Research On Purification Of Ortho Dichlorobenzene By Activated AC And ACF

Ortho-Dichlorobenzene is a kind of common organic compounds. As a kind of common organic solvent, it was widely used in the dye, medicine, rubber, agriculture, coating light industry and other industries. It is also a kind of common organic intermediates root in process of industrial manufacturing, achromatic colour, easy to volatile and lead to air pollution. O-DCB has respiratory irritation, headache, appear dizziness, vertigo, anxiety, narcotic effects and so on, by which caused ways of through the skin, eyes, inhaled, eating into the biology, the maximum allowed concentration of O-DCB is50ppm in the air, high concentration can cause severe poisoning, long-term inhaled O-DCB could cause liver and kidney damaged. At present, adsorption method was widely applied for treatment of volatile organic pollutants with high concentration in our country, and enterprises can utilize adsorption method to recycle organic solvent for reuse of resources.On the basis of domestic and international literature review in this paper, new efficient absorbent was preparated from modification of activated Carbon and activated Carbon Fiber. Such as:H2O2, KOH, KMnO4, CuCl2, CoCl2modification, a series of modified absorbents activity were obtained.Used fixed adsorption bed for evaluating adsorption performance, and studied effect of adsorption caused by the different modification methods.Effect of modification process parameters on adsorption of O-DCB in the process of modification was studied. Analyzed the adsorption mechanism by using Langmuir, Freundlich and Temkin isotherm equation Fitting the modified adsorbent of O-DCB data respectively and Use Weber-Morris equation, Langmuir rate equation and Elovich equation fitting kinetics data respectively. Finally, surface chemical analysis was studied by Fourier transform infrared spectroscopy (FTIR).The experimental results show that:adsorption performance of O-DCB on AC-X and ACF-X had been improved. H2O2best modified conditions was30%, O-DCB adsorption capacity had been increased33.3%and28.8%, its breakthrough time had been increased75%and50%; KOH best modified conditions was0.1mol/L, O-DCB adsorption capacity had been increased63.75%and55.79%, its breakthrough time had been increased150%and75%; KMnO4best modified conditions was0.08mol/L, O-DCB adsorption capacity had been increased51.88%and52.01%, its breakthrough time had been increased125% and75%; CuCl2and CoCl2best modified conditions was0.1mol/L, O-DCB adsorption capacity had been increased34.10%and33.33%,38.90%å'Œ36.13%,its breakthrough time had been increased100%and50%,125%and67%.The thermodynamics experimental results show that:adsorption of O-DCB on adsorbents was complied with the Langmuir adsorption isotherm equation before and after the modification, indicating that the adsorption process was in situ single molecule layer absorption. qm of the modified adsorbents through Langmuir forecast show that:surface adsorption of acupuncture points of AC-X and ACF-X are greatly improved. The kinetic experiments results show that:adsorption of O-DCB on AC and ACF were complied with the Weber-Morris equation, indicating that the adsorption was controlled by the internal diffusion; adsorption of O-DCB on AC-X and ACF-X were complied with the Elovich equation, indicating that the adsorption was controlled by the chemisorptions.FTIR spectroscopy results show that:adsorption of O-DCB on AC-X and ACF-X had chemisorption.