Recovery Of Volatile Organic Vapor Compounds From Reactor-Systems By Combination Of Microbubble Absorption And Activated Carbon Fiber

Industrial waste gases are considered as important resources of air pollution and among them the organic waste gases are one class of the most difficult components to be treated. In this thesis, the absorption of microbubble technology and the adsorption of activated carbon fibers (ACF) were combined and used to recovery of the organic vapor compound from reactor-systems by using as acetone-air mixture as an example to simulate organic waste gas and to reveal the influences of operation parameters on the gas treatment efficiency.In the process of acetone absorption by the microbubble technology, the diameter distributions of microbubbles at various conditions were measured by high speed camera and the effect of acetone was explored. The results showed that the average diameter of microbubbles decreased and the number density of bubbles within the aqueous absorption liquid increased with the increasing of the superficial gas velocity and the concentration of acetone in water. By using a microporous plate with pore diameters of about 3 to 4μm, when the concentration of acetone in water was in the range of 1% to 3% and the superficial gas velocity was maintained at 10.2 m/s, microbubbles with diameter of 300 to 700μm were generated successfully.During the process of acetone absorption using ACF, the effects of mass fraction of acetone and gas flow velocity on the absorption efficiency of acetone were investigated. The results showed that the absorption efficiency of acetone changed with the increasing of mass fraction and gas flow velocity.Combining these two processed, most amounts of the acetone were recoveried from the waste gas during the microbubble absorption stage. The superficial gas velocity, the mass fraction of acetone and the mass of water affected the absorption efficiency of acetone. In a glass absorption column with inner diameter of 50 mm and height of 800 mm with the microporous plate for the generation of microbubbles and water was used as the absorber liquid, when the mass fraction of acetone in air-acetone waste gas was 1000 ppm and 1200 ppm and the mass of water of 300 g, the absorption efficiencies of 69.5% and 77.2% were observed at the superficial gas velocity of 10.2 m/s, respectively. The absorption efficiency increased with the increasing of acetone mass fraction and gradually increased with the increasing of the mass of water. The optimum conditions with the superficial gas velocity of 10.2 m/s, the mass fraction of acetone of 1200 ppm and the water mass of 450 g were obtained and under these conditions the acetone absorption efficiency reached 88.1%. The further adsorption efficiency of acetone by ACF was about 137 mg per g ACF and by the combination the total acetone removal efficiency was 89.5% in the whole process.