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. 19, 1999
Filed:
Mar. 28, 1996
Applicant:
Inventors:
Donald H Eastham, Victoria, TX (US);
Ted M Knowlton, Willowbrook, IL (US);
Melvyn B Pell, Wilmington, DE (US);
James W Reeves, Wilmington, DE (US);
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ; C22B / ;
U.S. Cl.
CPC ...
423 74 ; 423D / ;
Abstract
The present invention is a process for feeding particulate material to a fluidized bed reactor operated at greater than atmospheric through a standpipe wherein the ratio of the absolute pressure where the standpipe enters the fluidized bed reactor to the absolute pressure where the particulate material enters the standpipe is at least about 1.5 and gas is injected into the standpipe at a velocity which is about 20-80 percent of the minimum fluidization velocity of the particulate material.