Process for producing pitch raw materials

Details Process for producing pitch raw materials Process for producing pitch raw materials

1987-01-07

1989-02-21

Sneed, H. M.

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

Solvent extraction

208433, 208 22, C10C 120, C10C 118

Patent

active

048062286

ABSTRACT:
A process for the production of pitch raw materials having improved properties comprising extracting coal-tar pitch free of solids with a mixture of a supercritical gas extracting agent and an entrainer at elevated temperatures and pressures, passing the extraction mixture to a plurality of separation steps where the supercritical gas and entrainer are removed by lowering the pressure and/or raising the temperature, recycling the mixture of extracting agent and entrainer to the extraction step and recovering the pitch fractions from the separation step, the said pitch fractions being useful for diverse purposes such as soot production, electrode bonding agents, etc.

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