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:
Jul. 01, 1980
Filed:
Mar. 14, 1977
Scott C Roberts, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
A process for pyrolysis of coal wherein the subdivided coal is preheated, pyrolyzed, and subjected to heat recovery after pyrolysis, heat transfer being effected by contacting the subdivided coal as a dilute-phase fluidized bed in the first stage of dual preheating zones with a first particulate heat carrier, with a second particulate heat carrier in a dense-phase fluidized bed in the second preheating stage, followed by pyrolysis in a dense-phase fluidized bed pyrolysis zone. The separate particulate heat carriers are employed in such manner that one mass of heat carrier is utilized for preheating the subdivided coal in the first stage and heat recovery, and a second mass of heat carrier is utilized for pyrolysis of the coal and the second stage preheating.