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:
Mar. 18, 2008
Filed:
Mar. 04, 2004
Eckhard Stroefer, Mannheim, DE;
Neven Lang, Mannheim, DE;
Hans Hasse, Kaiserslautern, DE;
Thomas Grützner, Stuttgart, DE;
Michael Ott, Neckargemünd, DE;
Eckhard Stroefer, Mannheim, DE;
Neven Lang, Mannheim, DE;
Hans Hasse, Kaiserslautern, DE;
Thomas Grützner, Stuttgart, DE;
Michael Ott, Neckargemünd, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Process for preparing high-concentration formaldehyde solutions having a CHO content of ≧50% by weight from an aqueous formaldehyde solution having a lower CHO content by evaporation of part of this solution (partial evaporation), in which the aqueous formaldehyde solution is heated to an evaporation temperature T at which the gas phase becomes enriched in water relative to the liquid phase and the gas phase formed is taken off continuously or discontinuously, wherein the evaporation temperature T obeys the relationship:T[° C.]<T[° C.]where T()=×(/100)+×(/100)×(/100)and