Co-processing diesel fuel with vegetable oil to generate a low cloud point hybrid diesel biofuel

a technology of hybrid diesel and diesel fuel, which is applied in the field of diesel fuel, can solve the problems of poor low-temperature properties of conventional ester-based biodiesel, and achieve the effect of reducing the cost of production

Inactive Publication Date: 2010-04-08
CHEVROU USA INC
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Typically, such methods and systems work to provide a hybrid diesel product that benefits from a (partial) ...

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  • Co-processing diesel fuel with vegetable oil to generate a low cloud point hybrid diesel biofuel
  • Co-processing diesel fuel with vegetable oil to generate a low cloud point hybrid diesel biofuel
  • Co-processing diesel fuel with vegetable oil to generate a low cloud point hybrid diesel biofuel

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[0057]This Example serves to illustrate an exemplary system for implementing a method embodiment of the present invention, so as to produce a hybrid diesel biofuel.

[0058]Using for isomerization a catalyst of Pt on SM-7, a 95 / 5 diesel / canola oil mixture, having approximately 500 ppm sulfur (S), was hydroprocessed (hydrodesulfurization, HDS) in a hydrotreating unit to yield a hybrid diesel intermediate. Note that, upon hydrotreating, diesel processed Without canola oil is much reduced in sulfur content (below 6 ppm), but has a relatively high cloud point (i.e., −7° C.; see Table 1, vide infra). With canola oil added, this hybrid diesel intermediate mixture was processed in an isomerization unit employing an ISODEWAXING (IDW) catalyst (Pt on SM-7) to yield a hybrid diesel product having a relatively low cloud point (−13° C.). This lower cloud point allows the diesel to be used in colder climates. No interstage removal of H2S and NH3 was required, with the total effluent from the first ...

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Abstract

The foregoing describes methods and systems for co-processing vegetable oil and petroleum diesel to yield a hybrid diesel biofuel composition. As previously stated, in some embodiments the present invention is directed to methods/systems by/with which a mixture of vegetable oil and petroleum diesel is co-processed in two stages: the mixture is first hydrotreated to yield a reduced-sulfur hybrid intermediate, and then the hybrid intermediate is processed in an isomerization unit to yield a low cloud point hybrid diesel product that is partially derived from biomass. A notable benefit of at least some such methods/systems is that interstage removal of H2S and NH3 is not required between the stages of hydrotreating and isomerizing, wherein such benefit is afforded by sulfur- and nitrogen-tolerant isomerization catalysts.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to diesel fuels and specifically to methods and systems for efficiently making low-sulfur hybrid diesel biofuels by co-processing blends of petroleum diesel and vegetable or crop oils.BACKGROUND[0002]Biofuels are of increasing interest for a number of reasons including: (1) they are a renewable resource, (2) their production is less dependent on geopolitical considerations, (3) they provide the possibility of a direct replacement of petroleum-based fuels in existing vehicles, and (4) the net greenhouse gas emissions can be substantially reduced by virtue of CO2 uptake by biofuel precursors —particularly in the case of cellulosic feedstocks. See Pearce, “Fuels Gold,” New Scientist, September 23 pp. 36-41, 2006.[0003]An easily-obtainable biofuel is vegetable oil, which largely comprises triglycerides and some free fatty acids. The properties of vegetable oil, however make it generally inappropriate for use as a direct replac...

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Application Information

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IPC IPC(8): C10L1/18
CPCC10G45/08C10G45/62C10G45/64C10L1/08Y02E50/13C10G3/46C10G2300/207C10G3/50C10G2300/1014C10G2300/1055C10G2300/202C10G2300/304C10G2400/04C10G3/48Y02P30/20Y02E50/10
Inventor MILLER, STEPHEN JOSEPH
Owner CHEVROU USA INC
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