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:
Dec. 16, 2008
Filed:
Jul. 18, 2005
Juergen Kurt Plischke, Bear, DE (US);
Stephan Claude DE LA Veaux, Wilmington, DE (US);
Scott Rickbeil Frerichs, Hockessin, DE (US);
Jodi Lynn Witt, New Castle, DE (US);
Christian Normand, Quebec, CA;
Juergen Kurt Plischke, Bear, DE (US);
Stephan Claude De La Veaux, Wilmington, DE (US);
Scott Rickbeil Frerichs, Hockessin, DE (US);
Jodi Lynn Witt, New Castle, DE (US);
Christian Normand, Quebec, CA;
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
There is described an apparatus for making metal oxide particles which are substantially free of coarse tail from an oxidizing agent and a metal reactant in a flow reactor. The apparatus can be a concentric tubular flow reactor comprising a substantially funnel-shaped reactant contacting region located adjacent to a reaction zone which is able to direct a flow of a hot oxidizing agent towards a flow of the metal reactant to form a reaction stream which flows downstream into a reaction zone, whereby the hot oxidizing agent of the reaction stream is able to surround the flow of metal reactant sufficient to prevent the metal reactant from contacting the wall of the reactant contacting region and forming scale on the wall. A cooling fluid conduit being able to direct a flow of a cooling fluid into the reaction zone to flow coaxially with the reaction stream and to form a fluid curtain between the reaction stream and a baffle, which defines at least a portion of the reaction zone, while the metal reactant and hot oxidizing agent within the reaction stream react to form the metal oxide nanopowder prevents scale from forming on the baffle.