Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent – Free carbon containing
Patent
1982-09-24
1985-01-08
Konopka, P. E.
Catalyst, solid sorbent, or support therefor: product or process
Solid sorbent
Free carbon containing
55 73, 264 293, 264 297, 423244, 502413, 502433, 502435, 502436, C01B 3110, C01B 3108, C01B 3102, B01J 2020
Patent
active
044927711
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
This invention relates to a process for producing carbon material for de-sulfurization with coal as the raw material. More particularly, it is concerned with a process for producing granular activated carbon excellent in adsorptibility and mechanical strength.
BACKGROUND OF TECHNOLOGY
In recent years, granular activated carbon produced from coal as the raw material has become used as the carbon material for removing sulfur from discharge gas from thermoelectric power plants, chemical plants, metal refineries, and others.
And, the de-sulfurizing operations of discharge gas with the activated carbon is classified into the so-called dry method and wet method. In either method, since adsorption and reproduction are repeatedly done over a long period of time, the activated carbon is required to have, along with its adsorptibility, various mechanical strength such as impact resistance strength, wear-resistance strength, and so forth.
In case, however, coal is used as the raw material, it is a general trend that, when the absorptibility is increased, the mechanical strength decreases, and, on the contrary, when the mechanical strength is to be increased, the adsorptibility is lost. Therefore, emergence of the carbon material for de-sulfurization excellent in its adsorptibility and mechanical strength has heretofore been desired.
Furthermore, the carbonization treatment of shaped raw material coal is done by heating the raw material to the ultimate temperature of approximately 600.degree. to 1,000.degree. C. using a heating furnace such as rotary kiln, fluidized bed, mobile bed, etc.. However, this treatment has shortcomings such that, depending on the manner of handling the raw material for the carbonization treatment, the shaped coal is subjected to crush and wear to cause poor rate of yield, and, further, the mechanical strength of the resulting carbon material is lowered because of such crush and wear. Such shortcomings are particularly remarkable when the rotary kiln is used as the heating furnace.
SUMMARY OF THE INVENTION
The object of the present invention is to provide the carbon material having large adsorptibility to oxides of sulfur, from coal as the raw material, without impairing the mechanical strength. The other object of the present invention is to provide a method capable of producing such carbon material with good rate of recovery.
And, such objects can be readily achieved in accordance with the present invention to be described hereinbelow.
In the following, the present invention will be explained in detail.
For non-coking coal to be used for the purpose of the present invention, there may be enumerated one or more than two kinds of lignite, brown coal, sub-bituminous coal, and anthracite having no coking property. For coking coal, there may be used one or more than two kinds of sub-bituminous coal and bituminous coal having slight coking property, weak coking property, or strong coking property. In particular, favorable results can be obtained when brown coal is used as the non-coking coal, and strongly coking bituminous coal as the coking coal. A blending ratio of the coking coal in the blended coal is at least a few percent by weight and above, usually 5% by weight or so and above, e.g., 15 to 60% by weight. These raw material coals are crushed either after the blending or before the blending. The degree of crushing should preferably be such that the entire raw material pass through a 60-mesh sieve, of which 40 to 70% by weight, or preferably 50 to 60% by weight be a 200-mesh under-sieve.
The mean reflecting power (R.sub.o) of the blended coal is a value calculated from a value of each simple coal measured in accordance with Japanese Industrial Standards (JIS) M8816, depending on the blending ratio. In the present invention, it is desirable that the blending ratio of the non-coking coal and the coking coal be so adjusted as to bring this value to a range of from 0.3 to 1.0, or preferably from 0.4 to 1.0. When the mean reflecting power (R.sub.o) is 1.0 and above, the
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Hasegawa Takashi
Tsuchihashi Koji
Yamashita Hiroshi
Konopka P. E.
Mitsubishi Chemical Industries Limited
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