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US3717494A
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Process for the production of color black by the furnace process
Assignee: DEUTSCHE GOLD U SILBER SCHEIDEANSTALT DT
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Filing: 1970-04-28
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Granted: 1973-02-20
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Expires: 1990-04-28
Abstract
Abstract Color blacks of low pH are prepared from furnace blacks by treating the black before separation from the gas phase but after cooling at a temperature between 600* and 150*C., preferably between 500* and 250*C, with an aqueous solution of hydrogen peroxide. Preferably potassium is present in the feedstock in an amount sufficient that the finished carbon black has at least 150 ppm of potassium.
Inventors
- 👤 G Jager
- 👤 G Kuhner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:47
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C09C1/50; C01; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
In a process for the production of carbon black in a gas phase in the form of color black by the furnace process and subsequently separating carbon black from the gas phase, the improvement consisting essentially of cooling the carbon black in the furnace to a temperature between 600* and 150*C and thereafter while still in the furnace at 600* to 150*C treating the carbon black with an aqueous solution of hydrogen peroxide before separation from the gas phase.
Claim 2
Dependent Claim
79 words
In a process for the production of carbon black in a gas phase in the form of color black by the furnace process and subsequently separating carbon black from the gas phase, the improvement consisting essentially of cooling the carbon black in the furnace to a temperature between 600* and 150*C and thereafter while still in the furnace at 600* to 150*C treating the carbon black with an aqueous solution of hydrogen peroxide before separation from the gas phase.
Claim 3
Dependent Claim
35 words
A process according to claim 1 wherein the carbon black containing gas is cooled to between 500* and 250* C. by the addition of quench water prior to the treatment with the aqueous hydrogen peroxide.
Claim 4
Dependent Claim
24 words
A process according to claim 1, wherein the hydrogen peroxide treatment occurs after cooling the carbon black containing gas to between 500* and 250*C.
Claim 5
Dependent Claim
23 words
A process according to claim 3 wherein there is employed an aqueous solution having a hydrogen peroxide concentration of about 35 weight %.
Claim 6
Dependent Claim
33 words
A process according to claim 1 wherein there is added to the carbon black forming raw material sufficient potassium containing material that the finished carbon black contains at least 150 ppm. of potassium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |