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US5643358A
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Crystalline hydrated layered sodium and potassium silicates and method of producing same
Assignee: PQ Corp
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Filing: 1994-11-03
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Granted: 1997-07-01
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Expires: 2014-11-03
Abstract
Abstract The present invention pertains to a crystalline hydrated layered sodium and potassium silicate/amorphous sodium and potassium silicate composite material with predetermined hardness ion sequestration properties achieved by controlling the process for forming the material. The process for producing the crystalline hydrated layered sodium and potassium silicate/amorphous sodium and potassium silicate composite comprises hydrolyzing DB-1 crystalline sodium and potassium silicate glasses as a precursor material to produce the composite material known as DB-2. Hydrolysis of the DB-1 precursor material is achieved by adding typically up to 100.0 milliequivalents per gram of H 3 O + ions or up to 50 milliequivalents per gram of OH - ions. The resulting DB-2 material can sequester CA 2+ ions, Mg + ions, or both, depending on the results desired, processing conditions, and starting materials used.
Inventors
- 👤 Eric von Rehren Borgstedt
- 👤 Raymond P. Denkewicz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:47
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/08; C11D3/12; C11D3/124; C11D3/1246; C11D3/1253; C11D3/1273
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
98 words
A process for the production of a composite product including a crystalline hydrated layered sodium and potassium silicate and an amorphous sodium and potassium silicate comprising: producing a material including a crystalline disilicate having both sodium and potassium silicate by heating an alkali silicate for a time, and at a temperature sufficient to crystallize at least a portion of said material; slurrying said resulting solid material with a hydrolyzing agent selected to provide hydrolyzing ions selected from H 3 O + and OH - to produce a composite product; and separating said composite product from said hydrolyzing agent.
Claim 2
Dependent Claim
98 words
A process for the production of a composite product including a crystalline hydrated layered sodium and potassium silicate and an amorphous sodium and potassium silicate comprising: producing a material including a crystalline disilicate having both sodium and potassium silicate by heating an alkali silicate for a time, and at a temperature sufficient to crystallize at least a portion of said material; slurrying said resulting solid material with a hydrolyzing agent selected to provide hydrolyzing ions selected from H 3 O + and OH - to produce a composite product; and separating said composite product from said hydrolyzing agent.
Claim 3
Dependent Claim
28 words
The process of claim 1, wherein said hydrolyzing agent is used in an amount calculated to provide up to 75 milliequivalents of hydrolyzing ions per gram of material.
Claim 4
Dependent Claim
47 words
The process of claim 1 wherein the step of producing a material including a crystalline alkali disilicate by heating an alkali silicate comprises: combining an alkali silicate glass having both sodium and postassium silicate and water to form a mixture; and heating said glass and water mixture.
Claim 5
Dependent Claim
40 words
The process of claim 1 wherein the step of producing a material including a crystalline alkali disilicate by heating an alkali silicate comprises: combining a sodium silicate glass and a potassium source to form a mixture; and heating said mixture.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said potassium source is potassium hydroxide.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein said including the further step of spray drying said hydrolyzed material.
Claim 8
Dependent Claim
24 words
A crystalline hydrated layered alkali silicate/amorphous alkali silicate composite including the DB-2 crystalline phase potassium/sodium crystalline material produced by the process of claim 1.
Claim 9
Dependent Claim
29 words
The crystalline hydrated layered alkali silicate/amorphous alkali silicate composite of claim 7 wherein said alkali includes up to 20 mole percent potassium, and at least 80 mole percent sodium.
Claim 10
Dependent Claim
27 words
The product produced by the process of claim 1 wherein said alkali silicate includes up to 20 mole percent potassium, and at least 80 mole percent sodium.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the ratio of silicate to alkali in said sodium and potassium silicate is between 1.7 and 3.22.
Claim 12
Dependent Claim
17 words
The crystalline hydrated layered alkali silicate/amorphous alkali silicate composite product produced by the process of claim 1.
Claim 13
Dependent Claim
17 words
The crystalline hydrated layered alkali silicate/amorphous alkali silicate composite product produced by the process of claim 4.
Claim 14
Dependent Claim
17 words
The crystalline hydrated layered alkali silicate/amorphous alkali silicate composite product produced by the process of claim 6.
Claim 15
Dependent Claim
48 words
The composite product of claim 11 wherein said composite product has a silica:alkali ratio between 2.75 and 4.25 and a hardness ion binding capacity of up to 6.1 milliequivalents Ca 2+ per gram of anhydrous product and up to 7.0 milliequivalents Mg 2+ per gram of anhydrous product.
Claim 16
Dependent Claim
48 words
The composite product of claim 11 wherein said composite product has a silica:alkali ratio between 2.9 and 5.5 and a hardness ion binding capacity of up to 6.2 milliequivalents Ca 2+ per gram of anhydrous product and up to 5.9 milliequivalents Mg 2+ per gram of anhydrous product.
Claim 17
Dependent Claim
48 words
The composite product of claim 11 wherein said composite product has a silica:alkali ratio between 4.25 and 8.75 and a hardness ion binding capacity of up to 5.9 milliequivalents Ca 2+ per gram of anhydrous product and up to 3.0 milliequivalents Mg 2+ per gram of anhydrous product.
Claim 18
Dependent Claim
48 words
The composite product of claim 11 wherein said composite product has a silica:alkali ratio between 2.1 and 2.9 and a hardness ion binding capacity of up to 5.9 milliequivalents Ca 2+ per gram of anhydrous product and up to 7.1 milliequivalents Mg 2+ per gram of anhydrous product.
Claim 19
Dependent Claim
48 words
The composite product of claim 12 wherein said composite product has a silica:alkali ratio between 2.9 and 13.5 and a hardness ion binding capacity of up to 5.9 milliequivalents Ca 2+ per gram of anhydrous product and up to 6.8 milliequivalents Mg 2+ per gram of anhydrous. product.
Claim 20
Dependent Claim
48 words
The composite product of claim 11 wherein said composite product has a silica:alkali ratio between 1.7 and 3.22 and a hardness ion binding capacity of up to 7.0 milliequivalents Ca 2+ per gram of anhydrous product and up to 8.7 milliequivalents Mg 2+ per gram of anhydrous. product.
Claim 21
Dependent Claim
56 words
A crystalline hydrated layered alkali silicate/amorphous alkali silicate composite including the crystalline phase potassium/sodium crystalline material produced by the process of claim 1, wherein said crystalline material has an X-ray diffraction pattern having d-spacings of 10.30 Å, 5.13 Å, 4.02 Å, 3.63 Å, 3.43 Å, 3.16 Å, 3.09 Å, 2.47 Å, 2.42 Å, and 2.09 Å.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |