Method for recycling a paint recovery effluent

Details Method for recycling a paint recovery effluent Method for recycling a paint recovery effluent

1994-05-10

1996-02-20

Hruskoci, Peter A.

Liquid purification or separation

Processes

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

95188, 95189, 210712, 210724, 210930, C02F 166

Patent

active

054926262

ABSTRACT:
The object of the present invention is reuse of the filtrate of a paint mist-cleaning water mixture as cleaning water without reduction in concentration efficiency. According to the present invention, a waste paint-cleaning water mixture 2 available on trapping a water-based paint mist in cleaning water 1 is concentrated to recover the paint and the aqueous phase is recycled as cleaning water. In this system, the cleaning water prepared by reusing the aqueous phase is adjusted to an acid value of not greater than 10 and a pH value of 7.0 to 9.0. Controlling the amount of low molecular acid components in the aqueous phase in this manner prevents an abnormal viscosity increase in the filtration-concentration of the waste paint-cleaning water mixture.

REFERENCES:
patent: 4265642 (1981-05-01), Mir et al.
patent: 4378235 (1983-03-01), Cosper et al.
patent: 4750919 (1988-06-01), Patzelt et al.
patent: 4814092 (1989-03-01), Patzelt
patent: 4919691 (1990-04-01), Patzelt et al.
patent: 5259976 (1993-11-01), Bui et al.
patent: 5319017 (1994-06-01), Uenoyama et al.

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