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etc.) can be selected to measure the viscosity from 0.3 to 2500 mPa s. The accuracy of temperature is 0.02 K, and the accuracy of viscosity is about 0.5%. The density of dry and aqueous [Amim][HCOO] was measured by an Anton Paar DMA 4100M vibrating-tube densimeter. The accuracies of temperature and density are 0.02 K and 0.0001 g·cm-3, respectively. The viscosity of dry and aqueous [Amim][HCOO] was measured by Bohlin CVO 100 rheometry. A cone-on-plate geometry was used with a 1o cone angle and 20 mm cone diameter. The lower plate has a diameter of 60 mm. The share rate is in a range of 1-300 s-1. 2.3 Gas solubility measurement The vapour-liquid equilibrium equipment was used to measure the gas solubility in a solvent. As illustrated in Figure 2.1, the apparatus consists of a gas reservoir, an equilibrium cell, a magnetic stirrer and two pressure transducers. The gas reservoir and equilibrium cell were placed in a water bath. Firstly, an accurate amount of solvent was loaded into the equilibrium cell. The volume of the solvent was determined by the mass and density at the temperature and pressure of interest. Secondly, the gas was introduced into the gas reservoir and the pressure was recorded with the pressure transducers. Thirdly, an amount of gas was introduced into the equilibrium cell and dissolved in the solvent. The pressure was measured with the pressure transducers. It was considered to reach equilibrium if the pressure remained a constant for 4 h. Finally, the moles of gas dissolved in the liquid phase were calculated from the pressure change in the gas reservoir, the equilibrium pressure and the volume of the equilibrium cell. During the experiment, the vapor pressure of dry or aqueous ILs was negligible. The uncertainties of the CO2 solubility measurement consist of the system errors of pressure, temperature as well as the volumes of gas reservoir and equilibrium cell. The precision of pressure transducers is 0.075 %, and the accuracies of temperature and volume measurements are 0.1 K and 0.5 ml, respectively. The overall uncertainty for the measured CO2 solubility was estimated to be within 1 %. 9PDF Image | CO2 Separation with Ionic Liquids
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