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Title: Water-soluble polymers for recovery of metal ions from aqueous streams

Abstract

A process of selectively separating a target metal contained in an aqueous solution by contacting the aqueous solution containing a target metal with an aqueous solution including a water-soluble polymer capable of binding with the target metal for sufficient time whereby a water-soluble polymer-target metal complex is formed, and, separating the solution including the water-soluble polymer-target metal complex from the solution is disclosed.

Inventors:
 [1];  [1]
  1. (Los Alamos, NM)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
871622
Patent Number(s):
US 5766478
Assignee:
Regents of University of California, Office of Technology (Alameda, CA) LANL
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
water-soluble; polymers; recovery; metal; aqueous; streams; process; selectively; separating; target; contained; solution; contacting; containing; including; polymer; capable; binding; sufficient; time; whereby; polymer-target; complex; formed; disclosed; selectively separating; water-soluble polymers; solution including; aqueous stream; solution containing; aqueous solution; sufficient time; metal complex; target metal; soluble polymer; polymer capable; metal contained; water-soluble polymer; soluble poly; aqueous streams; /210/423/

Citation Formats

Smith, Barbara F., and Robison, Thomas W. Water-soluble polymers for recovery of metal ions from aqueous streams. United States: N. p., 1998. Web.
Smith, Barbara F., & Robison, Thomas W. Water-soluble polymers for recovery of metal ions from aqueous streams. United States.
Smith, Barbara F., and Robison, Thomas W. Thu . "Water-soluble polymers for recovery of metal ions from aqueous streams". United States. doi:. https://www.osti.gov/servlets/purl/871622.
@article{osti_871622,
title = {Water-soluble polymers for recovery of metal ions from aqueous streams},
author = {Smith, Barbara F. and Robison, Thomas W.},
abstractNote = {A process of selectively separating a target metal contained in an aqueous solution by contacting the aqueous solution containing a target metal with an aqueous solution including a water-soluble polymer capable of binding with the target metal for sufficient time whereby a water-soluble polymer-target metal complex is formed, and, separating the solution including the water-soluble polymer-target metal complex from the solution is disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}

Patent:

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  • The use of water-soluble metal-binding polymers coupled with ultrafiltration (UF) is a technology under development to selectively concentrate and recover valuable or regulated metal-ions from dilute process or waste waters. The polymers have a sufficiently large molecular size that they can be separated and concentrated using commercially available UF technology. The polymers can then be reused by changing the solution conditions to release the metal-ions, which are recovered in a concentrated form for recycle or disposal. Pilot-scale demonstrations have been completed for a variety of waste streams containing low concentrations of metal ions including electroplating wastes (zinc and nickel) andmore » nuclear waste streams (plutonium and americium). Many other potential commercial applications exist including remediation of contaminated solids. An overview of both the pilot-scale demonstrated applications and small scale testing of this technology are presented.« less
  • A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO/sub 2/, which process comprises: (A) contacting the fluid stream in a contacting zone with an aqueous reaction solution at a temperature of between about 10 and 90C, the reaction solution itself comprising an effective amount of a water-soluble organic polymeric chelate, containing a polyvalent metal effective to absorb the NO present, wherein the polymeric chelate has a molecular weight of between about 500 and 1,000,000 and pendant chelating groups are selected from chelates of the formula; (B) separating the fluid stream andmore » the resulting aqueous phase containing the polymeric chelate iron (II) and imidodisulfonate of step (A); (C) concentrating the aqueous phase repeated in step (B) by membrane means effective to remove a portion of the water and other monomeric reaction products having a molecular weight below 500 and; (D) recycling the concentrated aqueous solution containing the water-soluble polymeric chelate produced in Step (C) to the contacting zone of step (A).« less
  • The present invention relates to a cyclic continuous process and composition for the removal of NO and SO/sub 2/ from a variety of fluid streams. A fluid stream containing NO and SO is contacted with an aqueous solution of water-soluble organic polymeric chelate containing a polvalent metal, e.g., Fe (II). The NO is catalytically absorbed and in the presence of SO/sub 2/, the imidodisulfonate is formed. Optionally, a reducing agent, such as sodium hydrogen sulfide, is added to maintain the polyvalent metal in the reduced state. The process next includes removal of the imidodisulfonate formed. The separation of water andmore » low molecular weight materials and products, e.g. molecular weight below 500, usually occurs by ultrafiltration or dialysis, with recycle and re-use of the polyvalent metal chelate.« less
  • A cyclic process is described for the removal of H/sub 2/S from a gas stream comprising H/sub 2/S, which process comprises: contacting the gas stream in a contacting zone with an aqueous reaction solution at between about 10/sup 0/ and 90/sup 0/C for a time sufficient to oxidize S/sup =/ to elemental sulfur the reaction solution itself consisting of an amount of water-soluble organic polymeric chelate effective to oxidize the S identical to elemental sulfur containing an oxidizing polyvalent metal selected from an organic polymeric chelate having a molecular weight of between about 1,000 and 500,000 daltons; separating the gasmore » stream and the resulting aqueous phase containing sulfur and polymeric chelated-metal complex; separating the sulfur from the aqueous phase; treating the aqueous solution by membrane separation to remove water ad other monomeric reaction products present having a molecular weight of less than 500 daltons from the aqueous solution; contacting the concentrated aqueous solution with an oxidizing agent under reaction conditions effective to oxidize the polyvalent metal in chelate form; and recycling the concentrated aqueous solutions to the contacting zone.« less
  • The interaction between cupric ions and poly(acrylic acid) (PAA) in aqueous solutions has been reexamined by EPR, magnetic susceptibility, and optical absorption. Cupric ions exist in solutions at pH < 3 as ordinary hydrated ions, and in the pH range 3-8, two mononuclear complexes with carboxyl groups of PAA are formed in equilibrium with other complex species; the two complexes have the same coordination structures as Cu(OAc)/sup +/ and Cu(OAc)/sub 2/, where OAc/sup -/ denotes acetate anion. Around pH 4, two slightly different binuclear copper(II) complexes of the cupric acetate type are formed in high yields; at (PAA polymer residue)/(Cu/supmore » 2 +/) less than or equal to 10, about 90% of the cupric ions form such binuclear complexes. At pH > 6, Cu(OH)/sub 2/ is gradually formed and complex species other than Cu(OH)/sub 2/ finally disappear at pH > 9. Cu(OH)/sub 2/ does not deposit but remains in solution by hydrophobic interaction with PAA, as in the case with poly(vinyl alcohol).« less