Evaluation of the CO2 Behavior in Binary Mixtures with Alkanes, Alcohols, Acids and Esters Using the Cubic-Plus-Association Equation of State

Abstract Knowledge regarding the high pressure phase behavior of CO 2 mixtures is of primary importance for designing, operating and optimizing many industrial processes, such as supercritical fluid extraction for pharmaceutical, food and biodiesel industries and oil recovery enhancement through CO 2 flooding. In the present work, it is investigated how the CPA EoS (Cubic-Plus-Association equation of state) can be used for an adequate description of the VLE of an extensive series of CO 2 binary systems containing n -alkanes, n -alcohols, esters and n -acids, in a broad range of temperatures and pressures. These families constitute a series of non-self associating, associating and cross-associating components whose potential associative interactions with CO 2 are evaluated here. A detailed investigation regarding the differing behavior of CO 2 depending on the nature of the second component and how the CPA EoS can best describe them is presented here, namely explicitly considering the CO 2 association and also evaluating also its different association schemes. It will be shown that it is important to consider CO 2 self- and cross-association to describe the VLE of n -alkane and small alcohol/CO 2 systems. However, it is not necessary to consider CO 2 association when dealing with systems of heavy alcohols, esters or acids. The CPA EoS provides very good results for the extensive range of CO 2 binary systems considered here using, for most of them, single, small, temperature independent, positive and chain length dependent binary interaction parameters.

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