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. 13, 1991
Filed:
Apr. 19, 1990
Friedrich Bittner, Bad Soden, DE;
Walter Hinrichs, Bruehl, DE;
Lutz Hippe, OberRamstadt, DE;
Ludwig Lange, Bruehl, DE;
Erich Splett, Huerth-Berrenrath, DE;
Degussa Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
In a method of preparing sodium monosulfide by means of reacting sodium and sulfur under protective gas, the entire sodium determined for reaction is placed in a receiver in a first stage, preheated to temperatures of 100.degree.-150.degree. C., sulfur is gradually added in the required amount of the material in the receiver under intensive mixing, whereby the temperature of the reaction mixture is maintained at 120.degree.-250.degree. C., and in a second stage the formed initial product is allowed to react under continuation of the mixing at 250.degree.-480.degree. C., until a Na.sub.2 S content of at least 95% by weight has been attained.