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. 07, 2003
Filed:
Aug. 04, 2000
Applicant:
Inventors:
Robert Magiera, Frankfurt, DE;
Hans Christian Alt, Gelnhausen, DE;
Gerhard Rasig, Hanau, DE;
Jörg Münzenberg, Hanau, DE;
Christoph Batz-Sohn, Hanau, DE;
Ralf Goedecke, Rodenbach, DE;
Ulrich Deschler, Sailauf, DE;
Volker Knapp, Oberursel, DE;
Karl-Heinz Rützel, Hürth, DE;
Assignee:
Degussa AG, Dusseldorf, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 1/722 ; C01B 1/738 ;
U.S. Cl.
CPC ...
C01B 1/722 ; C01B 1/738 ;
Abstract
A process is disclosed for the preparation of anhydrous sodium sulfide by heating sodium sulfide having a water content of from 38 to 40% in a contact drier in vacuo, the temperature of the solid to be dried being increased from approximately 20° C. at the solid inlet to ≧180° C. at the solid outlet.