US1491944A - Process of producing chromic-acid solutions - Google Patents
Process of producing chromic-acid solutions Download PDFInfo
- Publication number
- US1491944A US1491944A US531282A US53128222A US1491944A US 1491944 A US1491944 A US 1491944A US 531282 A US531282 A US 531282A US 53128222 A US53128222 A US 53128222A US 1491944 A US1491944 A US 1491944A
- Authority
- US
- United States
- Prior art keywords
- chromic
- acid solutions
- lead
- anode
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title description 12
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 title description 11
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 title description 6
- 239000000243 solution Substances 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 7
- 229910001245 Sb alloy Inorganic materials 0.000 description 4
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 3
- 239000002140 antimony alloy Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229940055042 chromic sulfate Drugs 0.000 description 1
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 1
- 229910000356 chromium(III) sulfate Inorganic materials 0.000 description 1
- 235000015217 chromium(III) sulphate Nutrition 0.000 description 1
- 239000011696 chromium(III) sulphate Substances 0.000 description 1
- 229910052571 earthenware Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
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
Definitions
- a preferred form of apparatus for use in connection with the above recess comprises a containing vessel of lead or lead-antimony alloy serving as the anode; a porous cup or vessel functioning as a diaphragm; and a cathode, which may be of sheet lead, within the latter.
- I provide an electrolytic cell having a porous diaphragm of acid resisting material such as filtros, porous earthenware 'or the like.
- electrodes may be of lead, or a lead-antimony alloy containing about 35-70% of antimony as described above, cast metal being preferably used in either case.
- the solution surrounding thecathode may consist of dilute sulfuric acid, or alternatively of any soluble sulfate.
- the anode compartment contains initiall a suspension or magma ol chromic hy roxid in water, slightly acidulated with sulfuric acid, or containing a small addition of a soluble sulf ate such as chromic sulfate, sodium sulfate, etc. Upon passage of the electric current the chromic hydroxid is progressively, and eventually completely, oxidized to chromic acid.
- the proportion of chromic hydroxid to water in the original charge is such that the concentration of (110;, in the final solution will approximate but not excecd 1077.
- Anode current densities of the order of 18 amperes per square foot are preferred, with cathode current densities of the order of 100-200 amperes; 8595 C. is a favorable working temperature.
- the process is most conveniently operated intermittently; but it is within my invention to provide for continuous or semi-continuous o-poration, the chromic acid solution being withdrawn from. the anode compartment, and the equivalent quantities of chromic hydroxid and water supplied thereto.
- I claim i Process of producing chromic acid solutions which consists in subjecting a magma or suspension comprising chromic hydroxid and water to anodicoxidation.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Description
Patented pr. 29, 1924.
PROCESS OF PRODUCING CHRONIC-ACID SOLUTIONS.
Ho Drawing.
To all whom z'tmay concern:
Be it known that ARTHUR W. BURWI'JLL, a citizen of the United States, residing at Poughkeepsie, in the county of Dutchess and State of New York, have invented certain new and useful Improvements in Processes of Producing Chromic-Acid Solutions, of which the following is a specification.
Inan application filed concurrently herewith, Ser. No. 531,281, I have described and claimed a process of oxidizing chromic salt solutions by causing the same to flow successively through the cathode and anode compartments of an electrolytic cell having a porous diaphragm, employing certain precautions having the effect of insuring a high degree of efficiency in the utilization of the current and a continued normal operation of the process. Thus, in said process I preferahly use an anode consisting of cast metal, which may be lead; or a lead-antimony alloy containing a comparatively small proportion -say up to 7 per centof antimony; or a lead-antimon y alloy presenting an vactive face of lead. In said process also I use sufficient excess of chromic salt in the flowing electrolyte to avoid substantial evolution of oxygen at the anode. A preferred form of apparatus for use in connection with the above recess comprises a containing vessel of lead or lead-antimony alloy serving as the anode; a porous cup or vessel functioning as a diaphragm; and a cathode, which may be of sheet lead, within the latter.
According to the present invention I am able toprepare directly from chromic hydroxid, a solution of chromic acid substantially free from sulfuric acid. The apparatus employed may be the same as that used for the oxidation of chromic salt solutions;
as mentioned above; but in the present process it is unnecessary to provide fora continuous flow of solutions.
In practicing the present invention I provide an electrolytic cell having a porous diaphragm of acid resisting material such as filtros, porous earthenware 'or the like.
Both
Application filed January 23, 1922. Serial No. 531,282.
electrodes may be of lead, or a lead-antimony alloy containing about 35-70% of antimony as described above, cast metal being preferably used in either case. The solution surrounding thecathode may consist of dilute sulfuric acid, or alternatively of any soluble sulfate. The anode compartment contains initiall a suspension or magma ol chromic hy roxid in water, slightly acidulated with sulfuric acid, or containing a small addition of a soluble sulf ate such as chromic sulfate, sodium sulfate, etc. Upon passage of the electric current the chromic hydroxid is progressively, and eventually completely, oxidized to chromic acid. Preferably the proportion of chromic hydroxid to water in the original charge is such that the concentration of (110;, in the final solution will approximate but not excecd 1077. Anode current densities of the order of 18 amperes per square foot are preferred, with cathode current densities of the order of 100-200 amperes; 8595 C. is a favorable working temperature. The process is most conveniently operated intermittently; but it is within my invention to provide for continuous or semi-continuous o-poration, the chromic acid solution being withdrawn from. the anode compartment, and the equivalent quantities of chromic hydroxid and water supplied thereto.
I claim i 1. Process of producing chromic acid solutions which consists in subjecting a magma or suspension comprising chromic hydroxid and water to anodicoxidation.
2. Process according to claim 1 in which thedanodes present active surfaces of cast lea v 3. Process according to claim 1 in which the anode consists of a cast alloy of lead and antimony, said alloy containing a relatively small proportion of antimony.
In testimony whereof, I aflix my signature,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US531282A US1491944A (en) | 1922-01-23 | 1922-01-23 | Process of producing chromic-acid solutions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US531282A US1491944A (en) | 1922-01-23 | 1922-01-23 | Process of producing chromic-acid solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1491944A true US1491944A (en) | 1924-04-29 |
Family
ID=24117003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US531282A Expired - Lifetime US1491944A (en) | 1922-01-23 | 1922-01-23 | Process of producing chromic-acid solutions |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1491944A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3755112A (en) * | 1972-02-01 | 1973-08-28 | Capital Wire And Cable Co | Electrowinning of copper |
-
1922
- 1922-01-23 US US531282A patent/US1491944A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3755112A (en) * | 1972-02-01 | 1973-08-28 | Capital Wire And Cable Co | Electrowinning of copper |
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