Solvent extraction

Details Solvent extraction Solvent extraction

2005-04-13

2008-03-25

Nguyen, Tam M. (Department: 1764)

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By plural serial diverse separations

C585S807000, C585S810000, C585S833000, C585S860000

Reexamination Certificate

active

07348466

ABSTRACT:
In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more than about 1.6 wt. %.

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patent: 4277315 (1981-07-01), Volkamer et al.
patent: 4348260 (1982-09-01), Hokari et al.
patent: 6395953 (2002-05-01), Koga et al.

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