Purification of PCNB by solvent extraction
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United States of America Patent
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Oct 15, 1991
Grant Date -
N/A
app pub date -
Jun 8, 1990
filing date -
Jun 8, 1990
priority date (Note) -
Expired
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Abstract
Pentachloronitrobenzene (PCNB) is purified by using a liquid-liquid extraction process with polar and nonpolar solvents to remove hexachlorobenzene (HCB). A variety of procedures, solvents and equipment may be employed to carry out the process. A process using a multiplate countercurrent liquid solvent extraction unit, and using DMF and octane as solvents for PCNB and HCB, respectively, is preferred.
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