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US 8,574,527 B2Granted
Process for aftertreating carbon black
AssigneeEvonik Carbon Black GmbH
InventorsFrank Stenger, Klaus Bergemann, Manfred Nagel
Life of this patent
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Abstract
The invention relates to a process for aftertreating carbon black, wherein the carbon black is subjected to a carrier gas flow in a fluidized bed apparatus in the lower region of the apparatus, an additional gas stream is introduced into the fluidized bed apparatus, and the carbon black is aftertreated in the fluidized bed which arises.
Claims19
A process for treating carbon black in a fluidized bed apparatus, comprising:
- a) subjecting said carbon black to a main flow of gas flowing in a direction from an inlet region in the lower part of said fluidized bed apparatus to an outlet region in the upper part of said fluidized bed apparatus, wherein:
- i) a carrier gas is introduced in the lower part of said fluidized bed apparatus;
- and
- ii) an additional gas is also introduced into said fluidized bed apparatus, wherein said additional gas is introduced at an angle of 91° to 180° relative to the direction of the main gas flow of the fluidized bed in a stream counter to the direction of the main gas flow, and wherein it is the introduction of said additional gas that allows a stable fluidized bed to be obtained;
- b) treating said carbon black in said fluidized bed apparatus with a gas aftertreatment agent introduced into the fluidized bed via the carrier gas, the additional gas, via a combination of the two or via an additional feed site.
2 more elements
Dependencies are inferred from the claim text.