Patent EP0027736B1 successfully refreshed from Google Patents.
EP0027736B1
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EP
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Method of synthesising sodium zincosilicate and stannosilicate and ion-exchanged products thereof,detergent formulations containing the sodium zincosilicate or stannosilicate products and catalysts or catalyst supports containing the ion-exchanged products
Assignee: BTG International Ltd
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Filing: 1980-10-20
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Granted: 1985-01-02
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Expires: 2000-10-20
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 DEG C. for 1/2 hour, diluting threefold with water of 20 DEG C., allowing a precipitate to form overnight, and filtering and drying the residue at 110 DEG 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 Jayantilal Mehta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:17
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: 18
Claim 1
Independent Claim
99 words
A method of synthesising a sodium zincosilicate, which optionally thereafter is ion-exchanged to replace sodium cations by hydrogen, or inorganic or organic cations, characterised in that the method comprises mixing an aqueous sodium zincate solution of concentration at least 0.5 M (in ZnO) with a source of silica in the molar ratio silica (as Si0 2 ): sodium zincate (as ZnO) 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 4 hour, allowing a precipitate to form and removing supernatant liquid therefrom and drying the sodium zincosilicate residue.
Claim 2
Independent Claim
99 words
A method of synthesising a sodium zincosilicate, which optionally thereafter is ion-exchanged to replace sodium cations by hydrogen, or inorganic or organic cations, characterised in that the method comprises mixing an aqueous sodium zincate solution of concentration at least 0.5 M (in ZnO) with a source of silica in the molar ratio silica (as Si0 2 ): sodium zincate (as ZnO) 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 4 hour, allowing a precipitate to form and removing supernatant liquid therefrom and drying the sodium zincosilicate residue.
Claim 3
Independent Claim
102 words
A method of synthesising a sodium stannosilicate which optionally thereafter is ion-exchanged to replace sodium cations by hydrogen or inorganic or organic cations, characterised in that the method comprises mixing an aqueous sodium stannate solution of concentration at least 0.5 M (in SnO 2 ) with a source of silica in the molar ratio silica (as SiO 2 ):sodium stannate (as SnO 2 ) 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 t hour, allowing a precipitate to form and removing supernatant liquid therefrom and drying the sodium stannosilicate residue.
Claim 4
Independent Claim
102 words
A method of synthesising a sodium stannosilicate which optionally thereafter is ion-exchanged to replace sodium cations by hydrogen or inorganic or organic cations, characterised in that the method comprises mixing an aqueous sodium stannate solution of concentration at least 0.5 M (in SnO 2 ) with a source of silica in the molar ratio silica (as SiO 2 ):sodium stannate (as SnO 2 ) 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 t hour, allowing a precipitate to form and removing supernatant liquid therefrom and drying the sodium stannosilicate residue.
Claim 5
Dependent Claim
25 words
A method according to Claim 1 or 2 wherein the molar ratio SiO 2 :ZnO or SiO 2 :SnO 2 is from 1:3.5 to 1:5.5.
Claim 6
Dependent Claim
17 words
A method according to Claim 1, 2 or 3 wherein the source of silica is a silicate.
Claim 7
Dependent Claim
19 words
A method according to Claim 4, wherein the source of silica comprises an aqueous solution of sodium metasilicate pentahydrate.
Claim 8
Dependent Claim
20 words
A method according to Claim 5, wherein the sodium metasilicate solution is of a concentration from 10 to 15 g/I.
Claim 9
Dependent Claim
36 words
A method according to Claim 5 or 6, 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 or stannate solution.
Claim 10
Dependent Claim
22 words
A method according to Claim 7, wherein the weight ratio of metasilicate:disilicate in the source of silica is from 1:6 to 1:9.
Claim 11
Independent Claim
27 words
A method according to any preceding claim, wherein the reaction temperature at which the mixture is maintained is from 30°C to 80°C or from 80°C to 100°C.
Claim 12
Independent Claim
21 words
A method according to any preceding claim, wherein the mixture is maintained at the reaction temperature for up to 24 hours.
Claim 13
Independent Claim
40 words
A method according to any preceding claim wherein after the mixture has been maintained at the reaction temperature for at least 4 hour, it is diluted at least two-fold and the precipitate is allowed to form from the diluted mixture.
Claim 14
Dependent Claim
22 words
A method according to Claim 11, wherein the dilution of the mixture is with water of a temperature of 15°C to 40°C.
Claim 15
Dependent Claim
30 words
Sodium zincosilicate or stannosilicate which is capable of preferentially taking up magnesium in- the presence of calcium and which has been synthesised by a method according to any preceding claim.
Claim 16
Dependent Claim
12 words
A detergent formulation comprising sodium zincosilicate or stannosilicate according to Claim 13.
Claim 17
Dependent Claim
18 words
An ion-exchanged zincosilicate or stannosilicate synthesised by a method according to any one of Claims 1 to 12.
Claim 18
Dependent Claim
19 words
A catalyst or catalyst support comprising an ion-exchanged zincosilicate or stannosilicate according to Claim 15, which has been calcined.
References Cited (Backward Citations)
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