GB644528A - Improvements in or relating to the production of non-volatile organo-silicic oils - Google Patents
Improvements in or relating to the production of non-volatile organo-silicic oilsInfo
- Publication number
- GB644528A GB644528A GB14165/48A GB1416548A GB644528A GB 644528 A GB644528 A GB 644528A GB 14165/48 A GB14165/48 A GB 14165/48A GB 1416548 A GB1416548 A GB 1416548A GB 644528 A GB644528 A GB 644528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- sulphuric acid
- acid
- reacted
- oil
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
Landscapes
- Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
Non-volatile organo-silicic oils are made by reacting sulphuric acid of concentration 50 to 85 per cent with methylhalogenosilanes having a mean CH3/Si ratio of 2 to 2.6, separating the oil and freeing it from volatile constituents. Crude dimethyldichlorosilane may be used, or mixtures having the appropriate CH3/Si ratio. In contrast to the result when using sulphuric acid of more than 85 per cent concentration, as in Specification 622,129, the reacted mixture separates into two layers, an upper one containing hexamethyldisiloxane and a high proportion of a viscous oil and a lower acid layer, which when 75 to 85 per cent acid is used may retain some siloxanes which may be separated by dilution or extraction. Sulphuric acid of at least 60 per cent is preferably used to minimise solution therein of the hydrochloric acid which is evolved in gaseous form. In examples: (1) methylchlorsilane (48.2 per cent chlorine; CH3/Si, 2.34) is reacted with 73 per cent sulphuric acid, the oily layer, after mixing with ligroin, being decanted, washed in water and dilute ammonia, the ligroin evaporated and then distilled under reduced pressure to give volatile products and an oil; (2) and (3) methylchlorsilane is reacted with 72 and 69 per cent sulphuric acid.ALSO:Non-volatile organo-silicic oils are made by reacting sulphuric acid of concentration 50 to 85 per cent with methylhalogenosilanes having a mean CH3/Si ratio of 2 to 2.6, separating the oil and freeing it from volatile constituents. Crude dimethyldichlorsilane may be used, or mixtures having the appropriate CH3/Si ratio. In contrast to the result when using sulphuric acid of more than 85 per cent concentration, as in Specification 622,129, the reacted mixture separates into two layers, the upper one containing hexamethyldisiloxane and a high proportion of a viscous oil. With 75 to 85 per cent acid, the sulphuric acid layer may retain some siloxanes which may be separated by dilution or extraction. The HCl is evolved in gaseous form and acid of at least 60 per cent is preferably used to minimize its solution. In examples: (1) methylchlorsilane (48.2 per cent chlorine; CH3/Si, 2.34) is reacted with 73 per cent sulphuric acid, the oily layer, after mixing with ligroin, being decanted, washed in water and dilute ammonia, the ligroin evaporated and then distilled under reduced pressure to give volatile products and an oil; (2) and (3) methyl chlorsilane is reacted with 72 and 69 per cent sulphuric acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR644528X | 1947-07-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB644528A true GB644528A (en) | 1950-10-11 |
Family
ID=9000227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14165/48A Expired GB644528A (en) | 1947-07-23 | 1948-05-25 | Improvements in or relating to the production of non-volatile organo-silicic oils |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB644528A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3183254A (en) * | 1959-10-28 | 1965-05-11 | Goldschmidt Ag Th | Organic silicone compounds and method for producing same |
| CN110562923A (en) * | 2019-10-15 | 2019-12-13 | 杭州东日节能技术有限公司 | Analytical purification process and analytical purification device for diluted hydrochloric acid containing siloxane |
-
1948
- 1948-05-25 GB GB14165/48A patent/GB644528A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3183254A (en) * | 1959-10-28 | 1965-05-11 | Goldschmidt Ag Th | Organic silicone compounds and method for producing same |
| CN110562923A (en) * | 2019-10-15 | 2019-12-13 | 杭州东日节能技术有限公司 | Analytical purification process and analytical purification device for diluted hydrochloric acid containing siloxane |
| CN110562923B (en) * | 2019-10-15 | 2023-10-13 | 杭州东日节能技术有限公司 | Analysis and purification process and analysis and purification device for dilute hydrochloric acid containing siloxane |
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