The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1981
Filed:
Oct. 22, 1979
Christopher W Kuehler, Larkspur, CA (US);
Chevron Research Company, San Francisco, CA (US);
Abstract
Disclosed is a three-stage process for liquefying coal. In the process subdivided coal is slurried with a hydrogen-lean hydrogen-donor solvent and passed through a dissolving zone at a temperature in the range 400.degree.-480.degree. C. and at a space velocity in the range 2-150 hr..sup.-1 to substantially dissolve said coal. The effluent from the dissolver is stabilized with a hydrogen-rich hydrogen-donor solvent in a stabilization zone at a temperature in the range of 400.degree.-440.degree. C. and at a space velocity in the range 1-12 hr..sup.31 1 to partially hydrogenate the dissolved coal. A portion of the effluent from the stabilizer is recycled for use as hydrogen-lean hydrogen-donor solvent and the remainder is passed to a catalytic reaction stage operating under hydrocracking conditions to produce the net product and hydrogen-rich hydrogen-donor solvent.