US1429912A - Process of making green chrome oxide - Google Patents
Process of making green chrome oxide Download PDFInfo
- Publication number
- US1429912A US1429912A US513135A US51313521A US1429912A US 1429912 A US1429912 A US 1429912A US 513135 A US513135 A US 513135A US 51313521 A US51313521 A US 51313521A US 1429912 A US1429912 A US 1429912A
- Authority
- US
- United States
- Prior art keywords
- chrome oxide
- making green
- bichromate
- sulphate
- chromate
- 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
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-
- 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
Definitions
- y invention relates to a process of producing green chromium oxide.
- An important object of the invention is to provide a process of the abovementioned character, which is inexpensive and easy to practice.
- the process consists generally in mixing a chromate or bichromate, such as potassium chromate or sodium bichromate with ammonium sulphate, and in heating the mixture until all (or substantially all) the chromium in the chromate or bichromate is converted into chromium oxide.
- a chromate or bichromate such as potassium chromate or sodium bichromate with ammonium sulphate
- chromate or bichromate the metallic part of which forms a sulphate. which is soluble in water.
- the sodium bichromate and ammonium a0 sulphate are either mixed dry, or to obtain a more intimate mixture, are mixed with a relatively small amount of water. The mixture is then heated to a temperature which need not exceed 400 C., and satisfactory results are obtained by heating the same to approximately 400 C. for from 15 Application filed November 5, 1921. Serial No. 513,135.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Patented Sept. 19, 1922.
ALEXANDER I. DUVAL DADRIAN, OF WASHINGTON, PENNSYLVANIA PROCESS OF MAKING GREEN CfiROME OXIDE.
We Drawing.
T all whom it may concern:
Be it known that I, ALEXANDER L. DUVAL DADRIAN, a citizen of the Republic of France, residing at Washington, in the county of Washington and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Making Green Chrome Oxide, of which the followingiis a specification.
y invention relates to a process of producing green chromium oxide.
An important object of the invention is to provide a process of the abovementioned character, which is inexpensive and easy to practice.
The process consists generally in mixing a chromate or bichromate, such as potassium chromate or sodium bichromate with ammonium sulphate, and in heating the mixture until all (or substantially all) the chromium in the chromate or bichromate is converted into chromium oxide.
Any other chromate or bichromate may be used instead of the alkali metal chromate,
or sodium chromate, but it is preferred to use a chromate or bichromate, the metallic part of which forms a sulphate. which is soluble in water.
In the practice of my process, I prefer to use a mixture of sodium bichromate and ammonium sulphate, in the proportions of 100 parts by weight of chemically pure sodium bichromate, and 50 partsby weight of chemically pure ammonium sulphate.
85 These proportions can, however, be varied accordin to the purity of the materials used, an according to the character of the chromium oxide desired to be obtained.
The sodium bichromate and ammonium a0 sulphate are either mixed dry, or to obtain a more intimate mixture, are mixed with a relatively small amount of water. The mixture is then heated to a temperature which need not exceed 400 C., and satisfactory results are obtained by heating the same to approximately 400 C. for from 15 Application filed November 5, 1921. Serial No. 513,135.
-minutes to two hours, depending upon the depth of color desired in the chromium oxide.
As a result of this treatment, there is obtained a mixture of chromium oxide and a sulphate of the metal part of the chromium compound, to wit, in this case sodium sulphate. This sodium sulphate is soluble in water, and is separated out from the chromium oxide by washing and filtering.
It is to be understood that the form of my invention herewith described is to be taken as a preferred example of the same, and that various changes may be resorted to in the order of the steps of the process and that known chemical equivalents may be employed without departing from the spirit of the invention of the scope of the subjoined claims.
Having thus described my invention, I claim:
'1. The process of producing a green chrome oxide, which consists in mixing substantially 100 parts by weight of sodium bichromate with substantially parts by weight of ammonium sulphate, subjecting this mixture to the action of heat of approximately 400 C. for from 15 minutes to two hours, subjecting the product obtained to the action of water to dissolve the soluble sodium sulphate, and separating out the insoluble chromium oxide.
2. The process of producing a green chrome oxide, which consists in mixing substantially 100 parts by weight of an alkali metal chromate with substantially 50 parts by weight of ammonium sulphate, subjecting this mixture to the action of heat of approximately 400 degrees C. for from 15 minutes to 2 hours, subjecting the product thus obtained to the action of water to dissolve the soluble constituents, and separating out the insoluble chromium oxid'e.
In testimony whereof I afix my signature.
ALEXANDER'L. DUVAL oADR-IAN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US513135A US1429912A (en) | 1921-11-05 | 1921-11-05 | Process of making green chrome oxide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US513135A US1429912A (en) | 1921-11-05 | 1921-11-05 | Process of making green chrome oxide |
Publications (1)
Publication Number | Publication Date |
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US1429912A true US1429912A (en) | 1922-09-19 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US513135A Expired - Lifetime US1429912A (en) | 1921-11-05 | 1921-11-05 | Process of making green chrome oxide |
Country Status (1)
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US (1) | US1429912A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2300790A1 (en) * | 1975-02-15 | 1976-09-10 | Bayer Ag | PROCESS FOR PREPARING GREEN OXIDE OF IMPROVED PIGMENT CHROME |
US3981964A (en) * | 1973-12-07 | 1976-09-21 | British Chrome & Chemicals Limited | Sodium sulphate compositions and their production |
US4040860A (en) * | 1975-07-09 | 1977-08-09 | Bayer Aktiengesellschaft | Chromium oxide pigment from sodium chromate dihydrate plus ammonium salt |
FR2360516A1 (en) * | 1976-08-04 | 1978-03-03 | Bayer Ag | PROCESS FOR THE PREPARATION OF A CHROME-III OXIDE WITH LOW SULFUR CONTENT FROM A METAL ALKALINE AND AMMONIUM SULPHATE CHROMATE |
US4291000A (en) * | 1979-02-17 | 1981-09-22 | British Chrome & Chemicals Limited | Process for the production of chromium trioxide |
US5032377A (en) * | 1988-06-10 | 1991-07-16 | Bayer Aktiengesellschaft | Chromium oxide green, a process for its production and its use |
-
1921
- 1921-11-05 US US513135A patent/US1429912A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3981964A (en) * | 1973-12-07 | 1976-09-21 | British Chrome & Chemicals Limited | Sodium sulphate compositions and their production |
FR2300790A1 (en) * | 1975-02-15 | 1976-09-10 | Bayer Ag | PROCESS FOR PREPARING GREEN OXIDE OF IMPROVED PIGMENT CHROME |
US4067747A (en) * | 1975-02-15 | 1978-01-10 | Bayer Aktiengesellschaft | Production of improved chromium oxide green pigment |
US4040860A (en) * | 1975-07-09 | 1977-08-09 | Bayer Aktiengesellschaft | Chromium oxide pigment from sodium chromate dihydrate plus ammonium salt |
FR2360516A1 (en) * | 1976-08-04 | 1978-03-03 | Bayer Ag | PROCESS FOR THE PREPARATION OF A CHROME-III OXIDE WITH LOW SULFUR CONTENT FROM A METAL ALKALINE AND AMMONIUM SULPHATE CHROMATE |
US4235862A (en) * | 1976-08-04 | 1980-11-25 | Bayer Aktiengesellschaft | Production of low sulphur chromium (III) oxide |
US4291000A (en) * | 1979-02-17 | 1981-09-22 | British Chrome & Chemicals Limited | Process for the production of chromium trioxide |
US5032377A (en) * | 1988-06-10 | 1991-07-16 | Bayer Aktiengesellschaft | Chromium oxide green, a process for its production and its use |
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