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:
Jun. 25, 1991
Filed:
Apr. 20, 1990
Applicant:
Inventors:
Gerhard Meyer, Obernburg, DE;
Gunter Sudheimer, Darmstadt, DE;
Hans Zengel, Kleinwallstadt, DE;
Hans Grothaus, Cologne, DE;
Assignee:
Akzo N.V., , NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01C / ;
U.S. Cl.
CPC ...
423366 ;
Abstract
Aqueous ammonium thiocyanate solutions are prepared continuously by reaction of ammonia with carbon disulfide in the presence of water using activated carbon as catalyst at pressures of from 2 to 7 bar. In this way, a very pure product can be obtained. The process can be carried out at very low cost, because both the addition of ammonia to carbon disulfide and the decomposition of the resulting ammonium dithiocarbamate can be carried out in a reactor in one step under identical conditions.