Modified anion exchange materials with metal inside the materials, method of making same and method of removing and recovering metals from solutions

a technology of anion exchange materials and metals, applied in the direction of ion exchangers, water/sewage treatment by ion exchange, chemistry apparatus and processes, etc., can solve the problems of affecting the quality of the material, the amount of arsenic contamination is naturally occurring, and the percentage of removal can be somewhat problematic, so as to achieve the effect of low cos

Inactive Publication Date: 2006-02-23
RESINTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] Thus, the present invention provides low cost, very robust, modified anionic exchange materials having a metal inside the materials which are capable of functioning in a variety of apparatus as in a very wide range of operating conditions since the metal inside the exchange materials is not easily displaced from the material.

Problems solved by technology

Although some arsenic enters the environment from manmade sources, most arsenic contamination is naturally occurring.
However, with any coagulation process, if upsets occur, the percentage of removal can be somewhat problematic.
Also, membrane processes are generally considered overly expensive for drinking water applications, unless reduction of total dissolved solids is desired.
Ion exchange, although often touted for arsenic removal is limited, primarily because sulfate, which is present in most potable water, interferes strongly.
However, this precipitates iron, which destroys the functionality of the resin.
Some build up of iron is observed, primarily on the surface, which eventually causes a decrease in performance after a few cycles.
The chromium is not able to load onto the anion resin as a chloride complex and it does not form anionic complexes with chloride.
However, it is unclear whether an anion resin is even required.
All types of anion exchange materials used in, for example, adsorption columns that operate for many thousands of bed volumes are prone to fouling with suspended solids and operational problems, such as channeling.
However, cost per pound is not always the best indicator of the effectiveness of an anion exchange material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific embodiments and examples

DESCRIPTION OF SPECIFIC EMBODIMENTS AND EXAMPLES

Example 1

[0068] Ferric chloride solutions with varying amounts of water, NaCl and HCl were prepared in varying ratios of the ingredients as listed in columns A thru Im. The solutions were then combined with ResinTech SBG1 (Chloride form) and placed into a 1 liter glass beaker fitted with a magnetic stirrer bar. A single source of resin was used in all these experiments. In experiments A thru G, the resin was pre-rinsed with an equal amount of saturated NaCl (“brine”) solution. It was determined by experimentation that this treatment would remove a large amount of water from the resin causing it to shrink substantially. Tests determined that the shrinkage was 14.9%. Sufficient resin was prepared by passing an equal volume of saturated NaCl solution through the resin to supply experiments A thru G. The actual volume of brine treated resin was 85.1% of the designated 200 mL in experiments A thru G. This is equivalent to starting with 200...

example 2

[0072] A solution comprised of 120 milliliters of 36% ferric chloride and 200 milliliters of saturated sodium chloride (26.4% NaCl) was passed slowly through a column of 200 milliliters of ResinTech SBG1. The solution is then drained from the resin bed. Next, a solution containing 60 mL of 50% NaOH and 120 mL of deionized water is added to the resin bed and the mixture of resin and solution was mixed for about 1.5 hours. The solution was then drained from the resin bed and the resin bed was rinsed with deionized water to remove any remaining solution and externally precipitated iron from the resin bed.

example 3

[0073] A solution comprised of 120 milliliters of 36% ferric chloride and 200 milliliters of saturated sodium chloride (26.4% NaCl) and 7 milliliters of 30% HCl was passed through a column of 200 milliliters of ResinTech SBG1, over a period of 8 hours. The solution was then drained from the resin bed leaving less then 10% of the resin showing signs of liquid. Next, a solution containing 60 mL of 50% NaOH and 120 mL of deionized water was added to the resin bed and the mixture of resin and solution was mixed for about 1 hour. The solution was then drained from the resin bed and the resin bed is backwashed, air mixed and rinsed with deionized water to remove any remaining solution and externally precipitated iron from the resin bed. The resulting product is expected to contain approximately 70 grams of iron per liter of resin.

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Abstract

The present invention relates, generally, to the art of impregnating metal complexes into anion exchange materials to provide improved anion exchange materials with a metal inside the materials such that the modified materials effectively and efficiently remove or recover various metals, including metal containing complexes, compounds, and contaminants, such as arsenic, from, for example, process solutions, effluents and aqueous solutions. Uses for the improved anion exchange materials are also described as are methods of making modified anion exchange materials, and methods of removing and recovering at least one metal or contaminant from a source.

Description

RELATED APPLICATIONS [0001] This application claims the benefit of U.S. provisional patent application No. 60 / 603,161 filed on Aug. 20, 2004.FIELD OF THE INVENTION [0002] The present invention relates, generally, to polymeric anionic exchange materials, including resins, in which a metal complexing group or substance is not only present on the materials but is also located inside the materials. Also described are methods for making improved anionic exchange materials and for removing and recovering metals and contaminants from a source including, for example, ground and potable water. BACKGROUND OF THE INVENTION [0003] Arsenic, in its metallic form, does not occur in nature and in fact is practically of no commercial value. Arsenic trioxide, however, is a classic inorganic poison, which was used for many years to, among other things, control insects. Although some arsenic enters the environment from manmade sources, most arsenic contamination is naturally occurring. Arsenic in water...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C02F1/42
CPCB01J41/04B01J41/14B01J47/006C02F2101/20C02F2001/422C02F2101/103C02F1/42B01J47/016
Inventor GOTTLIEB, MICHAEL C.MEYERS, PETER S.
Owner RESINTECH
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