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. 02, 2010
Filed:
Sep. 21, 2007
Helmut Schmidtke, Bensheim, DE;
Martin Rudloff, Gönnheim, DE;
Helmut Schmidtke, Bensheim, DE;
Martin Rudloff, Gönnheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for preparing electronics-grade 2,2'-aminoethyoxyethanol by reacting diethylene glycol with ammonia in the presence of a catalyst in a reactor to give a reaction mixture from which a crude 2,2′-aminoethoxyethanol stream is separated off and is purified further by distillation in a pure column, wherein a sidestream comprising electronics-grade 2,2′-aminoethoxyethanol is taken off from the pure column as a result of the diethylene glycol being passed through a filter which ensures a degree of removal of at least 99% for solid particles having a maximum particle size of ≦1.5 μm before the diethylene glycol is fed into the reactor, is proposed.