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:
Nov. 17, 1998
Filed:
Jul. 29, 1996
Applicant:
Inventors:
Otto Watzenberger, Ludwigshafen, DE;
Hans-Michael Schneider, Worms, DE;
Bernd Leutner, Frankenthal, DE;
Albrecht Wilhelm Friederang, New York, NY (US);
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C01B / ;
U.S. Cl.
CPC ...
203 78 ; 203-6 ; 203 12 ; 203 79 ; 203 80 ; 203 92 ; 203 93 ; 203 94 ; 203 96 ; 203 97 ; 203 98 ; 203 99 ; 203D / ; 423387 ;
Abstract
An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at .ltoreq.80.degree.0 C. The novel process can be carried out in a simple and gentle manner and on a large industrial scale. Owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process, the risk of decomposition is minimized.