GB852550A - A method of producing very pure silica - Google Patents
A method of producing very pure silicaInfo
- Publication number
- GB852550A GB852550A GB8114/58A GB811458A GB852550A GB 852550 A GB852550 A GB 852550A GB 8114/58 A GB8114/58 A GB 8114/58A GB 811458 A GB811458 A GB 811458A GB 852550 A GB852550 A GB 852550A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ether
- methanol
- silica
- impurity
- extracting
- 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
- 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
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
<PICT:0852550/III/1> Hydrated silica containing boric and/or phosphoric acid as impurity, e.g. as produced by the hydrolysis of silicon tetrachloride, is freed from said impurity by extracting with a mixture of methanol and a water-immiscible ether e.g. isopropyl ether, and recycling the solvent to the extraction step after purification by distillation. The solvent may be distilled in the presence of solid sodium or potassium hydroxide to prevent formation of methyl borate. The process may be commenced by extracting an aqueous methanol suspension of hydrated silica containing 30-60% of methanol with the ether. The silica may be purified so as to contain less than 10-6% of boron and/or phosphorus. The purified silica may be dried, calcined, and fused to form a crucible for use in the production of pure silicon crystals. As shown an extraction apparatus comprises a distillation flask 4 containing a quantity of alkali metal hydroxide 7, a reflux condenser 1, a return tube 3, an extraction tube 8, and a stirrer 5.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE852550X | 1957-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB852550A true GB852550A (en) | 1960-10-26 |
Family
ID=6784971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8114/58A Expired GB852550A (en) | 1957-03-13 | 1958-03-13 | A method of producing very pure silica |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB852550A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2122588A (en) * | 1982-06-26 | 1984-01-18 | Unilever Plc | Regenerating spent adsorbents |
| GB2122589A (en) * | 1982-06-26 | 1984-01-18 | Unilever Plc | Regeneration of spent adsorbents |
-
1958
- 1958-03-13 GB GB8114/58A patent/GB852550A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2122588A (en) * | 1982-06-26 | 1984-01-18 | Unilever Plc | Regenerating spent adsorbents |
| GB2122589A (en) * | 1982-06-26 | 1984-01-18 | Unilever Plc | Regeneration of spent adsorbents |
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