Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1990-06-08
1991-10-15
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210909, B01D 1104
Patent
active
050572229
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.
REFERENCES:
patent: 4842696 (1989-06-01), Cazares
Amvac Chemical Corporation
Spear Frank
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