GB1262571A - Process for the continuous production of pure concentrated hydrofluoric acid from impure fluosilicic acid - Google Patents
Process for the continuous production of pure concentrated hydrofluoric acid from impure fluosilicic acidInfo
- Publication number
- GB1262571A GB1262571A GB832269A GB832269A GB1262571A GB 1262571 A GB1262571 A GB 1262571A GB 832269 A GB832269 A GB 832269A GB 832269 A GB832269 A GB 832269A GB 1262571 A GB1262571 A GB 1262571A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- absorbent
- solvent
- stripping
- vapour
- 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
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/193—Preparation from silicon tetrafluoride, fluosilicic acid or fluosilicates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
1,262,571. Hydrofluoric acid. BUSS A.G. 15 Feb., 1969, No. 8322/69. Heading C1A. Hydrogen fluoride is recovered from hydrofluosilicic acid by (a) mixing therewith (in 2) water and silicon tetrafluoride recycled from (c) (through line 3), (b) thermally hydrolysing the mixture (in 4) to give water vapour, HF vapour, gaseous SiF 4 and by-product Si(OH) 4 , (c) superheating the vapours (in 11) and before the SiF 4 and water recombine, contacting them countercurrently (in 13) with a hot absorbent selective for HF, (d) externally heating the absorption zone (13), (e) contacting the HF- loaded absorbent with liquid HF-water azeotrope (introduced from line 15 into 14) whereby the water boils off and (f) stripping HF from the loaded absorbent (in 17) and recycling said absorbent (through line 18). Stripping may be effected by countercurrently contacting the loaded absorbent with a vapour phase stripping solvent (27) or by means of a subatmospheric pressure. As shown in the Figure, to which the numerals relate, the HF-loaded stripping solvent is passed to heat exchanger 20 and by means of further cooling in the sump, solvent 33 and HF containing minor amounts of water separate into layers. The solvent is recycled via evaporator 34 and the HF rectified in column 21 to give anhydrous vapours, which are condensed at 26, and azeotrope 23 for recycling to 14. Specified absorbents are polyethers, polyalcohols and/or polyglycols if desired together with diphenyl oxide or naphthalene. Specified solvents are water vapour mixed with heptane or nonane. Canadian Specification 713,982 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB832269A GB1262571A (en) | 1969-02-15 | 1969-02-15 | Process for the continuous production of pure concentrated hydrofluoric acid from impure fluosilicic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB832269A GB1262571A (en) | 1969-02-15 | 1969-02-15 | Process for the continuous production of pure concentrated hydrofluoric acid from impure fluosilicic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1262571A true GB1262571A (en) | 1972-02-02 |
Family
ID=9850316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB832269A Expired GB1262571A (en) | 1969-02-15 | 1969-02-15 | Process for the continuous production of pure concentrated hydrofluoric acid from impure fluosilicic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1262571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233422A (en) * | 2021-06-02 | 2021-08-10 | 四川大学 | Method and system for separating SiF4 and HF mixed gas |
-
1969
- 1969-02-15 GB GB832269A patent/GB1262571A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233422A (en) * | 2021-06-02 | 2021-08-10 | 四川大学 | Method and system for separating SiF4 and HF mixed gas |
| CN113233422B (en) * | 2021-06-02 | 2023-03-31 | 四川大学 | Method and system for separating SiF4 and HF mixed gas |
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