Pitch from coal tar pitch, method of its production, as well as application of such pitch material

US5128021A · kind A · utility

Assignees

• Bergwerksverband GmbH · DE
• Didier Engineering GmbH · DE

Inventors

• Ingo Romey · Hünxe, DE
• Rudolf Geier · Essen, DE
• Rolf Helmut Joest · Duisburg, DE
• Wilhelm Wullscheidt · Bottrop, DE

Key dates

• Filing date: Aug 3, 1989
• Grant date: Jul 7, 1992
• Expiry date: Aug 3, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10C1/19
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A novel pitch material made from coal tar pitch has: PA0 a) mesophase content of .ltoreq.2%, PA0 b) content of toluene-insolubles (.beta.-resin) between 58 and 75%, PA0 c) content of quinoline-insolubles of <2%, PA0 d) softening point in the 200.degree. to 300.degree. C. range, according to the Kramer-Sarnow (KS) measurement, PA0 e) content of volatile matter .ltoreq.20% and PA0 f) ash content of .ltoreq.0.06%. The pitch material of high coke yield (80 to beyond 90%) is suitable for the manufacture of molded carbonaceous shapes of high quality and of pitch coke. A further application would be as impregnation agent or bind. The method of making new pitch uses hot filtration in the presence of a filtration and followed by thin-film evaporation.