Claims
- 1. A process for the liquefaction of a solid carbonaceous material wherein the solid carbonaceous material is at least partially liquefied in a plurality of stages and in the presence of an added hydrogenation catalyst, which catalyst is present in all stages, wherein a solvent containing at least 1.25 wt. % donatable hydrogen is used in the second or subsequent stages while a hydrogen donor solvent containing less than 1.25 wt. % donatable hydrogen is employed in the first stage and wherein the liquefaction is accomplished in the presence of a residue comprising partially liquefied solid carbonaceous material, which residue comprising partially liquefied solid carbonaceous material is separated from the liquefaction product, and at a temperature within the range from about 650.degree. F. to about 950.degree. F. and at a pressure within the range from about 300 to about 3000 psig to produce a gaseous product, a liquid product and a normally solid bottoms product.
- 2. The improvement of claim 1 wherein the liquefaction effluent from the last stage is separated to yield a liquefaction distillate fraction having an initial boiling point within the range from about 350.degree. F. to about 425.degree. F. and a final boiling point within the range from about 700.degree. F. to about 800.degree. F., which distillate fraction is separately hydrogenated and used in part, at least, as the solvent and a bottoms fraction having an initial boiling point within the range from about 950.degree. F. to about 1100.degree. F. and wherein a portion of the bottoms fraction is used as the residue during liquefaction.
- 3. The improvement of claim 1 wherein a light boiling fraction having a final point within the range from about 350.degree. F. to about 650.degree. F. is separated from the effluent from the first liquefaction stage, a portion of the heavier boiling fraction having an initial boiling point within the range from about 350.degree. F. to about 650.degree. F. is recycled to the first stage as residue and the remaining portion of the heavier fraction is subjected to further liquefaction in a second or subsequent stage.
- 4. The improvement of claim 1 wherein a heavy boiling fraction having an initial boiling point within the range from about 350.degree. F. and 425.degree. F. is separated from the effluent of the first stage, a portion of the heavier fraction having an initial boiling point within the range from about 350.degree. F. to about 425.degree. F. is recycled to the first stage as bottoms and the remaining portion of the heavier fraction is further separated to yield a distillate fraction having an initial boiling point within the range from about 350.degree. to about 425.degree. F. and a final boiling point within the range from about 700.degree. F. to about 800.degree. F. and wherein at least a portion of this fraction is used directly as a solvent in the first stage and wherein the remainder of the heavier fraction is subjected to further liquefaction in a second or subsequent liquefaction stage.
- 5. The improvement of claim 4 wherein the second or subsequent stage liquefaction effluent is separated into a light fraction having a final boiling point within the range from about 350.degree. F. to about 425.degree. F., a middle distillate fraction having an initial boiling point within the range from about 350.degree. F. to about 425.degree. F. and a final boiling point within the range from about 700.degree. to about 800.degree. F. and a bottoms fraction having an initial boiling point within the range from about 950.degree. F. and 1100.degree. F. and wherein at least a portion of the middle distillate fraction is separately hydrogenated such that the same contains at least 1.25 wt % donatable hydrogen and wherein at least a portion of this fraction is used as a solvent in the second or subsequent stage and wherein at least a portion of the bottoms fraction is returned to the second or subsequent stage liquefaction.
- 6. The improvement of claim 1 wherein a middle distillate having an initial boiling point within the range from about 350.degree. F. to about 425.degree. F. is separated from the effluent from the first stage and is hydrogenated such that the same contains at least 1.25 wt. % donatable hydrogen and wherein at least a portion of this fraction is used as the solvent in the second or subsequent stage.
- 7. The improvement of claim 6 wherein the effluent from the second or subsequent stage is separated into a lighter fraction having a final boiling point within the range from about 350.degree. to about 425.degree. F. a middle distillate fraction having an initial boiling point within the range from about 350.degree. F. to about 425.degree. F. and a bottoms fraction having an initial boiling point within the range from about 950.degree. F. to about 1100.degree. F. and wherein at least a portion of the middle distillate fraction is used directly as the solvent in the first stage and wherein a portion of the bottoms fraction is recycled to the first stage as residue and another portion of the bottoms fraction is recycled to the second or subsequent stage as residue.
- 8. The improvement of claim 1 wherein the catalyst or catalyst precursor is added to a slurry of the solid carbonaceous material and solvent or diluent at a concentration within the range from about 20 to about 2000 ppm, based on active metal.
- 9. The improvement of claim 8 wherein the catalyst or catalyst precursor is added as an oil soluble metal compound.
- 10. The improvement of claim 9 wherein the catalyst or catalyst precursor is phosphomolybdic acid added at a concentration within the range from about 100 to about 1000 ppm by weight based on coal.
Parent Case Info
This is a continuation of application Ser. No. 213,449, filed Dec. 5, 1980, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2735609 |
Apr 1978 |
DEX |
WO8000155 |
Jul 1978 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Bureau of Mines Bulletin 622; U.S. Dept. of the Interior, Bureau of Mines (1965) pp. 24-28. |
Continuations (1)
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Number |
Date |
Country |
Parent |
213449 |
Dec 1980 |
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