US4929431A
Expired / Lapsed
US
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Process for producing amorphous aluminosilicates
Assignee: Kanebo Gohsen Ltd
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Filing: 1987-08-10
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Granted: 1990-05-29
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Expires: 2007-08-10
Abstract
Abstract There is disclosed a process for producing an amorphous aluminosilicate having the formula: 2NaxO.Al2O3.ySiO2 (wherein x is a number between 0.6 and 1.8 inclusive; and y is a number between 1.3 and 7 inclusive); which comprises: a step of maintaining an alkali solution (Solution-C), the alkalinity of which is within the range of 1.2-3.5N under stirring; a step of adding a sodium aluminate solution (Solution-A) containing free alkali and sodium silicate solution or colloidal silica solution (Solution-B) containing free alkali to the Solution-C, separately to prepare a slurry which contains an amorphous sodium aluminosilicate in the form of finely divided particles which are only slightly soluble in water; and a step of aging the slurry, characterized in that the addition of Solution-A and Solution-B into Solution-C is carried out so that the Si/Al ratio in the resultant mixture is kept within the range of 0.7 to 7.6 during and after the addition, and mixing effected at 55 DEG C. or lower, and Solution-A and Solution-B are prepared so that both the alkalinity of the aqueous solution phase during the formation of the slurry and during the maturing is kept within +/-0.30N of the alkalinity of Solution-C.
Inventors
- 👤 Zenji Hagiwara
- 👤 Satoshi Ando
- 👤 Saburo Nohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:13
CPC Classifications
B; B82; B82Y; B82Y30/00; A; A01; A01N; A01N59/00; A01N59/16; A01N59/18; A01N59/20; C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C08; C08K; C08K3/00; C08K3/34; C09; C09C; C09C1/00; C09C1/40; C09C1/405; C01P; C01P2002/00; C01P2002/02; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A process for producing an amorphous aluminosilicate having an average particle size of no larger 0.5 μm and a specific surface area of at least 5 m 2 /g having the formula: xNA.sub.2 O.Al.sub.2 O.sub.3.YSiO.sub.2 wherein x is a number between 0.6 and 1.8 inclusive; and y is a number between 1.3 and 7 inclusive; which comprises: maintaining an alkali solution (Solution-C), the alkalinity of which is within the range of 1.2-3.5 N under stirring; adding a sodium aluminate solution (Solution-A), containing free alkali, and sodium silicate solution or collodial silica solution (Solution-B) containing free alkali, to the Solution-C, separately to prepare a slurry which contains an amorphous sodium aluminosilicate in the form of finely divided particles which are only slightly soluble in water; and aging the slurry after completing said addition at 55° C. or lower for at least one hour until ripe, wherein the addition of Solution-A and Solution-B into Solution-C is carried out so that the Si/Al ratio in the resultant mixture is kept within the range of 0.7 to 7.6 during and after the addition, and mixing effected at 55° C. or lower, and Solution-A and Solution-B are prepared so that the alkalinity of the aqueous solution phase during the formation of the slurry and during the aging is kept within ±0.30 N of the alkalinity of Solution-C.
Claim 2
Dependent Claim
222 words
A process for producing an amorphous aluminosilicate having an average particle size of no larger 0.5 μm and a specific surface area of at least 5 m 2 /g having the formula: xNA.sub.2 O.Al.sub.2 O.sub.3.YSiO.sub.2 wherein x is a number between 0.6 and 1.8 inclusive; and y is a number between 1.3 and 7 inclusive; which comprises: maintaining an alkali solution (Solution-C), the alkalinity of which is within the range of 1.2-3.5 N under stirring; adding a sodium aluminate solution (Solution-A), containing free alkali, and sodium silicate solution or collodial silica solution (Solution-B) containing free alkali, to the Solution-C, separately to prepare a slurry which contains an amorphous sodium aluminosilicate in the form of finely divided particles which are only slightly soluble in water; and aging the slurry after completing said addition at 55° C. or lower for at least one hour until ripe, wherein the addition of Solution-A and Solution-B into Solution-C is carried out so that the Si/Al ratio in the resultant mixture is kept within the range of 0.7 to 7.6 during and after the addition, and mixing effected at 55° C. or lower, and Solution-A and Solution-B are prepared so that the alkalinity of the aqueous solution phase during the formation of the slurry and during the aging is kept within ±0.30 N of the alkalinity of Solution-C.
Claim 3
Dependent Claim
28 words
A process according to claim 1 wherein Solution-A, Solution-B and Solution-C are adjusted so that the alkalinity of the resulting slurry is within the range of 1.2-3.5 N.
Claim 4
Dependent Claim
30 words
A process according to claim 1 wherein Solution-A, Solution-B and Solution-C are adjusted so that the ratio of Na to Al in the slurry is within the range of 1.1-6.7.
Claim 5
Dependent Claim
90 words
A process for producing an amorphous aluminosilicate having the formula: ##STR10## wherein M is a member selected from the group consisting of potassium, lithium, calcium, magnesium, cobalt (II), iron (II), nickel (II) and ammonium ion; n is the valence of M; x is a number between 0.6 and 1.8 inclusive; and y is a number between 1.3 and 7 inclusive; which comprises ion-exchanging all or part of the Na in the sodium aluminosilicate of claim 1 with M by using a solution containing one or more of these metal ions.
Claim 6
Dependent Claim
16 words
The process of claim 1, wherein said aging is performed for from 1 to 5 hours.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |