Properties of coal tar pitch-based mesophase separated by high-temperature centrifugation
✍ Scribed by Cheol Joong Kim; Seung Kon Ryu; Bo Sung Rhee
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 671 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Mesophase pitches which have different mesophase contents were prepared from a coal tar pitch and separated into mesophase and isotropic phase by high-temperature centrifugation. Properties of mesophase during its nucleation, growth, and coalescence stages were investigated by measuring the solubility, density, C/H atomic ratio, and thermogravimetric analysis. Mesophase pitch is easily separated into mesophase and isotropic phase by high-temperature centrifugation. However, when the mesophase content in pitch is above 82 vol%, the centrifugal separation becomes difficult because of a very small density difference between &he mesophase and isotropic phase. The mesophase content in pitch was increased by centrifugal acceleration at constant temperature. The C/H atomic ratio of the mesophase separated under higher centrifugal acceleration was also increased. QI was the main component of smaller mesophase spheres. and p-resin of the isotropic matrix contributed to the growth of spheres. The density and C/H atomic ratio of mesophase were nearly constant at 1.385 g/cm3 and 2.00, respectively, during heat treatment.