GB1263505A - Process for the production of substantially impurity-free high percent hydrofluoric acid - Google Patents
Process for the production of substantially impurity-free high percent hydrofluoric acidInfo
- Publication number
- GB1263505A GB1263505A GB1142369A GB1142369A GB1263505A GB 1263505 A GB1263505 A GB 1263505A GB 1142369 A GB1142369 A GB 1142369A GB 1142369 A GB1142369 A GB 1142369A GB 1263505 A GB1263505 A GB 1263505A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sif
- solvent
- hydrofluoric acid
- inert
- march
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
1,263,505. Purifying hydrofluoric acid; silicon tetrafluoride. BUSS A.G. 4 March, 1969 [9 March, 1968], No. 11423/69. Heading C1A. High per cent hydrofluoric acid, substantially free from SiF 4 , is obtained from H 2 SiF 6 solutions or HF, SiF 4 and/or H 2 SiF 6 mixtures by contacting the solution or mixture in an absorption column with an organic solvent for HF and, to a lesser extent, H 2 O and SiF 4 , thereafter scavenging the said solvent and its contacts in a separating column by contra-flow of a gas inert to H 2 O, HF or H 2 SiF 6 , to remove at least the majority of the SiF 4 and H 2 O therefrom and then separating HF from the scavenged solvent, the process being carried out above the condensation temperature of any vapour mixture present. Suitable inert gases are nitrogen or carbon dioxide, and the inert gas is preferably also led into the absorption column to improve the selectivity of the solvent for HF as compared to H 2 O and SiF 4 . Suitable solvents are aliphatic polyethers or polyols especially polyglycols. The inert gas may be preheated and the temperature suitably drops from 135‹ to 100‹ C. in contraflow to the liquid phase.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681667537 DE1667537A1 (en) | 1968-03-09 | 1968-03-09 | Process for the production of high percentage hydrogen acids of the halogens that are largely free of impurities |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1263505A true GB1263505A (en) | 1972-02-09 |
Family
ID=5685972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1142369A Expired GB1263505A (en) | 1968-03-09 | 1969-03-04 | Process for the production of substantially impurity-free high percent hydrofluoric acid |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT292633B (en) |
| BE (1) | BE729649A (en) |
| CH (1) | CH527125A (en) |
| DE (1) | DE1667537A1 (en) |
| FR (1) | FR2003576A1 (en) |
| GB (1) | GB1263505A (en) |
| NL (1) | NL6903399A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2921916C2 (en) * | 1979-05-30 | 1982-05-27 | Chemische Werke Hüls AG, 4370 Marl | Process for the production of gaseous hydrogen chloride from dilute aqueous hydrochloric acid |
| DE2836580C3 (en) * | 1978-08-21 | 1981-11-05 | Chemische Werke Hüls AG, 4370 Marl | Process for the separation of hydrogen chloride and hydrogen bromide |
| US4237110A (en) * | 1979-04-30 | 1980-12-02 | The Dow Chemical Company | Process for separating and recovering concentrated hydrochloric acid from the crude product obtained from the acid hydrolysis of cellulose |
-
1968
- 1968-03-09 DE DE19681667537 patent/DE1667537A1/en active Pending
-
1969
- 1969-02-10 AT AT132769A patent/AT292633B/en not_active IP Right Cessation
- 1969-02-28 CH CH301469A patent/CH527125A/en not_active IP Right Cessation
- 1969-03-04 GB GB1142369A patent/GB1263505A/en not_active Expired
- 1969-03-05 NL NL6903399A patent/NL6903399A/xx unknown
- 1969-03-07 FR FR6906487A patent/FR2003576A1/fr not_active Withdrawn
- 1969-03-10 BE BE729649D patent/BE729649A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2003576A1 (en) | 1969-11-07 |
| AT292633B (en) | 1971-09-10 |
| BE729649A (en) | 1969-08-18 |
| CH527125A (en) | 1972-08-31 |
| NL6903399A (en) | 1969-09-11 |
| DE1667537A1 (en) | 1971-06-16 |
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