GB961200A - Production of chromic acid - Google Patents
Production of chromic acidInfo
- Publication number
- GB961200A GB961200A GB4578062A GB4578062A GB961200A GB 961200 A GB961200 A GB 961200A GB 4578062 A GB4578062 A GB 4578062A GB 4578062 A GB4578062 A GB 4578062A GB 961200 A GB961200 A GB 961200A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cro3
- anolyte
- alkali metal
- solution
- chromic acid
- 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
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/02—Oxides or hydrates thereof
- C01G37/033—Chromium trioxide; Chromic acid
-
- 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)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
<PICT:0961200/C6-C7/1> Chromic acid is made electrolytically, using alkali metal chromate solution as anolyte in a two-compartment cell the permionic barrier of which is permeable to alkali metal ions but impermeable to CrO3 ion, continuing electrolysis until the alkali metal oxide content is less than 11% by weight, and preferably below 5%, then withdrawing the anolyte and isolating CrO3 therefrom. The catholyte may be NaOH, Na2CO3, or NaHCO3 solution. Preferably the Na2O to CrO3 ratio in the anolyte is maintained at 1:3 to 1:15, and at 60-80 DEG C. The permeonic diaphragm may be asbestos impregnated with a polymer, e.g. maleic anhydride polymerized with divinyl benzene or styrene, and is mounted in contact with the cathode and slightly spaced from the anode consisting of lead coated steel sheet. A range of polymers are described as impregnating compounds. The anolyte is continuously withdrawn and the CrO3 content concentrated to about 67% solution in an evaporating tower fed at its base with hot air. The concentrate is then cooled and the CrO3 crystalized out to form a slurry which is then filtered or centrifuged. Specifications 961,198 and 961,199 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15790761A | 1961-12-08 | 1961-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB961200A true GB961200A (en) | 1964-06-17 |
Family
ID=22565824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4578062A Expired GB961200A (en) | 1961-12-08 | 1962-12-04 | Production of chromic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB961200A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3207776A1 (en) * | 1981-03-09 | 1982-09-16 | Daniel J. 19803 Wilmington Del. Vaughan | METHOD FOR THE ELECTRODIALYTIC TREATMENT OF GALVANIZING SOLUTIONS |
| US5096547A (en) * | 1990-06-23 | 1992-03-17 | Bayer Aktiengesellschaft | Preparation of chromic acid using bipolar membranes |
-
1962
- 1962-12-04 GB GB4578062A patent/GB961200A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3207776A1 (en) * | 1981-03-09 | 1982-09-16 | Daniel J. 19803 Wilmington Del. Vaughan | METHOD FOR THE ELECTRODIALYTIC TREATMENT OF GALVANIZING SOLUTIONS |
| US4439293A (en) * | 1981-03-09 | 1984-03-27 | Vaughan Daniel J | Electrodialytic purification process |
| US5096547A (en) * | 1990-06-23 | 1992-03-17 | Bayer Aktiengesellschaft | Preparation of chromic acid using bipolar membranes |
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