Method and apparatus for enriching compounds of low water solubi

Details Method and apparatus for enriching compounds of low water solubi Method and apparatus for enriching compounds of low water solubi

1981-08-18

1983-12-20

Spear, Jr., Frank A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210909, B01D 1100

Patent

active

044216491

ABSTRACT:
The invention relates to a method and apparatus for enriching compounds almost insoluble in water, particularly chlorinated hydrocarbons, and thereby removing them from aqueous suspensions of solid particles contaminated by such compounds. The aqueous suspension is brought in contact with an organic hydrocarbon containing solvent, and the suspension is extracted with the organic solvent in one or more mixing stages with subsequent phase separation. Each stage comprises one or more mixing sequences in series arranged upstream of a phase separation and from where a substantial part of the organic solvent is recirculated to the first mixing sequence within that stage. The invention secures nearly complete leaching of compounds present in even less than 10% of other solid particles in an aqueous suspension.

REFERENCES:
patent: 3931001 (1976-01-01), Winn
patent: 4219418 (1980-08-01), Pilon
Cremer, Chemical Engineering Practice, vol. 5, 11-24-58, pp. 478-487, 210-634.

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