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:
Oct. 25, 1983
Filed:
Feb. 10, 1982
Yoshio Matsuura, Funabashi, JP;
Michio Kurihara, Mitaka, JP;
Takao Kamei, Ashiya, JP;
Akira Nakamura, Akashi, JP;
Keiichi Komai, Akashi, JP;
Takeshi Wakabayashi, Kobe, JP;
Electric Power Development Co., Tokyo, JP;
Kawasaki Kabushiki Kaisha, Kobe, JP;
Abstract
An economical method for liquefying low rank coal is proposed. The method comprises steps of providing water-coal slurry by mixing crushed coal with water, heating the slurry under a pressure to a temperature which is lower than the saturated temperature under the pressure to thereby remove water from the coal with a result that coal content in the slurry be decreased, separating liquid in the slurry from solids, performing heat exchange between the separated liquid and the said pressurized water-coal slurry, then mixing the liquid with crushed coal to provide a further water-coal slurry, mixing the separated solids with a solvent to provide a fluid, evaporating water contents in the fluid, cooling the evaporated water to thereby condense it so as to recover volatile material, heating and pressurizing residual part of the fluid to a temperature and pressure suitable for liquefaction reaction with addition of hydrogen to obtain a liquefaction reactant then subjecting the reactant to a heat exchange with the water-coal slurry to cool the reactant to a temperature suitable for distillation, recirculating at least a part of the liquefaction reactant so that it is used at least a part of the solvent.