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:
May. 03, 1988
Filed:
Dec. 04, 1986
Robert R Grinstead, Walnut Creek, CA (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention relates to a cyclic continuous process and composition for the removal of metal ions, particularly transition metal ions, from aqueous solutions a fluid stream containing the metal ions is contacted with an aqueous solution of a water soluble organic polymeric chelant. The metal is chelated by the chelant: The separation of water and low molecular weight products (molecular weight less than 500) is accomplished usually by dialysis or ultrafiltration. The metal ion is then released using dilute mineral acid and collected. The water-soluble chelant is then recycled. The metal ions chelated removed included iron, cobalt, copper, vanadium, cadmium, nickel, zinc, lead, and aluminum. A preferred chelant is one having a pendant pyridine group in conjunction with alkyl amine groups, e.g., --N(R)--CH.sub.2 --C.sub.5 H.sub.4 N, where R is alkyl.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile