The solubility of dichloromethane (CH2Cl2) in ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) at different temperatures and pressures was measured by intelligent gravimetric adsorption instrument. The NRTL equation was applied to describe the vapor?liquid equilibrium 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 model of waste gas containing dichloromethane by ionic liquid solvent was established, the applicable range of the model were temperature of 278.15~308.15 K and pressure of 0~0.1 MPa, 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 which provided the optimum data at normal temperature and pressure.
Binqi WANG Xiangping ZHANG Dawei SHANG Jianpeng FENG Hui WU Yanchun ZHANG Jianwei LI
. Efficient Recovery of Dichloromethane by [Bmim][PF6] and Process Simulation[J]. The Chinese Journal of Process Engineering, 2018
, 18(1)
: 82
-87
.
DOI: 10.12034/j.issn.1009-606X.217196
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