Abstract
Summary Solvents loaded waste gas streams can be purified by cooling. The two essential physical effects occuring here are condensation and desublimation (freezing out). If cooling of the waste gas is effected with cryogenic liguid nitrogen, waste gas temperatures lower than -140°c can be reached. Therewith the residual load of the waste gas is reduced to such an extent that the limits given in TA Luft (clean air act) of 1986 can be met for nearly all organic solvents. Lowering the temperature of a waste gas can be achieved by injecting liquid nitrogen into the waste gas stream, by direct cooling of a waste gas carrying heat exchanger with liquid nitrogen or by indirect cooling of a waste gas purification apparatus over an intermediate circuit. For continuous operation these systems have to be designed as alternately operating double systems to cope with the ice formation. with the new Crysumat (R)-K process this disadvantage has been eliminated. Here the solvents are continuously frozen out in a moving ball bed.
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