Apparatus and method for recovering carbon black from...

Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon

Reexamination Certificate

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C423S461000, C423S449700

Reexamination Certificate

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07347982

ABSTRACT:
A system (10), process and apparatus are disclosed for purifying carbon black (15) containing sulfur and metal oxide impurities by digesting (20) the impure carbon black in an acid to extract the metal oxide (25). Sulfur (45) is then removed from the acid treated carbon black (30) by solvent extraction (35) with an organic aromatic solvent which is then recovered (50). The purified carbon black (40) is then suitable for use as a toner (60) by toner black processing (55).

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patent: 4264568 (1981-04-01), Haas et al.
patent: 5560892 (1996-10-01), Bennett et al.
patent: 5658704 (1997-08-01), Patel et al.
patent: 58222157 (1983-12-01), None

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