Patent US5619906A successfully refreshed from Google Patents.
Patent US4357147A successfully refreshed from Google Patents.
Patent US5085845A successfully refreshed from Google Patents.
US5085845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and use of crystalline hydrogen-phosphate compounds having layer structure
Assignee: Tayca Corp
•
Filing: 1990-10-25
•
Granted: 1992-02-04
•
Expires: 2010-10-25
Abstract
Abstract A process for preparing a crystalline layered hydrogenphosphate in a shortened period of time in high efficiency, which comprises reacting a tetravalent metal compound with phosphoric acid or its salt at an elevated temperature with introducing steam into the reaction system. Crystalline layered cerium(IV) bis(hydrogen-phosphate), particularly cerium(IV) bis(hydrogen-phosphate) dihydrate prepared by the above process, has an excellent ability of selectively adsorbing cesium ion, and is useful as a cesium ion adsorbent.
Inventors
- 👤 Shiunkichi Ueda
- 👤 Tomoe Suita
- 👤 Masahiko Murakami
- 👤 Mitsutomo Tsuhako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:55
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; B; B01; B01J; B01J20/00; B01J20/02; B01J20/0203; B01J20/0207; B01J20/0211; B01J20/0248; B01J20/0251; B01J20/0274; B01J20/0292; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/37; C01B25/372; C01D; C01D17/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
A process for preparing a crystalline layered hydrogenphosphate which comprises reacting a tetravalent metal compound and a phosphoric acid source at an elevated temperature while introducing steam into the reaction system from outside the reaction system.
Claim 2
Dependent Claim
36 words
A process for preparing a crystalline layered hydrogenphosphate which comprises reacting a tetravalent metal compound and a phosphoric acid source at an elevated temperature while introducing steam into the reaction system from outside the reaction system.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein the reaction is carried out at a temperature of 80° to 300° C.
Claim 4
Dependent Claim
42 words
The process of claim 1, wherein said phosphoric acid source and said tetravalent metal compound are present in a ratio of 0.5/1.0 to 2.5/1.0 by mole in terms of P 2 O 5 /MO 2 where M is a tetravalent metal element.
Claim 5
Dependent Claim
52 words
The process of claim 1, wherein said tetravalent metal compound is at least one member selected from the group consisting of an oxide, hydroxide, carbonate, sulfate, nitrate and chloride of at least one metal element selected from the group consisting of cerium and metal elements of Group IV of the Periodic Table.
Claim 6
Dependent Claim
27 words
The process of claim 1, wherein said phosphoric acid source is at least one member selected from the group consisting of phosphoric acid and phosphoric acid salts.
Claim 7
Dependent Claim
27 words
The process of claim 1, wherein said tetravalent metal compound is a water-insoluble solid powder, and it is mixed with phosphoric acid and subjected to the reaction.
Claim 8
Dependent Claim
30 words
The process of claim 1, wherein said tetravalent metal compound is a water-insoluble solid powder, and an aqueous slurry thereof is mixed with phosphoric acid and subjected to the reaction.
Claim 9
Dependent Claim
42 words
The process of claim 1, wherein said tetravalent metal compound is a water-soluble compound, and an aqueous solution thereof is mixed with phosphoric acid or an aqueous solution of a phosphoric acid salt and the resulting precipitate is subjected to the reaction.
Claim 10
Dependent Claim
44 words
A process for preparing a crystalline layered hydrogenphosphate which comprises reacting a tetravalent metal compound and a phosphoric acid source at an elevated temperature while introducing a sufficient amount of steam for accelerating the reaction into the reaction system from outside the reaction system.
Claim 11
Dependent Claim
44 words
A process for preparing a crystalline layered hydrogenphosphate which comprises reacting a tetravalent metal compound and a phosphoric acid source at an elevated temperature while introducing a sufficient amount of steam for accelerating the reaction into the reaction system from outside the reaction system.
References Cited (Backward Citations)
US3416884A
Cited
US4826663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |