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:
Aug. 20, 1985
Filed:
Oct. 03, 1984
Applicant:
Inventors:
Lothar Kaufmann, Hennef, DE;
Klaus-Dieter Hellwig, Bad Honnef, DE;
Assignee:
Degussa Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423508 ; 423592 ;
Abstract
A method for the preparation of alkali metal selenates through oxidation of powdered selenium with hydrogen peroxide and neutralization of the formed selenic acid with alkali metal hydroxide or alkali metal carbonate, wherein the selenium oxide in the first step is brought to reaction at the surface of a warmed portion of hydrogen peroxide and subsequently in a second step the resulting acid solution is partially neutralized and the remaining selenite is further converted with hydrogen peroxide to the selenate.