[Process of adsorption and separating recovery solvents from vapor mixture directly]

Experiment on process feasibility of adsorption and separating recovery of organic compounds directly from waste gas was conducted with the activated carbon column train consists of 4 units in serial. Isopropyl alcohol and toluene vapor mixture was used as target gas, which are the common constituents of the gas emitted from fine ceramic manufacture. The experimental results showed obvious adsorption stratification phenomena alone the activated carbon column length for the vapor mixture. Under the condition of superficial gas velocity of 0.42 m x s(-1), inlet concentration of 477 mg x m(-3) and 746 mg x m(-3) for isopropyl alcohol and toluene respectively, 26 cm total carbon packing length of the four column serial train, when the adsorption time reached 798 min, the adsorption capacities for toluene and isopropyl alcohol are 184.5 mg x g(-1) and 0 mg x g(-1) respectively in 0-10 cm section, and 0.92 mg x g(-1) and 91.2 mg x g(-1) respectively in 21-26 cm section, liquids with over 99% purity of isopropyl alcohol and toluene were recovered separately from the two end columns of the carbon column train. There is a gaseous concentration amplifier zone in the carbon column for the weaker adsorbate, isopropyl alcohol, which make the adsorption capacity of isopropyl alcohol increase over 27% in part of the down flow zone in this experiment. It is possible to directly recover the pure solvent liquid separately from the vapor mixture by the way of a serial adsorption column with separating stage recovering.