P-T-x-y data for the binary system n-heptane + 2-propanol were measured near the critical temperatures (483.15, 498.15, 508.15, and 523.15) K using a two-phase recirculating apparutus. We observed critical points at 508.15 and 523.15 K. The experimental data were correlated by the Peng-Robinson-Stryjek-Vera (PRSV) equation of state combined with the NRTL model and the Wong-Sandler mixing rules. We also calculated the critical points and presented the critical locus.