Process for producing spherical activated carbon
US7781370B2 · kind B2 · utility
9Cited by
10References
6Claims
0Family size
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Key dates
| Filing date | Sep 24, 2004 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Apr 20, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B32/382
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A spherical activated carbon is produced from a starting pitch obtainable from a heavy hydrocarbon oil, such as petroleum tar, coal tar or ethylene, through a moderate process. The starting pitch has a softening point of at least 150° C., a toluene-insoluble content of at least 40% and a property of retaining optical isotropy even after being heated at 430° C. for 1 hour. The starting pitch is converted into a porous spherical pitch, which is then infusibilized, carbonized and activated to provide a spherical activated carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.