Capturing and sequestering greenhouse gases opens new opportunities for pipeline infrastructures. Along corridors of industrial areas, plant-wide carbon capture systems will feed the captured anthropogenic CO2 into trunk lines that will transport the CO2 to locations where it can be stored safely, such as depleted reservoirs. In many ways, the trunk lines will resemble gathering systems running in reverse.

However, anthropogenic CO2 will be transported at pressures and temperatures that will be close to the fluid phase boundary, presenting problems for those wishing to model the process. Furthermore, there is currently no “go to” equation of state to model the fluid properties of the CO2 rich mixtures where the contaminants are a function of the capture process and its operational efficiency.

In this paper, we consider the fluid properties of pure CO2 and contrast those with the properties from a range of anthropogenic CO2 mixtures. The experience drawn from analysis of the fluid properties will be used to develop a simulation model of a full gas/dense phase CO2 pipeline system comprising both a gaseous/dense phase onshore gathering system and a dense phase offshore sequestration system.

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