US4418048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminophosphorus compounds
Assignee: Honeywell UOP LLC
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Filing: 1980-06-10
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Granted: 1983-11-29
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Expires: 2000-06-10
Abstract
Abstract The present invention provides the following: (a) An aluminophosphorus compound wherein the atomic ratio of P to Al exceeds 1:1 and having anion exchange properties. (b) A process for preparing such an aluminophosphorus compound comprising treating an aluminous compound, for example a zeolite, a clay, or alumina with a melt comprising a phosphate, for example ammonium dihydrogen orthophosphate, and removing excess phosphate from the compound thereby formed. (c) A process for at least partially removing anions from an aqueous solution which comprises contacting the aqueous solution containing the anions with the aluminophosphorus compound. (d) A process for the chromatographic separation of two anions in aqueous solution wherein the chromatographic stationary phase comprises the aluminophosphorus compound.
Inventors
- 👤 Alan Dyer
- 👤 Abraham Araya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/20; B01J41/08; B01J41/10; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/36; C01B33/00; C01B33/20; C01B33/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A process for the preparation of an anion exchanger comprising an aluminophosphorus compound comprising contacting an aluminous compound with an excess, over that required to form the aluminophosphorus compound, of an ammonium phosphate melt, thereafter dissolving the excess of phosphate used to form the melt in water or an aqueous solution and recovering the remaining crystalline water insoluble aluminophosphorus compound.
Claim 2
Dependent Claim
60 words
A process for the preparation of an anion exchanger comprising an aluminophosphorus compound comprising contacting an aluminous compound with an excess, over that required to form the aluminophosphorus compound, of an ammonium phosphate melt, thereafter dissolving the excess of phosphate used to form the melt in water or an aqueous solution and recovering the remaining crystalline water insoluble aluminophosphorus compound.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 wherein the aluminous compound is contacted with the melt for at least 5 hours.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 2 wherein the aluminous compound is contacted with the melt for at least 7 hours.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1 wherein the aluminous compound is a zeolite a clay or an alumina or a calcined derivative of any of the foregoing.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 1 wherein the aluminous compound is a zeolite having a SiO 2 to Al 2 O 3 ratio of from 1 to 10.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1 wherein the aluminous compound is a kaolin group clay or a calcined derivative thereof.
Claim 8
Dependent Claim
13 words
A process as claimed in claim 1 wherein the aluminous compound is alumina.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 1 wherein the phosphate is ammonium dihydrogen orthophosphate.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 1 wherein the phosphate is in an at least 3 fold weight excess over the aluminous compound.
Claim 11
Dependent Claim
25 words
A process as claimed in claim 1 wherein the melt has a temperature not more than 100° C. above the melting temperature of the phosphate.
Claim 12
Dependent Claim
46 words
A water insoluble crystalline anion exchanger comprising an aluminophosphorus compound consisting essentially of a cationic framework of aluminum, oxygen and phosphorus atoms, the ratio of the number of atoms of phosphorus to the number of atoms of aluminum being greater than 1:1, and, optionally, silicon atoms.
Claim 13
Dependent Claim
46 words
A water insoluble crystalline anion exchanger comprising an aluminophosphorus compound consisting essentially of a cationic framework of aluminum, oxygen and phosphorus atoms, the ratio of the number of atoms of phosphorus to the number of atoms of aluminum being greater than 1:1, and, optionally, silicon atoms.
Claim 14
Dependent Claim
16 words
A compound as claimed in claim 11 wherein the said ratio is from 1.5 to 3.
Claim 15
Dependent Claim
16 words
A compound as claimed in claim 12 wherein the said ratio is from 2 to 2.5.
Claim 16
Dependent Claim
10 words
A compound as claimed in claim 11 also containing silica.
Claim 17
Dependent Claim
19 words
A compound as claimed in claim 11 not containing structural or coordinated water as shown by infra-red absorbtion analysis.
Claim 18
Dependent Claim
69 words
A compound as claimed in claim 11 having an x-ray diffraction pattern showing lines at the following d-spacings: ______________________________________
d-spacings (A) Intensity
______________________________________
5.78 VS
5.25 W
4.84 W
4.15 M
3.90 S
3.37 W
3.12 W
2.94 VS
2.60 VW
2.47 VW
2.42 W
2.31 W
2.06 W
1.94 M
______________________________________
VS = very strong
S = strong
M = medium
W = weak
VW = very weak
References Cited (Backward Citations)
US2280848A
Cited
US2550490A
Cited
US3097949A
Cited
US3397142A
Cited
US3386801A
Cited
GB1242741A
Cited
DE2034266A1
Cited
US4147758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |