Abstract: The present invention relates to a process for reducing the content of gaseous acid pollutants soluble in water and contained in fumes discharged from an incineration plant, in the course of which the said fumes are cooled by means of indirect heat exchange with a cold fluid, thus producing a condensate containing acid pollutants, and in which, after this cooling stage, the said fumes still containing acid pollutants are washed using the condensate as washing liquid.

Abstract: Procedure for the denaturation of paints collected in painting booths and comprising a cleansing apparatus in which the air laden with paint droplets is placed in contact with a fluid to which is added a powder selected from phenolic or polyisocyanate powders.Applications to the denaturation of paints in painting booth installations.

Abstract: A device for purifying contaminated gas, such as air drawn from an automobile painting tunnel and containing a mist of paint particles, includes an upper water feed orifice 1 connected to a lower flow channel 4 by an intermediate channel 3 which diverges progressively from top to bottom. A horizontal, transverse wall 8 is positioned beneath the feed orifice at a downstream section of the intermediate channel. Water falling against the wall splashes out in a curtain of droplets through which the air must pass, with the paint particles thus being entrained in the droplets and removed from the air flow. The low divergence angles of the intermediate channel ensures the continuous wetting of its walls to prevent clogging.

Abstract: Garbage incinerator fumes containing water vapor and HCl are drawn downwardly over a cooled tube bundle (41) in a vertical heat exchanger (4), whereat the water vapor condenses and the HCl dissolves in the condensate, which then falls into a collection reservoir (43) for siphon removal. The fumes are maintained above their dew-point temperature throughout the process.

Abstract: A process is provided for denaturing paints which are collected in paint rooms of the type comprising a scrubber in which air charged with droplets of paint is brought into contact with a scrubbing liquid. An additive in the form of an expanded polyurethane powder is included in the scrubbing liquid. The apparatus includes an arrangement for injecting the expanded polyurethane powder into the scrubbing liquid at the top of the scrubber.

Abstract: A device is provided for scrubbing a polluted gas in which this gas passes through at least one sheet of a scrubbing liquid. The device comprises trickle walls (7) which together define a first opening (8), a first transverse wall (12) disposed beneath the first opening, and a trickle passage with a vertical axis, surrounding the first transverse wall, and limited by two confining walls (10) attached to the underside of the trickle walls on either side of the first opening. Inside the trickle passage, under the first transverse wall (12), further walls (15) are arranged defining a second opening (16), with a second transverse wall (17) being disposed beneath the second opening.