Method of producing active form coke

Details Method of producing active form coke Method of producing active form coke

1986-01-09

1988-06-21

Richman, Barry S.

Distillation: processes, thermolytic

And shaping to desired form or configuration

Prior to charging to carbonizing zone

34172, 201 17, 201 34, 201 38, 202 99, 414199, 422311, C10B 4902, C10B 5308

Patent

active

047523590

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION

This application is a national phase application of PCT/EP 85/00113 filed 16 Mar. 1985 and based, in turn, upon a German national application No. P 34 10 893.9 filed 24 Mar. 1984 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a process and an apparatus for the manufacture of activated coke in the form of a granulate based on pretreated black coal in which premolded granulates are passed through different treatment zones of a shaft and in the zones are pyrolyzed by means of laterally introduced and withdrawn gases or vapors, heated, activated with steam or CO.sub.2 gas or a mixture of steam or CO.sub.2 gas and post-treated and cooled.


BACKGROUND OF THE INVENTION

It is known to manufacture activated form coke from pretreated black coal material in the form of a granulate or a particulate product, the black coal being powdered and made into a paste with a binder and transformed into granulates which are subsequently pyrolyzed and activated, thereby yielding a corresponding particulate or granulated product.
When pretreating the black coal it is possible in addition to precede the powdering by a de-ashing or extraction or oxidation step.
Known binders for converting the powdered black coal into a paste include, black coal tar and wood tar, inorganic gels such as silica gel and iron or aluminum hydroxide, optionally in combination with neutralizing substances such as caustic soda or lime.
It is also known for the manufacture of activated coke to convey the pretreated products intended for that purpose through a shaft which comprises the aforementioned various treatment zones, in which the pyrolysis, heating and activating takes place by laterally introduced and discharged gases or vapors.
In the known process, the material to be treated and which is conveyed through the shaft is rerouted repeatedly in opposite directions in the form of a column of material for the attainment of increased reaction areas and an effective mixing of the reagents, the gases or vapours passing therethrough in a direction transversely to the columns.
In another embodiment the material to be treated is passed through sleeve-shaped internal structures overlapping each other and centrally passing through the shaft from the top downwards and the material column is subjected to a flow therethrough of the treatment gases which are introduced sideways.
The known processes for attaining the required thermal and material exchange require relatively long residence periods the individual zones, in particularly if the flow through the column of material proceeds vertically whereby the energy consumption for effecting the flow and for transferring the heat is increased.
Moreover, an uneven treatment of the material particles contained in the material column results from the pronounced flow profile.
Finally, substantial abrasion losses take place even during the manufacture of the activated coke, because the material particles in the lower region of the material column are subjected to the static pressure of the material load and accordingly high frictional forces in relation to adjoining material particles or the internal structures in the shaft are unavoidable.


SUMMARY OF THE INVENTION

In accordance with the present invention granulates of uniform dimensions having longitudinal and transverse dimensions or a diameter of 6 to 25 mm are molded and are provided in plane shallow beds adapted to the shaft cross section and of uniform bed thickness across the cross section.
Each bed is supported in the shaft by grids at different levels one above the other, leaving free interspaces, and after predetermined residence periods in the individual stages are conveyed through the shaft from the top to the bottom, starting with the lowermost bed, through the discharge means thereof, the beds during the periods of resistance on the grids in the treatment zones being subjected to a flow therethrough of the gases or vapours.
The gases or vapors are introduced into the free inter

REFERENCES:
patent: 1326909 (1920-01-01), Brons
patent: 1834497 (1931-12-01), Oxer
patent: 3149976 (1964-09-01), Smith
patent: 3663421 (1972-05-01), Parr

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