Distillation: processes – separatory – Including purging of the system
Patent
1988-06-03
1990-12-25
Bascomb, Wilbur
Distillation: processes, separatory
Including purging of the system
203 40, 203 95, 203100, 203DIG8, 34 32, 34 40, 34182, 110341, 159 163, 159 473, 159DIG29, 210806, 427345, 432215, B01D 100, F26B 332
Patent
active
049800302
ABSTRACT:
A method and apparatus are disclosed for the treatment of paint sludge and for reducing volatile organic compound emissions from a paint spraybooth operation, thereby obtaining a recyclable material for use in new coating products. In such an operation, uncured paint resins mixed with volatile organic compounds are sprayed onto an article to be painted and at least a portion of the overspray is mixed with water to form a waste stream containing water, uncured paint resin, volatile organic compounds and inorganic substances. The method includes the steps of: removing a portion of the water and liquid volatile organic compounds from the waste stream; heating the resultant sludge to volatilize the residual water and liquid volatile organic compounds and to cure the uncured paint resin; collecting the residual solids stream, and removing all of the volatilized organic compounds from the resultant stream, thereby generating a volatile organic compound-free gas effluent. The amount of volatized organic compounds removed is at least about 5% of the volatile organic compounds input to the paint spraybooth operation.
The apparatus includes a waste paint stream dewatering device and an enclosed rotary screw heat exchanger maintained in an inert environment; the apparatus also provides a system for adding a scouring aggregate to the sludge before heating and for removing the aggregate after heating. Finally, the apparatus includes a separator for removing entrained solids from the resulting gas stream, and provides a system for processing the gas stream to remove all volatile organic compounds.
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Johnson Jeffrey C.
Slater Andrew
Bascomb Wilbur
Haden Schweitzer
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