalysts and conditions before or after passage through the first separation zone. The hydrocarbons in the C5-20and C20+ wax fractions are subjected to additional process steps, for example, hydrotreatment, hydroisomerization, hydrocracking (particularly in the case of the wax fraction), preferably in the presence of sulfur-containing compounds. The products of the additional process steps are sent to a third separation zone, and yield one or more fractions useful, for example, in fuel-related products (preferably C5-20hydrocarbons) as well as an additional C4- fraction. The additional C4- fraction, which can include sulfur impurities resulting from the hydroconversion reaction, can also be desulfurized in the desulfurization zone along with the natural gas. This eliminates the need for a second desulfurization zone. The desulfurization zone can be scaled up from its normal size, if desired, to accommodate the additional sulfur removal resulting from the hydroconversion.

대표청구항 ▼

1. A process for providing a desulfurized hydroprocessed hydrocarbon product from Fischer-Tropsch synthesis, the process comprising; a) treating a well gas in a treatment zone and isolating a desulfurized methane-rich fraction, a sulfur rich fraction and a C3+ hydrocarbon fraction, b) converting

1. A process for providing a desulfurized hydroprocessed hydrocarbon product from Fischer-Tropsch synthesis, the process comprising; a) treating a well gas in a treatment zone and isolating a desulfurized methane-rich fraction, a sulfur rich fraction and a C3+ hydrocarbon fraction, b) converting the desulfurized methane-rich fraction to syngas, c) subjecting the syngas to hydrocarbon synthesis conditions, d) subjecting at least one C5+ liquid reaction product from the hydrocarbon synthesis to hydroconversion conditions and producing a sulfur-containing C4- fraction and an upgraded C5+ fraction, and e) treating the sulfur-containing C4- fraction in the treatment zone of step a. 2. The process of claim 1 wherein the sulfur-containing C4- fraction is combined with the well gas and the combined stream is separated to isolate the desulfurized methane-rich fraction. 3. The process of claim 1, wherein the step of isolating a desulfurized methane-rich fraction from a well gas comprises; a) combining the sulfur-containing C4- fraction and the well gas and desulfurizing the combined stream; and b) separating the desulfurized combined stream in a separation zone and isolating the desulfurized methane-rich fraction. 4. The process of claim 1, wherein the hydrocarbon synthesis conditions comprise Fischer-Tropsch synthesis conditions. 5. The process of claim 4, wherein the Fischer-Tropsch synthesis conditions favor formation of waxy products. 6. The process of claim 1, wherein the C5+ liquid reaction product of step d) to be hydroconverted is substantially a 650° F.+ product. 7. The process of claim 1, wherein the C5+ reaction product of step d) is substantially a C5-650° F. product. 8. The process of claim 1, wherein the hydroconversion conditions include one or more of hydrotreating, hydroisomerization or hydrocracking conditions. 9. The process of claim 8, wherein the hydroconversion conditions comprise hydrocracking to form a products stream comprising a C4- fraction and a C5-650° F. fraction. 10. The process of claim 1, wherein C4- fraction is isolated from the products stream and combined with the well gas for treatment in the treatment zone. 11. The process of claim 1, wherein the hydroconversion conditions include contacting the C5+ hydrocarbon products with hydrogen in the presence of a sulfided catalyst which contains at least one Group VI metal component and at least one Group VIII metal component at a temperature in the range from 300° F. to 850° F. of and a pressure in the range from 500 psia to 3500 psia. 12. A process for providing a desulfurized hydroprocessed hydrocarbon product from Fischer-Tropsch synthesis, the process comprising; a) treating a well gas in a treatment zone and isolating a desulfurized methane-rich fraction, a sulfur rich fraction and a C3+ hydrocarbon fraction, b) converting the desulfurized methane-rich fraction to syngas, c) subjecting the syngas to hydrocarbon synthesis conditions, d) subjecting at least one C5+ liquid reaction product from the hydrocarbon synthesis to hydroconversion conditions, which comprises contacting the C5+ hydrocarbon products with hydrogen in the presence of a sulfided catalyst which contains at least one Group VI metal component and at least one Group VIII metal component at a temperature in the range from 300° F. to 850° F. of and a pressure in the range from 500 psia to 3500 psia, and producing a sulfur-containing C4- fraction and an upgraded C5+ fraction, and e) desulfurizing the sulfuir-containing C4- fraction in the treatment zone of step a.