Process for producing crude coal-tar pitches having improved...

Details Process for producing crude coal-tar pitches having improved... Process for producing crude coal-tar pitches having improved...

C - Chemistry, Metallurgy

10

C

196/39

C10C 3/08 (2006.01) B01D 11/02 (2006.01) C10C 1/18 (2006.01)

Patent

CA 1267861

ABSTRACT OF THE DISCLOSURE Depending on requirements and intended use crude pitches are mixed from coal-tar-pitch fractions obtained by extraction with an above-critical gas and an entraining agent from the above-critical solution by gradually changing the pressure and the temperature. Ash-free as well as QI-free and TI-free fractions are obtained. Primarily low-boiling aliphatic and olefinic hydrocarbons are used as extracting agents and aromatic hydrocarbons as entraining agents. The crude pitches are used, for example, for producing carbon black and for producing carbon mouldings.

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