Process for activation of carbon by electrical resistance heatin

Details Process for activation of carbon by electrical resistance heatin Process for activation of carbon by electrical resistance heatin

1991-01-04

1992-02-18

Konopka, Paul E.

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

Irradiation by, or application of, electrical, magnetic or...

201 19, 201 27, 373115, 502 55, 502432, B01J 3734, C01B 3110, F27D 300, C10B 104

Patent

active

050894579

ABSTRACT:
In an apparatus and process for the activation of carbon from carbon feedstocks by electrical resistance heating in the presence of steam, which comprises preheating particles of the carbon feedstock in a preheater, having the particles descend by gravity into and through a vertical reactor connected to the preheater, introducing steam at the bottom of the reactor so that it moves upward against the downward flow of the particles, passing an electric current through the particles in the reactor, and discharging the activated carbon from the bottom of the reactor, the improvements that comprise feeding the carbon feedstock through the side of the preheater, controlling the electric input, having the reactor project into the preheater, using a knife-gate valve and a discharge-limiting device to control the discharge of the activated carbon, using a carbon feedstock that contains up to about 25% of organic volatiles, maintaining the preheating temperature within a range from about 550.degree. C. to about 750.degree. C., having the inner radius of the reactor about 75 times the average size of the particles, and having the electric current pass through a portion of the particles in the preheater.

REFERENCES:
patent: 1597208 (1926-08-01), Naugle
patent: 1601222 (1926-09-01), Naugle
patent: 1634477 (1927-07-01), Wickenden et al.
patent: 1701272 (1929-02-01), Naugle
patent: 2003278 (1935-05-01), Olson
patent: 2270245 (1942-01-01), Barker
patent: 4139489 (1979-02-01), Mizuno et al.
patent: 4261857 (1981-04-01), Nakao

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