Process for isolating mesophase pitch
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United States of America Patent
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Jul 16, 1991
Grant Date -
N/A
app pub date -
Dec 22, 1988
filing date -
Dec 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Isotropic pitch containing mesogens is combined with a solvent and subjected to dense phase or supercritical conditions and the mesogens are phase separated. In one aspect the isotropic pitch containing mesogens is fluxed with a solvent to solubilize the mesogens, the flux mixture is filtered to remove nonsolubles and the mesogens are phase separated by use of the same solvent under dense phase or supercritical conditions of temperature and pressure. The phase separation conditions are such that the mesogens are recovered as mesophase.
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