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:
Apr. 07, 1981
Filed:
Dec. 17, 1979
Applicant:
Inventors:
Kurt Klinkmann, Leverkusen, DE;
Raimund Wambach, Leverkusen, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
568414 ; 203 38 ; 203 41 ; 203 66 ; 568497 ; 568872 ; 210664 ; 210668 ; 210687 ; 210688 ;
Abstract
The invention is directed to a process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds containing calcium or lead compounds or mixtures thereof. Methanol and a precipitant for calcium and/or lead ions in a quantity equivalent to the ions to be removed are added to the solutions. The deposits thus formed are removed and the residual solutions are treated with a cation exchanger followed by distillation of the low-boiling fractions. The distillation sump which essentially contains the low molecular weight polyhydroxyl compounds is then treated with an anion exchanger.