Process for isolating mesophase pitch

Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Solvent extraction

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208 39, 208 44, 208 22, C10G 2700

Patent

active

054893747

ABSTRACT:
The present invention provides a process for obtaining a very clean mesophase pitch from isotropic pitch. This invention utilizes a solvent fractionation process which does not involve the process steps, yield loss and waste generation associated with fluxing and filtering the isotropic pitch. Additionally, this invention provides a liquid/liquid extraction process that avoids the solids handling and the high temperatures and pressures of supercritical fluid extraction. Finally, this invention controls the hardness of the mesophase product.

REFERENCES:
patent: 5032250 (1991-07-01), Romine
patent: 5181011 (1993-01-01), Tsuchitani
patent: 5259947 (1993-11-01), Kalback

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