US4183900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of Mg++ from brines
Assignee: Dow Chemical Co
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Filing: 1978-09-05
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Granted: 1980-01-15
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Expires: 1998-09-05
Abstract
Abstract Magnesium values are selectively recovered from salt brines, even salt brines which contain competing ions such as Li + , Ca ++ , and Sr ++ , by contacting the brine with an anion exchange resin which has dispersed therein a microcrystalline structure of the formula MgX 2 .2Al(OH) 3 , where X is a halide.
Inventors
- 👤 John M. Lee
- 👤 William C. Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:20
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/016; C; C01; C01F; C01F7/00; C01F7/78
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A process for recovering Mg ++ values from brine, said process comprising 1. providing in an ion exchange column, a particulate anion exchange resin having suspended therein a microcrystalline MgX 2 .2Al(OH) 3 structure, where X is a halide, 2. eluting a portion of the MgX 2 , from said resin by passing an aqueous wash through it, 3. flowing a Mg ++ -containing brine through said resin until the resin is enriched to about its full capacity with MgX 2 , 4. repeating steps 2 and 3, sequentially, a plurality of times.
Claim 2
Dependent Claim
93 words
A process for recovering Mg ++ values from brine, said process comprising 1. providing in an ion exchange column, a particulate anion exchange resin having suspended therein a microcrystalline MgX 2 .2Al(OH) 3 structure, where X is a halide, 2. eluting a portion of the MgX 2 , from said resin by passing an aqueous wash through it, 3. flowing a Mg ++ -containing brine through said resin until the resin is enriched to about its full capacity with MgX 2 , 4. repeating steps 2 and 3, sequentially, a plurality of times.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the aqueous wash of step 2 contains a small amount of MgX 2 dissolved therein.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the concentration of MgX 2 in the aqueous wash is from about 50 to about 200 mg per liter, as Mg ++ .
Claim 5
Dependent Claim
81 words
A process for recovering Mg ++ values from brine, said process comprising 1. providing a particulate anion exchange resin having suspended therein a microcrystalline MgX 2 .2Al(OH) 3 structure, where X is a halide, which has had a portion of the MgX 2 removed by elution, 2. contacting a Mg ++ -containing brine with said resin, thereby enriching said resin with Mg ++ values from said brine, and 3. separating said resin, now enriched with Mg ++ values, from said brine.
Claim 6
Dependent Claim
81 words
A process for recovering Mg ++ values from brine, said process comprising 1. providing a particulate anion exchange resin having suspended therein a microcrystalline MgX 2 .2Al(OH) 3 structure, where X is a halide, which has had a portion of the MgX 2 removed by elution, 2. contacting a Mg ++ -containing brine with said resin, thereby enriching said resin with Mg ++ values from said brine, and 3. separating said resin, now enriched with Mg ++ values, from said brine.
Claim 7
Dependent Claim
32 words
The process of claim 1 wherein the resin is recycled a plurality of times by taking the resin from step 3 and repeating steps 1, 2, and 3 a plurality of times.
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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |