Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Solvent extraction
Patent
1994-11-07
1996-02-06
Myers, Helane
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
Solvent extraction
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
Carel Mark W.
Nanni Edward J.
Romine H. Ernest
Southard W. Mark
Conoco Inc.
Hall William D.
Myers Helane
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