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:
Feb. 01, 2000
Filed:
Jun. 25, 1998
Applicant:
Inventors:
Jorg Talbiersky, Dorsten, DE;
Edgar Fuhrmann, Castrop-Rauxel, DE;
Heinz-Gunter Janneck, Datteln, DE;
Assignee:
Rutgers VFT AG, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
546181 ;
Abstract
In a method of purifying quinaldine prepared from coal tar, a phenol, cresol and xylenol-type mononuclear aromatic compound is added to the quinaldine fraction, said aromatic compound is crystallized out forming an adduct with quinaldine and the quinaldine/mononuclear aromatic adduct is then separated, whereby, before the mononuclear aromatic compound is added, 5% to 20% by weight of a mixture of aromatic compounds or toluene, in relation to the mass of the quinaldine fraction, is added to the quinaldine fraction.