Gas phase adsorption at activated carbon is mostly used for the recovery of organic components from water and air. Water vapour desorption is a fast method and in this method water and solvents can be separated by condensation in phase separator. Usually the activated carbon bed must be dried and cooled after vapour desorption. This method is applied with restriction on more fastidious solvents like ketones. Ketones tend to decompose on activated carbon especially at elevated temperatures. Using inert gas a desorption medium one can reduce the rate of decomposition. Usually nitrogen is used...