The study presents p-T-x-y phase equilibria measurements of one solvent, chlorobenzene, and one solute, hydrogen chloride. The technique of the equipment used is based on a "static-analytic" method that takes advantages of two capillary samplers linked to a gas chromatograph. Measurements were done at three temperatures (353.16, 403.16, and 453.25 K) and pressures from 0.6 to 6.5 MPa. The experimental data measured were successfully correlated using the Peng-Robinson equation of state.