Liquid-vapor (LV) and liquid-liquid (LL) phase equilibria in the carbon dioxide + pyrrole system were measured at temperatures between 313 K and 333 K, and pressures between 8.4 MPa and 15.1 MPa. The data were used to predict the overall phase behavior of the system using the Patel-Teja equation of state and the Mathias-Klotz-Prausnitz mixing rules with two temperature-independent parameters. The calculations suggest that the carbon dioxide + pyrrolesystem may exhibit type IV phase behavior according to the classification of Scott and van Konynenburg. (C) 2008 Elsevier B.V. All rights reserved.