Pitch from coal tar pitch, method of its production, as well as application of such pitch material
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Aug 3, 1989
filing date -
Jan 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel pitch material made from coal tar pitch has: a) mesophase content of .ltoreq.2%, b) content of toluene-insolubles (.beta.-resin) between 58 and 75%, c) content of quinoline-insolubles of <2%, d) softening point in the 200.degree. to 300.degree. C. range, according to the Kramer-Sarnow (KS) measurement, e) content of volatile matter .ltoreq.20% and 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.
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