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. 22, 1978
Filed:
Jun. 29, 1977
Karl Heinrich Lieser, Seeheim, DE;
Peter Burba, Lampertheim, DE;
Riedel-de Haen Aktiengesellschaft, Seelze, Hannover, DE;
Abstract
The present invention relates to ion exchange compounds on cellulose basis having formula ##STR1## wherein R is a group that forms chelate complexes with metal ions, and Cell stands for the cellulose matrix. Suitable functional groups R are derivatives of known metal reactants, which show a high degree of selectivity for specific metal ions. The ion exchange compounds are able to fix specifically preferred ions e.g. metal ions even in a considerable excess of foreign ions, for example in concentrated salt solutions. The improved ion exchange compounds of this invention are prepared by reacting the compound ##STR2## with cellulose in the presence of alkali, diazotizing the cellulose derivative resulting therefrom and subsequently coupling couplable compounds which form chelate complexes with metal ions.