Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Solvent extraction
Patent
1980-05-02
1981-07-07
Hearn, Brian E.
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
Solvent extraction
208 22, 4234474, 4234476, 423448, 264 292, C10C 316
Patent
active
042773253
ABSTRACT:
The present invention contemplates a process for treating an isotropic carbonaceous graphitizable pitch with an organic fluxing liquid to provide a fluid pitch which has suspended therein substantially all of the quinoline insoluble material in the pitch and which solid material is readily separable by filtering, centrifugation and the like. Thereafter, the fluid pitch is treated in at least two steps with an antisolvent compound, the sum total of which is sufficient to precipitate at least a substantial portion of the pitch, the amount of antisolvent employed in each step increasing from the first step to the last step. In a particularly preferred embodiment of the present invention, the fluid pitch is treated in two steps with an antisolvent compound with from 5% to 15% of the antisolvent compound being used in the first step and from 85% to 95% of the antisolvent compound being used in the second step.
REFERENCES:
patent: 3087887 (1963-04-01), Corbett
patent: 3595946 (1971-07-01), Joo
patent: 3919376 (1975-11-01), Schulz
patent: 3919387 (1975-11-01), Singer
patent: 4005183 (1977-01-01), Singer
patent: 4055583 (1977-10-01), Kolling
patent: 4116815 (1978-09-01), Sunago
patent: 4127472 (1978-11-01), Migitaka
patent: 4184942 (1980-01-01), Angier
patent: 4208267 (1980-06-01), Diefendorf
Dvorak Joseph J.
Exxon Research & Engineering Co.
Hearn Brian E.
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