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:
Sep. 05, 1978
Filed:
Sep. 23, 1976
Michael C Chervenak, Pennington, NJ (US);
Edwin S Johanson, Princeton, NJ (US);
Hydrocarbon Research, Inc., Lawrenceville, NJ (US);
Abstract
The hydrogenation of low rank coal to produce hydrocarbon liquids and gases is conducted in a first stage reaction zone at elevated temperature and pressure and without catalyst, followed by further hydrogenation of the total effluent in a second stage ebullated bed catalytic reaction zone which is maintained at slightly lower temperature. The first stage may comprise an ebullated bed of high density non-catalytic contact material. However, the presence of such contact material is not required. Clarified hydrocarbon liquid streams are returned to the first stage reaction zone as the slurrying oil and to the second stage zone as recycle oil to maintain a significantly high percentage of unconverted coal solids in the first stage reaction zone than in the second stage zone. This two stage reaction arrangement produces a high percentage conversion of the low rank coal to liquid and gaseous products with good process operability.