Circulation measurement of gas-liquid equilibrium for dilute SO_2 in ethylene glycol

A closed gas circulation system(GCS) was designed for measuring the gas-liquid equilibrium(GLE) of dilute SO2(≤4.51×10-2 mol/m3).The gas chromatogram calibration curves for GCS were established by varying temperature and pressure.GLE data of dilute SO2 were investigated in GCS at 25 ℃ and 101.86-144.53 kPa.The closed gas circulation system shows that GLE relationship is in good agreement with the quadratic equation.The GCS is easy for operation,the concentration of dilute SO2 in gas can be fleetly and accurately determined,and benefits for the investigation of GLE of dilute SO2.