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AssigneeThe Pittsburg & Midway Coal Mining Co.
InventorsRaymond P. Anderson, David K. Schmalzer, Charles H. Wright
Estimating the term…
The relative ratio of heavy distillate to light distillate produced in a coal liquefaction process is continuously controlled by automatically and continuously controlling the ratio of heavy distillate to light distillate in a liquid solvent used to form the feed slurry to the coal liquefaction zone, and varying the weight ratio of heavy distillate to light distillate in the liquid solvent inversely with respect to the desired weight ratio of heavy distillate to light distillate in the distillate fuel oil product. The concentration of light distillate and heavy distillate in the liquid solvent is controlled by recycling predetermined amounts of light distillate and heavy distillate for admixture with feed coal to the process in accordance with the foregoing relationships.
A continuous process for controlling the relative ratio of heavy distillate to light distillate produced in a coal liquefaction process, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone, said liquid solvent comprising a heavy distillate and a light distillate in a predetermined ratio of heavy distillate to light distillate to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and light distillate, wherein the ratio of heavy distillate to light distillate in the product fuel oil varies inversely with the ratio of heavy distillate to light distillate in the liquid solvent, and continuously controlling the weight ratio of heavy distillate to light distillate in the fuel oil product by varying the weight ratio of heavy distillate to light distillate fed to the liquefaction zone inversely to the desired weight ratio of heavy distillate to light distillate in the fuel oil product, said heavy distillate and said light distillate in said liquid solvent comprising recycle distillate fractions, said heavy distillate boiling in the range of between about 550.degree. F. (288.degree. C.) to about 900.degree. F. (482.degree. C.) and said light distillate boiling in the range of between about 380.degree. F. (193.degree. C.) to about 550.degree. F. (288.degree. C.), said liquid solvent comprising heavy distillate and light distillate in a ratio of heavy distillate to light distillate of greater than 3:1 on a weight basis.
A coal liquefaction process for maximizing the concentration of light distillate produced, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone. said liquid solvent comprising a heavy distillate boiling in the range of between about 550.degree. F. (288.degree. C.) to about 900.degree. F. (482.degree. C.) and a light distillate boiling in the range of between about 350.degree. F. (177.degree. C.) to about 550.degree. F. (288.degree. C.) in a predetermined ratio of heavy distillate to light distillate of greater than 7:1 on a weight basis to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and a high proportion of light distillate.
A continuous process for controlling the relative ratio of heavy distillate to light distillate produced in a coal liquefaction process, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone, said liquid solvent comprising a heavy distillate and a light distillate in a predetermined ratio of heavy distillate to light distillate to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and light distillate, wherein the ratio of heavy distillate to light distillate in the product fuel oil varies inversely with the ratio of heavy distillate to light distillate in the liquid solvent, and continuously controlling the weight ratio of heavy distillate to light distillate in the fuel oil product by varying the weight ratio of heavy distillate to light distillate fed to the liquefaction zone inversely to the desired weight ratio of heavy distillate to light distillate in the fuel oil product, said heavy distillate and said light distillate in said liquid solvent comprising recycle distillate fractions, said heavy distillate boiling in the range of between about 550.degree. F. (288.degree. C.) to about 900.degree. F. (482.degree. C.) and said light distillate boiling in the range of between about 380.degree. F. (193.degree. C.) to about 550.degree. F. (288.degree. C.), said liquid solvent comprising heavy distillate and light distillate in a ratio of light distillate to heavy distillate of greater than 3:1 on a weight basis.
A continuous process for controlling the relative ratio of heavy distillate to light distillate produced in a coal liquefaction process, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone, said liquid solvent comprising a heavy distillate and a light distillate in a predetermined ratio of heavy distillate to light distillate to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and light distillate, wherein the ratio of heavy distillate to light distillate in the product fuel oil varies inversely with the ratio of heavy distillate to light distillate in the liquid solvent, and continuously controlling the weight ratio of heavy distillate to light distillate in the fuel oil product by varying the weight ratio of heavy distillate to light distillate fed to the liquefaction zone inversely to the desired weight ratio of heavy distillate to light distillate in the fuel oil product, said heavy distillate and said light distillate in said liquid solvent comprising recycle distillate fractions, said heavy distillate boiling in the range of between about 500.degree. F. (260.degree. C.) to about 900.degree. F. (482.degree. C.) and said light distillate boiling in the range of between about 350.degree. F. (177.degree. C.) to about 600.degree. F. (316.degree. C.), the desired light distillate yield, LD.sub.2, being continuously controlled in substantial accordance with the formula:
A continuous process for controlling the relative ratio of heavy distillate to light distillate produced in a coal liquefaction process, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone, said liquid solvent comprising a heavy distillate and a light distillate in a predetermined ratio of heavy distillate to light distillate to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and light distillate, wherein the ratio of heavy distillate to light distillate in the product fuel oil varies inversely with the ratio of heavy distillate to light distillate in the liquid solvent, and continuously controlling the weight ratio of heavy distillate to light distillate in the fuel oil product by varying the weight ratio of heavy distillate to light distillate fed to the liquefaction zone inversely to the desired weight ratio of heavy distillate to light distillate in the fuel oil product, said heavy distillate and said light distillate in said liquid solvent comprising recycle distillate fractions, said heavy distillate boiling in the range of between about 500.degree. F. (260.degree. C.) to about 900.degree. F. (482.degree. C.) and said light distillate boiling in the range of between about 350.degree. F. (177.degree. C.) to about 600.degree. F. (316.degree. C.), the desired heavy distillate yield, HD.sub.2, being continuously controlled in substantial accordance with the formula:
A coal liquefaction process for maximizing the concentration of light distillate produced, which comprises passing a mineral-containing feed coal, hydrogen, recycle normally solid dissolved coal, recycle mineral residue and a liquid solvent to a coal liquefaction zone, said liquid solvent comprising a heavy distillate boiling in the range of between about 550.degree. F. (288.degree. C.) to about 900.degree. F. (482.degree. C.) and a light distillate boiling in the range of between about 350.degree. F. (177.degree. C.) to about 550.degree. F. (288.degree. C.) in a predetermined ratio of heavy distillate to light distillate of greater than 5:1 on a weight basis to dissolve hydrocarbonaceous material of said feed coal and to hydrocrack said hydrocarbonaceous material to produce a product fuel oil containing heavy distillate and a high proportion of light distillate, said product fuel oil containing a ratio of heavy distillate to light distillate below about 1.5:1 on a weight basis.
Dependencies are inferred from the claim text.