Apparatus and method for recovering carbon black from...

Details Apparatus and method for recovering carbon black from... Apparatus and method for recovering carbon black from...

2008-03-25

2008-03-25

Hendrickson, Stuart (Department: 1793)

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

C423S461000, C423S449700

Reexamination Certificate

active

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: 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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