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:
Oct. 05, 1976
Filed:
Jul. 18, 1975
Ferdinand Weinrotter, Linz (Danube), OE;
Alfred Schmidt, Vienna, OE;
Karlheinz Wegleitner, Linz (Danube), OE;
Alfred Garber, Linz (Danube), OE;
Josef Herbert Hatzl, Linz (Danube), OE;
Rudolf Sykora, Linz-Dornach, OE;
Chemie Linz Aktiengesellschaft, Linz, OE;
Abstract
Guanidine carbonate is isolated from dilute aqueous solutions containing guanidine, urea, pyrolysis products of urea, ammonia and carbon dioxide, by evaporation of the solution at a temperature of 80.degree. to 130.degree. C until a guanidine carbonate content of 20g/l and a pyrolysis products content of not more than 28g/l at 80.degree. C or not more than 128.degree. g/l at 30.degree. C is achieved, without exceeding a heating time of 6 hours at the upper temperature limit, separation of the precipitated pyrolysis products, subsequent cooling to not more than 45.degree. C, addition of ammonia to an ammonia content of 15 to 30 % by weight and separation of the precipitated guanidine carbonate.