Process for removing extractable substances from carbon black

US4435378A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Reinhold Reck · Maintal, DE
• Gerhard Kuhner · Hanau, DE
• Manfred Voll · Hanau, DE
• Peter Kleinschmit · Hanau, DE

Key dates

• Filing date: May 7, 1982
• Grant date: Mar 6, 1984
• Expiry date: May 7, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/22
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for removing extractables from carbon blacks in a fluidized bed, wherein low extractable carbon blacks are treated under relatively mild temperature conditions (320.degree. C.) with an oxygen containing gas and high extractable carbon blacks are treated first at 100.degree.-320.degree. C. with steam and then at 200.degree.-500.degree. C. with an oxygen containing gas. A definition of classification in the "low extractable" and "high extractable" categories is given.