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8588714 
Journal Article 
Solvent fractionation of petroleum pitch for mesophase formation 
Weinberg, VA; White, JL; Yen, TF 
1983 
1 
Fuel
ISSN: 0016-2361
EISSN: 1873-7153 
ELSEVIER SCI LTD 
OXFORD 
62 
12 
1503-1509 
English 
WOS:A1983RU10800019 
Petroleum pitch (Ashland A240) has been subjected to thermal treatment and solvent fractionation to produce refined pitches to be evaluated as impregnants for C-C composites. The solvent fractions were obtained by sequential Soxhlet extraction with solvents such as hexane, benzene, and pyridine. Thermal treatment to 408 °C produced a mesophase pitch (≈50% mesophase); an appreciable portion of the mesophase was soluble in strong solvents. There were substantial differences in chemical composition and in pyrolysis behaviour of the fractions. As the depth of fraction increased, the pyrolysis yield and bloating increased, and the microstructure of the coke became finer until glassy microconstituents were formed in the deepest fractions. © 1983. 
fractionation; mesophase; petroleum; pitches