Mixed Fluids of Water and Carbon Dioxide

Abstract

Equations of state, miscibilities, and speciation in mixed fluids of water and carbon dioxide are discussed. A shift in speciation away from solvated molecules of carbon dioxide increases miscibilities. HKF theory as currently formulated is found incapable of properly handling high pressure data, as partial molal volumes asymptote to a constant value with increasing pressure. Current knowledge of the miscibility surface allows an easy quantification of the fractions of water and carbon dioxide loaded into a diamond anvil cell, and thus should facilitate further research into these mixtures.