US4392979A
Expired / Lapsed
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Magnesium aluminate anion exchangers
Assignee: Dow Chemical Co
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Filing: 1982-03-22
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Granted: 1983-07-12
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Expires: 2002-03-22
Abstract
Abstract Preparations and uses are shown for novel crystalline aluminates which conform generally to the empirical formula MgA.sub.a.sup.v Z.sub.b.sup.v.nAl(OH).sub.3.mH.sub.2 O where A and Z represent negative-valence ions or radicals selected from the group comprising hydroxyl, halide, inorganic acid, and organic acid, n is a value of from about 1 to about 2, v is a negative valence of 1, 2, or 3, a and b each have values of from zero to 2, with (va)+(vb) equal to 2, and with m being a value of zero or more.
Inventors
- 👤 John M. Lee
- 👤 William C. Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:41
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; B; B01; B01J; B01J41/00; B01J41/08; B01J47/00; B01J47/016; C01D; C01D3/00; C01D3/14; C01D3/145; C01F; C01F7/00; C01F7/78; C01F7/784; C01G; C01G37/00; C01G37/14; C01P; C01P2002/00; C01P2002/20; C01P2002/22
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
88 words
Crystalline magnesium aluminates conforming generally to the empirical formula MgA.sub.a.sup.v Z.sub.b.sup.v. nAl(OH).sub.3.mH.sub.2 O where A and Z represent negative-valence ions or radicals selected from the group comprising hydroxyl, halide, inorganic acid, and organic acid, n is a value of from about 1 to about 2, v is a negative valence of 1, 2, or 3, a is a value of from zero to 2, b is a value of from zero to 2, with (va)+(vb) equal to 2, and with m being a value of zero or more.
Claim 2
Dependent Claim
88 words
Crystalline magnesium aluminates conforming generally to the empirical formula MgA.sub.a.sup.v Z.sub.b.sup.v. nAl(OH).sub.3.mH.sub.2 O where A and Z represent negative-valence ions or radicals selected from the group comprising hydroxyl, halide, inorganic acid, and organic acid, n is a value of from about 1 to about 2, v is a negative valence of 1, 2, or 3, a is a value of from zero to 2, b is a value of from zero to 2, with (va)+(vb) equal to 2, and with m being a value of zero or more.
Claim 3
Dependent Claim
26 words
The compound of claim 1 wherein A is hydroxyl and Z is selected from the group comprising halide, inorganic acid, and organic acid ions or radicals.
Claim 4
Dependent Claim
13 words
The compound of claim 1 wherein both A and Z represent hydroxyl groups.
Claim 5
Dependent Claim
15 words
The compound of claim 1 wherein A represents hydroxyl groups and Z represents halide groups.
Claim 6
Dependent Claim
16 words
The compound of claim 1 wherein A represents hydroxyl groups and Z represents inorganic acid groups.
Claim 7
Dependent Claim
16 words
The compound of claim 1 wherein A represents hydroxyl groups and Z represents organic acid groups.
Claim 8
Dependent Claim
27 words
The compound of claim 1 wherein A and Z each represent different ions or radicals selected from the group comprising hydroxyl, halide, inorganic acid, and organic acid.
Claim 9
Dependent Claim
19 words
The compound of claim 1 wherein the AZ moiety represents the presence of divalent anions or divalent negative-valence radicals.
Claim 10
Dependent Claim
19 words
The compound of claim 1 wherein the AZ moiety represents the presence of trivalent anions or trivalent negative-valence radicals.
Claim 11
Dependent Claim
21 words
The compound of claim 1 wherein the AZ moiety represents the presence of the negative-valence organic acid group of 1-ascorbic acid.
Claim 12
Dependent Claim
13 words
The compound of claim 1 wherein the halide is chlorine, bromine, or iodine.
Claim 13
Dependent Claim
51 words
The compound of claim 1 wherein the inorganic acid group is at least one selected from the group consisting of ClO 4 - , SO 4 -- , NO 3 - , HPO 4 -- , H 2 PO 4 - , HCrO 4 - , and HCO 3 - .
Claim 14
Dependent Claim
60 words
The compound of claim 1 wherein the organic acid moeity is at least one selected from the group comprising carboxyl-containing radicals of mono, di, and tri-basic organic acids having up to about 8 carbon atoms in the radical and having a negative-valence of 1, 2, or 3 corresponding to the number of carboxyl groups present in the organic acid moiety.
Claim 15
Dependent Claim
77 words
A method for preparing the compounds of claim 1 which method comprises, contacting crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O, where n is a value of from about 1 to about 2 and m is a value of zero or more, with an aqueous medium containing negative-valent ions or radicals of the group comprising halide, inorganic acid, and organic acid, thereby replacing at least part of the OH groups with the said negative-valent ions or radicals.
Claim 16
Independent Claim
64 words
A method for preparing crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O, where n is a value of from about 1 to about 2 and m is a value of zero or more, said method comprising reacting crystalline MgX 2 .2Al(OH) 3 , where X is halide, with NaOH in aqueous medium, thereby replacing at least part of the halide groups with hydroxyl groups.
Claim 17
Independent Claim
64 words
A method for preparing crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O, where n is a value of from about 1 to about 2 and m is a value of zero or more, said method comprising reacting crystalline MgX 2 .2Al(OH) 3 , where X is halide, with NaOH in aqueous medium, thereby replacing at least part of the halide groups with hydroxyl groups.
Claim 18
Dependent Claim
34 words
A composition of matter comprising crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O, where n is a value of about 1 to about 2 and where m is a value of zero or more.
Claim 19
Dependent Claim
34 words
A composition of matter comprising crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O, where n is a value of about 1 to about 2 and where m is a value of zero or more.
Claim 20
Dependent Claim
12 words
The composition of claim 1 or 16 when supported by a substrate.
Claim 21
Dependent Claim
15 words
The composition of claim 1 or 16 when supported by a porous or reticular substrate.
Claim 22
Dependent Claim
13 words
The composition of claim 1 or 16 when supported by an inorganic substrate.
Claim 23
Dependent Claim
15 words
The composition of claim 1 or 16 when supported by an organic or polymeric substrate.
Claim 24
Dependent Claim
14 words
The composition of claim 1 or 16 when supported by an ion exchange resin.
Claim 25
Dependent Claim
13 words
The composition of claim 1 or 16 when dispersed in a liquid medium.
Claim 26
Dependent Claim
13 words
The composition of claim 1 or 16 when dispersed in an aqueous medium.
Claim 27
Dependent Claim
21 words
The composition of claim 1 or 16 when supported on a substrate and the substrate is, itself, in a liquid medium.
Claim 28
Dependent Claim
12 words
The composition of claim 24 where the liquid is an aqueous medium.
Claim 29
Dependent Claim
51 words
A process for preparing crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O where n is a value of from about 1 to about 2 and m is a value of zero or more, said processing comprising reacting amorphous Al(OH) 3 with Mg(OH) 2 at elevated temperature in an alkaline aqueous medium.
Claim 30
Dependent Claim
51 words
A process for preparing crystalline Mg(OH) 2 .nAl(OH) 3 .mH 2 O where n is a value of from about 1 to about 2 and m is a value of zero or more, said processing comprising reacting amorphous Al(OH) 3 with Mg(OH) 2 at elevated temperature in an alkaline aqueous medium.
Claim 31
Dependent Claim
29 words
The process of claim 26 wherein the alkaline aqueous medium contains a substrate material onto which, and/or within which, the Mg(OH) 2 .nAl(OH) 3 .mH 2 O is formed.
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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |