Novel method for extraction of salts from coal tar and pitches

US4871443A · kind A · utility

Assignee

• Rutgerswerke Aktiengesellschaft · DE

Inventors

• Herbert Beneke · Castrop-Rauxel, DE
• Arnold Alscher · Essen, DE
• Rudolf Oberkobusch · Duisburg, DE
• Siegfried Peter · Erlangen, DE
• Wolfgang Jaumann · Nuremberg, DE

Key dates

• Filing date: Mar 30, 1989
• Grant date: Oct 3, 1989
• Expiry date: Mar 30, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10C1/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.