Claims
- 1. A method of preparing a crystalline silicate composition which comprises:
- (a) preparing a first mixture comprising a tetraalkyl ammonium salt, alkali metal hydroxide, silica and water,
- (b) preparing a second mixture comprising water, a soluble source of a metal whose hydroxide precipitates at a pH above 7 and an amount of urea or a compound which upon hydrolysis releases ammonia, said amount effective to precipitate the hydroxide of said metal,
- (c) admixing an amount of said first mixture and an amount of said second mixture effective to provide a reaction mixture having an aluminum content of less than about 100 wppm (based on silica) and having a composition in terms of mole ratios of oxides, falling within the following ranges:
- ______________________________________OH.sup.- /SiO.sub.2 0.05-3Q.sup.+ /(Q.sup.+ + A.sup.+) 0.01-1H.sub.2 O/OH.sup.- 10-800SiO.sub.2 /M.sub.2/m O 10-10,000______________________________________
- wherein Q.sup.+ is tetralkyl ammonium ion, A.sup.+ is alkali metal ion, M is said metal and m is the valence of said metal, whereby the hydroxide of said metal forms a precipitate,
- (d) maintaining the reaction mixture at a temperature of about 50.degree. to about 250.degree. C. until crystals of metal silicate are formed and
- (e) separating and recovering said crystals.
- 2. A method according to claim 1 wherein a soluble boron compound is admixed with said first mixture and wherein the mole ratios of oxides in said reaction mixture has an additional mole ratio range of
- SiO.sub.2 /B.sub.2 O.sub.3 : 2-1000.
- 3. A method according to claim 1 wherein the metal is iron, cobalt, bismuth, chromium, molybdenum, nickel, tin, platinum or mixtures thereof.
- 4. A method according to claim 1 wherein the first mixture of step (a) additionally comprises sulfuric acid and sodium chloride and step (d) is conducted under refluxing conditions.
- 5. A method of preparing a crystalline silicate composition which comprises:
- (a) preparing a first mixture comprising a tetraalkyl ammonium salt, alkali metal hydroxide, silica and water,
- (b) preparing a second mixture comprising water, a soluble source of a metal whose hydroxide precipitates at a pH above 7 and an amount of urea or a compound which upon hydrolysis releases ammonia, said amount effective to precipitate the hydroxide of said metal,
- (c) maintaining said second mixture under conditions effective to cause the hydroxide of the metal to precipitate,
- (d) admixing an amount of said first mixture and an amount of said second mixture effective to provide a reaction mixture having an aluminum content of less than about 100 wppm (based on silica) and having a composition in terms of mole ratios of oxides, falling within the following ranges:
- ______________________________________OH.sup.- /SiO.sub.2 0.05-3Q.sup.+ /(Q.sup.+ + A.sup.+) 0.01-1H.sub.2 O/OH.sup.- 10-800SiO.sub.2 /M.sub.2/m O 10-10,000______________________________________
- wherein Q.sup.+ is tetralkyl ammonium ion, A.sup.+ is alkali metal ion, M is said metal and m is the valence of said metal,
- (e) maintaining the reaction mixture at a temperature of about 50.degree. to about 250.degree. C. until crystals of metal silicate are formed and
- (f) separating and recovering said crystals.
- 6. A method according to claim 5 wherein a soluble boron compound is admixed with said first mixture and wherein the mole ratios of oxides in said reaction mixture has an additional mole ratio range of
- SiO.sub.2 /B.sub.2 O.sub.3 : 2-1000.
- 7. A method according to claim 6 wherein the metal is iron, cobalt, bismuth, chromium, molybdenum, nickel, tin platinum or mixtures thereof.
- 8. A method according to claim 5 wherein the first mixture of step (a) additionally comprises sulfuric acid and sodium chloride and step (c) and (e) are conducted under refluxing conditions.
- 9. A method according to claim 5 wherein the metal is iron.
- 10. A method according to claim 9 further containing a boron compound in the first mixture.
Priority Claims (1)
Number |
Date |
Country |
Kind |
363052 |
Oct 1980 |
CAX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 256,304, filed Apr. 22, 1981, now abandoned, which application is a continuation-in-part of Ser. No. 092,127, filed Nov. 7, 1979, now U.S. Pat. No. 4,331,641.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2831611 |
Feb 1980 |
DEX |
2024790 |
Jan 1980 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
256304 |
Apr 1981 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
92127 |
Nov 1979 |
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