High Pressure Phase Behavior of Carbon Dioxide in Carbon Disulfide and Carbon Tetrachloride

Theknowledgeaboutthenatureoftheinteractionsbetweencarbondioxide(CO2)anddifferentorganicmoleculesis of relevance for designing, operating, and optimizing many industrial processes. In fact, numerous studies concerning the interactions of CO2 with other compounds have been presented, using both experimental and theoretical approaches. As part of a continuing effort to fully understand the interactions between CO2 and different compounds, the high pressure phase equilibria of CO2 binary systems containing carbon disulfide (CS2) and carbon tetrachloride (CCl4) were here investigated, involving experimental measurements of high pressure phase equilibria and modeling with the cubic plus association (CPA) equation of state (EoS). The CCl4 and CS2 were chosen due to their similar structure to CH4 and CO2, respectively, allowing to anticipate the interactionsbetweenlikeandunlikemoleculesthatcanbefoundatbinaryandmulticomponentsystemsconstitutedbyCO2and/or CH4. It was found that CO2 þ CS2 presents strong positive deviations to ideality while the CO2 þ CCl4 system presents an almost ideal behavior.