Process for isolating mesophase pitch

Details Process for isolating mesophase pitch Process for isolating mesophase pitch

C - Chemistry, Metallurgy

10

C

C10C 3/00 (2006.01) C10C 3/06 (2006.01) C10C 3/08 (2006.01) C10G 53/06 (2006.01)

Patent

CA 2202525

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.

La présente invention expose un procédé permettant d'obtenir un brai de mésophase très épuré à partir d'un brai isotropique. Cet invention fait appel à un processus de fractionnement par solvant n'entraînant pas la perte de produit et la production de déchets associées à la mise en fusion et au filtrage du brai isotropique. De surcroît, cette invention autorise un procédé d'extraction liquide-liquide qui évite une manipulation de matières ainsi que le recours aux températures élevées at aux fortes pressions que suppose une extraction par fluide supercritique. En fin de compte, cette invention permet de maîtriser la dureté du produit de mésophase.

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