Method for recycling cleaning fluid

Details Method for recycling cleaning fluid Method for recycling cleaning fluid

1994-03-18

1995-10-10

Dawson, Robert A.

Liquid purification or separation

Processes

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

210651, 210653, 210655, 2101952, 2102572, 210641, 21050023, 210805, 134 10, 134 40, B01D 6100

Patent

active

054568420

ABSTRACT:
A method and apparatus for recycling water based workpart cleaning fluid of the type used to wash workparts (B) free of soils, such as emulsified and non-emulsified cutting oils and lubricants, particulate matter and other hydrophobic fluids. A parts washer (12) is provided for cleaning workparts (B) contaminated with soils. The contaminated cleaning fluid is discharged from the parts washer (12) in a slip stream and directed to a process tank (22). The contaminated cleaning fluid is pumped from the process tank (22) to a prefilter (28) where large particles are screened. The cleaning fluid is then directed to regenerated cellulose membrane filters (34) where the water based cleaning fluid and the hydrophilic water soluble substances in the base, i.e., the detergents, are imbibed through the membrane (34) as permeate while the soils pass as retentate. The permeate is returned to the parts washer (12), whereas the retentate is directed back to the process tank (22).

REFERENCES:
patent: 4846976 (1989-07-01), Ford
patent: 4857081 (1989-08-01), Taylor
patent: 4886603 (1989-12-01), Taylor
patent: 4976869 (1990-12-01), Taylor
patent: 5043072 (1991-08-01), Hitutsuyamagi et al.
patent: 5076932 (1991-12-01), Taylor
patent: 5158681 (1992-10-01), Freeman et al.
patent: 5271842 (1993-12-01), Degen et al.

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