Highly activated carbon from caustic digestion of rice hull ash

Details Highly activated carbon from caustic digestion of rice hull ash Highly activated carbon from caustic digestion of rice hull ash

1998-09-23

2000-09-05

Marcheschi, Michael

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Free carbon containing

502416, 502427, 502180, 423445R, 4234498, C01B 3108, C01B 3112

Patent

active

061142808

ABSTRACT:
Disclosed are highly activated carbon particles derived from caustic digestion of rice hull ash obtained from thermal pyrolysis of rice hulls having an iodine number of at least 650 to 1000. The activated carbon pores are free of silicate residue from the caustic digestion. Also disclosed are methods of removing the silicate residue from the caustic silicate solution during digestion effective to substantially improve the activation of the carbon particles to commercial grade.

REFERENCES:
patent: 4425256 (1984-01-01), Pilipski
patent: 5064805 (1991-11-01), Otowa
patent: 5187141 (1993-02-01), Jha et al.
patent: 5242879 (1993-09-01), Abe et al.
patent: 5726118 (1998-03-01), Ivey et al.
patent: 5858911 (1999-01-01), Wellen et al.
patent: 5883040 (1999-03-01), Armstrong et al.

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