Microstructure of hydrogenated coal-tar pitches
- Publisher
- Elsevier Science
- Year
- 1995
- Weight
- 180 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0140-6701
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Your corrcspondcnt,s, JIcssrs. !I'riislcr : i d Pittn~nn, in t,licir let.tcr publislictl in CIIEMISIXY ASI) ISI)UPTI~T, d1:irch 10, 1933, rcfcr t,o tlic work ciirrictl out l)y the South JIetropolitnii Gns C'oinpiiny in iissociiition with the lnte Ah. 7-1. I'ickiirtl in connesion with tlic! viscosit,
Thermogravimetric analysis techniques have been adapted to study the thermal decomposition of six coal tar pitches. Two material constants are introduced to describe the thermal stability and/or reactivity of coal tar pitches. These constants can be correlated with the softening point of the pitches
Coals of increasing rank contain a mixture of solid fragments and particles which look liquid. The first ones are a fractions insoluble in boiling anthracene-oil, the others are /I fractions (soluble in anthracene-oil but insoluble in toluene). The content of fi fraction passes by a maximum as softe