Novel method for extraction of salts from coal tar and pitches

Details Novel method for extraction of salts from coal tar and pitches Novel method for extraction of salts from coal tar and pitches

1989-03-30

1989-10-03

Pal, Asok

Mineral oils: processes and products

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

208 45, 208433, C10C 302, C10C 308

Patent

active

048714437

ABSTRACT:
A method of removing salts from coal tar and coal pitches comprising washing coal tar or coal pitch in a pressure container with water and a carbon dioxide containing gas at a temperature and pressure near the critical point of the gas in the optional presence of at least one member of the group consisting of a solvent and an entraining agent, removing the liquid or dissolved tar or pitch to obtain tar or pitch with a low salt content and removing the aqueous phase whereby all the resins remain in the tar or pitch.

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