| Chlorinated organic compounds are widely used as mediums in chemical,medicine and battery industries.However,the inevitable emission of such organic wastes seriously threatens the environment and human health.There are low adsorption capacity and wastewater emissions in the traditional activated carbon fiber adsorption technology.Ionic liquids has the characteristics of nonvolatile,regulatable,and the thermal stability is good,which opens up a new way for the purification and recovery of organic gas.In recent years,more and more researches have been studied on the gas pollution control by ionic liquids.This work focuses on the treatment of chlorinated organic gas.The main work and results are as follows:In this work,we measured the solubility of dichloromethane(CH2Cl2)in ionic liquids at different temperatures and pressures by IGA.The NRTL equation was applied to describe the VLE of IL-CH2Cl2 system and the thermodynamic interaction parameters were regressed with experimental data.The calculated properties agreed well with experimental data,and the average relative deviation was 3.16%.Based on the results,the absorption and recovery process of waster gas containing dichloromethane by ionic liquid solvent was established,while the absorption at normal pressure and vacuum flashing for the recovery of CH2Cl2 was proposed.The operating parameters of the absorption tower were analyzed by simulation method,which provided basic data for industrial application.Based on the absorption of dichloromethane by ionic liquids and process simulation data,we make the pilot scale-up study and get good results.This technology has the characteristics of low energy consumption,short process,large absorption capacity and recyclable ionic liquids,which is suitable for the new technology promotion of chlorinegas.This study provides an important scientific support for the development and industrial application of the new technology for the recovery of chlorinated compounds by ionic liquids. |
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