GB1295760A - - Google Patents
Info
- Publication number
- GB1295760A GB1295760A GB1295760DA GB1295760A GB 1295760 A GB1295760 A GB 1295760A GB 1295760D A GB1295760D A GB 1295760DA GB 1295760 A GB1295760 A GB 1295760A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reaction
- aqueous solution
- ammonium hydroxide
- sodium
- naf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/02—Fluorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/152—Preparation of hydrogels
- C01B33/1525—Preparation of hydrogels from or via fluosilicic acid or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/162—Ammonium fluoride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
- C01D1/24—Preparation by reacting oxides or hydroxides with alkali metal salts from or via fluorides or silico-fluorides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
1295760 Sodium flouride and silica gel ONODA CHEMICAL INDUSTRY CO Ltd 29 May 1970 [29 May 1969] 26108/70 Heading C1A Sodium fluoride and silica gel are produced by treating sodium fluorosilicate with an aqueous solution of ammonium hydroxide with vigorous agitation, the concentration of ammonium hydroxide in the reaction medium during the reaction being not greater than 5 wt. per cent and the total concentration of NH 4 <SP>+</SP> after completion of the reaction being more than 7À5% calculated as NH 3 . In an embodiment of the invention, as illustrated by Fig. I, sodium fluosilicate, either in aqueous solution or as a fine powder, is introduced into a reactive vessel simultaneously with an aqueous solution of ammonium hydroxide and the mixture in the vessel is stirred vigorously at an elevated temperature for about one hour. The slurry discharged from the reactor, after settling is separated in a levigation apparatus and the separated slurries of SiO 2 and NaF filtered, washed, and dried. The filtrate in each case is a solution of ammonium fluoride. The ammonium hydroxide cone. is selected to give a final conc. of NH 4 <SP>+</SP> after reaction greater than 7À5% and the conc. of free NH 3 during reaction is kept as low as possible. The slurry obtained from the process as described may be subsequently reacted with aqueous NaOH, Na 2 SO 4 , or NaCl to increase the yield of NaF and form an aqueous solution of NH 4 Cl, NH 4 OH or (NH 4 ) 2 SO 4 .
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4136069 | 1969-05-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1295760A true GB1295760A (en) | 1972-11-08 |
Family
ID=12606300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1295760D Expired GB1295760A (en) | 1969-05-29 | 1970-05-29 |
Country Status (11)
Country | Link |
---|---|
BE (1) | BE751090A (en) |
CA (1) | CA927575A (en) |
DE (1) | DE2026484C3 (en) |
ES (1) | ES380176A1 (en) |
FI (1) | FI55022C (en) |
FR (1) | FR2048948A5 (en) |
GB (1) | GB1295760A (en) |
IL (1) | IL34592A (en) |
NL (1) | NL145825B (en) |
PH (1) | PH9319A (en) |
ZA (1) | ZA703426B (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3000702A (en) * | 1958-05-23 | 1961-09-19 | Grace W R & Co | Manufacture of sodium fluoride |
-
1970
- 1970-05-20 ZA ZA703426A patent/ZA703426B/en unknown
- 1970-05-25 PH PH11475*UA patent/PH9319A/en unknown
- 1970-05-25 CA CA083653A patent/CA927575A/en not_active Expired
- 1970-05-25 IL IL34592A patent/IL34592A/en unknown
- 1970-05-27 FI FI1491/70A patent/FI55022C/en active
- 1970-05-28 FR FR7019600A patent/FR2048948A5/fr not_active Expired
- 1970-05-28 NL NL707007745A patent/NL145825B/en not_active IP Right Cessation
- 1970-05-28 BE BE751090D patent/BE751090A/en unknown
- 1970-05-29 DE DE2026484A patent/DE2026484C3/en not_active Expired
- 1970-05-29 GB GB1295760D patent/GB1295760A/en not_active Expired
- 1970-05-29 ES ES380176A patent/ES380176A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2048948A5 (en) | 1971-03-19 |
NL7007745A (en) | 1970-12-01 |
IL34592A0 (en) | 1970-07-19 |
BE751090A (en) | 1970-11-03 |
DE2026484C3 (en) | 1981-07-16 |
CA927575A (en) | 1973-06-05 |
DE2026484A1 (en) | 1971-04-01 |
FI55022C (en) | 1979-05-10 |
ZA703426B (en) | 1971-01-27 |
FI55022B (en) | 1979-01-31 |
NL145825B (en) | 1975-05-15 |
PH9319A (en) | 1975-08-22 |
DE2026484B2 (en) | 1980-06-19 |
IL34592A (en) | 1973-08-29 |
ES380176A1 (en) | 1973-04-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |