Gas-liquid Equilibria Of Two Binary Systems Of Carbon Dioxide + 1,2-Propanediol And Carbon Dioxide+ Glycerol

The high-pressure gas-1iquid equilibrium for two binary systems including CO₂+1,2-propanediol,CO₂+glycerol at the temperature range of 303.15 K³43.15 K and 2.00 MPa¹0.00 MPa were investigated experimentally with a high-pressure variable-volume autoclave.The phase equilibrium data including molar composition of gas phase and liquid phase,molar volume,density and distribution ratio of gas and liquid in two phase were determined.At the same time,the experimental data were simulated by PR equation,SRK equation and UNIQUAC equation with Aspen plus.The results show that:at the constant pressure,the solubility of carbon dioxide in the1,2-propanediol,glycerol in the liquid phase decreases gradually as temperature increases.However,the solubility in the gas phase between 1,2-propanediol,glycerol and carbon dioxide less affected with temperature changing.At the constant temperature,with the increase of pressure,the solubility of carbon dioxide in the1,2-propanediol,glycerol increases,thus the density of liquid phase decreases,molar volume increases.But the solubility of 1,2-propanediol,glycerol in carbon dioxide in gas phase increases gradually,therefore the density of the gas phase increases,molar volume decreases.The study improves the phase equilibrium data for binary system containing CO₂ and alcohol.At the same time,these will play an important role for increasing productivity in the production of propylene carbonate and glycerol carbonate,and optimize the technological design.In addition,this paper can provide the basic thermodynamic data for exploring phase equilibrium data in the binary systems containing CO₂,and it is helpful for simulating the multiple-component gas-liquid phase equilibrium.