Patent US4329328A successfully refreshed from Google Patents.
US4329328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of synthesizing zincosilicate or stannosilicate or titanosilicate material
Assignee: National Research Development Corp UK
•
Filing: 1980-10-16
•
Granted: 1982-05-11
•
Expires: 2000-10-16
Abstract
Abstract Sodium zinco/stanno/titano-silicate is synthesized by mixing a concentrated aqueous sodium zincate, stannate or titanate solution with a source of silica (e.g. powdered glass or sodium metasilicate solution) in the ratio 60 g sodium silicate to sodium zincate equivalent to 8.1 g zinc oxide, keeping the temperature at 40° C. for 1/2 hour, diluting threefold with water of 20° C., allowing a precipitate to form overnight, and filtering and drying the residue at 110° C. The resulting sodium zincosilicate may be used in its own right as a water softener or may be converted by cation exchange into any other desired zincosilicate.
Inventors
- 👤 Patrick McAnespie
- 👤 Alan Dyer
- 👤 Bharati J. Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:54
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/12; C11D3/124; C11D3/1246; B; B01; B01J; B01J23/00; B01J23/06; B01J23/14; B01J29/00; B01J29/04; B01J29/89; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B39/00; C01B39/02; C01B39/06; C01B39/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A method of synthesising a zincosilicate, stannosilicate or titanosilicate, comprising mixing an aqueous sodium zincate, stannate or titanate solution of concentration at least 0.5 M (in ZnO, SnO or TiO) with a source of silica in the molar ratio silica (as SiO 2 ):sodium zincate, stannate or titanate (as ZnO, SnO or TiO) of 3.3:1 to 1:5.5 and maintaining the mixture at a reaction temperature of from 15° C. to 100° C. for at least 1/2 hour, diluting the mixture at least twofold, allowing a precipitate to form and removing supernatant liquid therefrom and drying the residue.
Claim 2
Independent Claim
97 words
A method of synthesising a zincosilicate, stannosilicate or titanosilicate, comprising mixing an aqueous sodium zincate, stannate or titanate solution of concentration at least 0.5 M (in ZnO, SnO or TiO) with a source of silica in the molar ratio silica (as SiO 2 ):sodium zincate, stannate or titanate (as ZnO, SnO or TiO) of 3.3:1 to 1:5.5 and maintaining the mixture at a reaction temperature of from 15° C. to 100° C. for at least 1/2 hour, diluting the mixture at least twofold, allowing a precipitate to form and removing supernatant liquid therefrom and drying the residue.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the source of silica is a silicate.
Claim 4
Dependent Claim
19 words
A method according to claim 2, wherein the source of silica is an aqueous solution of sodium metasilicate pentahydrate.
Claim 5
Dependent Claim
20 words
A method according to claim 3, wherein the sodium metasilicate solution is of a concentration from 10 to 15 g/l.
Claim 6
Dependent Claim
35 words
A method according to claim 3, wherein the source of silica further comprises sodium disilicate solution, which is added after the sodium metasilicate solution has been mixed with the sodium zincate stannate or titanate solution.
Claim 7
Dependent Claim
21 words
A method according to claim 5, wherein the ratio of metasilicate:disilicate in the source of silica is from 1:6 to 1:9.
Claim 8
Dependent Claim
17 words
A method according to claim 1, wherein the reaction temperature is from 30° C. to 80° C.
Claim 9
Dependent Claim
17 words
A method according to claim 1, wherein the reaction temperature is from 80° C. to 100° C.
Claim 10
Dependent Claim
23 words
A method according to claim 1, wherein the mixture is maintained at the reaction temperature for a duration of up to 24 hours.
Claim 11
Dependent Claim
17 words
A method according to claim 9, wherein the said duration is from 20 minutes to 6 hours.
Claim 12
Dependent Claim
17 words
A method according to claim 1, wherein the silica:zincate, stannate or titanate ratio is 1:3.5 to 1:5.5.
Claim 13
Dependent Claim
24 words
A method according to claim 1, wherein the dilution of the mixture is with water of a temperature of 15° C. to 40° C.
Claim 14
Dependent Claim
39 words
A method of synthesising a substituted zincosilicate, stannosilicate or titanosilicate, comprising making sodium zincosilicate, stannosilicate or titanosilicate by the method according to claim 1 and contacting it with a non-sodium salt until the non-sodium cation exchanges with the sodium.
Claim 15
Dependent Claim
25 words
A method of making catalyst or catalyst support comprising making a zincosilicate, stannosilicate or titanosilicate by the method according to claim 13, and calcining it.
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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |