Patent US2110646A successfully refreshed from Google Patents.
Patent US4629741A successfully refreshed from Google Patents.
US4629741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium oxide in ion exchange resins and use to remove multivalent metal cations from solutions of at least 1% salinity
Assignee: Dow Chemical Co
•
Filing: 1985-10-21
•
Granted: 1986-12-16
•
Expires: 2005-10-21
Abstract
Abstract Novel anion exchange resin composites having hydrous chromium III oxide (Cr 2 O 3 .nH 2 O) incorporated therein are useful in removing a wide array of polyvalent metal cations from aqueous solution.
Inventors
- 👤 Alvin F. Beale, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:55
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/17; B01J41/00; B01J41/08; B01J41/10; B01J47/00; B01J47/018; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
A method for preparing an aqueous solution contaiing polyvalent metal cations for use in a process wherein the polyvalent metal cations are to be removed by ion exchange using a composite comprising an anion exchange resin having incorporated therein hydrous chromium III oxide conforming substantially to the empirical formula Cr 2 O 3 .nH 2 O where nH 2 O signifies waters of hydration, said method comprising adding to said aqueous solution an amount of inorganic ammonium and/or alkali metal salt to convert said aqueous solution to a saline solution of at least about 1% salinity, said amount providing at least as many moles of said salt as there are moles of polyvalent metal cations to be removed from the aqueous solution.
Claim 2
Independent Claim
122 words
A method for preparing an aqueous solution contaiing polyvalent metal cations for use in a process wherein the polyvalent metal cations are to be removed by ion exchange using a composite comprising an anion exchange resin having incorporated therein hydrous chromium III oxide conforming substantially to the empirical formula Cr 2 O 3 .nH 2 O where nH 2 O signifies waters of hydration, said method comprising adding to said aqueous solution an amount of inorganic ammonium and/or alkali metal salt to convert said aqueous solution to a saline solution of at least about 1% salinity, said amount providing at least as many moles of said salt as there are moles of polyvalent metal cations to be removed from the aqueous solution.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the so-formed saline solution has an ammonium and/or alkali metal salt concentration of at least about 4% by weight.
Claim 4
Dependent Claim
60 words
The method of claim 1 wherein the ammonium and/or alkali metal salt comprises an ammonium salt or at least one alkali metal of the group consisting of Na, K, and Li in a salt form wherein the salt anion moiety is at least one selected from the group consisting of halide, sulfate, nitrate, sulfite, nitrite, phosphate, phosphite, acetate, and formate.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the alkali metal salt is predominantly an alkali metal halide.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the alkali metal salt is predominantly NaCl, KCl, and/or LiCl.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal salt is predominantly NaCl.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the salt is an ammonium salt.
Claim 9
Dependent Claim
30 words
The method of claim 1 wherein the amount of Cr 2 O 3 .nH 2 O in the resin is greater than the about 0.5 millimoles per cc of resin.
Claim 10
Dependent Claim
36 words
The method of claim 1 wherein the amount of Cr 2 O 3 .nH 2 O in the resin is an amount in the range of about 0.75 to about 3 millimoles per cc of resin.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein the anion exchange resin is characterized as a particulate water-insoluble polymeric resin which contains basic amine groups attached thereto.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein the resin is a macroporous anion exchange resin.
Claim 13
Dependent Claim
35 words
The method of claim 1 wherein the polyvalent metal cations are divalent and/or trivalent ions of at least one metal of the Periodic Table Groups comprising IIA, IIIB, VIIB, VIII, IB, IIB, IIIA, and IVA.
Claim 14
Dependent Claim
26 words
The method of claim 1 wherein the aqueous solution contains salinity values with an ionic strength of 0.15 or greater following the addition of said salt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |