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. 26, 2003
Filed:
May. 31, 2000
Eckhard Ströfer, Mannheim, DE;
Stephan Scholl, Bad Dürkheim, DE;
Hans Hasse, Kaiserslautern, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A method of reacting a solution comprising a mixture of chemical compounds which are in chemical equilibrium with one another with at least one further chemical compound ( ) is provided. The method comprises the following steps: fractionation of the solution by means of a separation method to give at least two fractions ( ) which are enriched in different chemical compounds of the mixture; and reaction of a fraction ( ) with the further chemical compound or compounds ( ). The fractionation is advantageously carried out using a film evaporator ( ). Unreacted fractions ( ) can be recirculated via a residence time vessel ( ) back to the fractionation step. The method is particularly suitable for reactions of an aqueous formaldehyde solution in which various components of the solution (formaldehyde, methylene glycol, polyoxymethylene glycols) react in different ways.