OXIDIZING TREATMENT OF CARBON BLACK

PROBLEM TO BE SOLVED: To enable oxidizing treatment of a powder carbon black extremely efficiently, in large quantities and continuously by subjecting the powder carbon black prepared by a furnace-type manufacturing oven to gas-phase oxidization treatment at a specific stage. SOLUTION: A powder furn...

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Bibliographic Details
Main Authors YOSHIMURA SHUSHICHI, OSAKI YASUNARI
Format Patent
LanguageEnglish
Published 11.01.2000
Edition7
Subjects
ADHESIVES
CHEMISTRY
DYES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
PREPARATION OF CARBON BLACK
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Summary:PROBLEM TO BE SOLVED: To enable oxidizing treatment of a powder carbon black extremely efficiently, in large quantities and continuously by subjecting the powder carbon black prepared by a furnace-type manufacturing oven to gas-phase oxidization treatment at a specific stage. SOLUTION: A powder furnace carbon black at a stage at which it has just generated by thermal cracking after charging a raw material oil in a furnace-type manufacturing furnace and its bulk density has not reached 0.15 g/cc is subjected to gas-phase oxidation treatment. This stage is a stage at which the carbon black has not received handling at the outlet of a collection bag filter or it may pass through another bag filter if the bulk density remains below 0.15 g/cc. The oxidation reaction is conducted in the gas phase in a reaction tube by using air as a diluent, with an oxidizing agent concentration being 1-30 g/Nm3 and a flow rate being 5-40 m/s. The oxidizing agent is added in an amount to give an oxidation degree of 1-20 wt.%. Gas-phase oxidizing agents include ozone, nitrogen dioxide and the like, but not specifically limited to.
Bibliography:Application Number: JP19980190965