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:
Jan. 12, 1982
Filed:
Feb. 10, 1981
Ingo Romey, Hunxe, DE;
Reinhard Pass, Essen, DE;
Bergwerksverband GmbH, Essen, DE;
Abstract
The filter cake resulting from the filtration of tar, pitch, coal extract or coal oil with the help of a filter aid, is dried by blowing an inert gas through it. Thereafter it is comminuted to a particle size of about 0.5 mm and these particles are heated in a fluidized bed at the rate of 1000.degree. C./min to a temperature of 500.degree.-1200.degree. C. There is obtained a size mix of swelled particles from which a fraction having a size of about 0.05-0.3 mm is segregated and recirculated to the filter as a filter aid. Particles having a size above or below the segregated fraction are thermally decomposed, as are gaseous and liquid products which are liberted during the thermal treatment in the fluidized bed.