Study On The Recycling Of CFC-11 From Refrigerator Waste

This paper has described the sources, hazards, domestic and international recycling approach of the CFC-11 from refrigerator waste; Summarized the activated charcoal textile fiber development survey as well as the activated charcoal textile fiber adsorption law processes CFC-11 the development survey, the reaction mechanism, the influence factor and the uniform temperature adsorption model. The aiticle also reviewed the spray and distillation in the application of exhaust gas recycling. In this foundation, the CFC-11 recycling plant simulation was established. CFC-11 recycling process, inculing adsorption, desorption, spray absorption and analytical separation were studied by the simulating experiments.In this paper, the viscose base activated charcoal textile fiber was taking as the absorbent. Adsorption, desorption, concentration, spray and analytical separation were made as the experimental device.In the adsorption experiment, the activated carbon fiber adsorption isotherm and the Freundlich isotherm equation are fitting satisfactoried. To cofirm the factors affecting the adsorption process, such as the gas volume flow rate, gas inlet concentration, fills height and carried on L9(33) orthogonal optimization. The result indicated that in the design experiment scope to the activated charcoal textile fiber adsorption CFC-11 influence successively the order is: gas volume flow rate﹥gas conceration﹥packed height. Screens this test installation best operation parameter is: The room temperature was 25℃, activated carbon fiber packing density was 101.9 kg/m3,fill height was 120 mm, CFC-11 volumetric flow rate was 0.2 m3 ? h-1, the average import concentration was 10 mg ? L-1.The results of desorption experiment show that the desorption temperature of 150℃was faster than 90℃desorption. In the gas volume flow rate of 0.05, 0.10, 0.15 m/s, 0.15 m/s was the best volume of desorption. The results of egeneration rate experiment show that the regeneration rate decreased while the using times increased. The recycling rates remained at 85%.The results of spray experiment show that while the amount of circulating spray was 15.7, 20.0, 25.0 L/min, absorption efficiency was 84%, 89%, 92%; When the import concentration was 100.4, 142.7, 160.1 mg/L, the absorption efficiency was 91%, 88%, 83%. Absorption efficiency of spray can reach 80%.The results of fractionation experiment show that in the distillation temperature of 50,70,90℃, the higher the temperature, the more complete distillation; recovery ratio increases with the increase of the solvent;however,when the solvent ratio increases to a certain value, the recovery rate changed little.On the basis of the experiment above, the whole process of gas adsorption, desorption, spray, distillation recovery were studied. The results show that gas adsorption and desorption process is relatively high in the recovery rate, reaches 90%. In the spray, the distillation recovery phase, the recovery rate decreased, only 60%. The total recovery rate of the whole recovery process was 35%.