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In order to solve the problem of distillation separation of hydrogenated pine resin, the vapor-liquid equilibrium data of the hydrogenated pine resin system were measured at atm. pressure and temperatures from 169.2 to 176.2°C using a modified Ellis equilibrium kettle with stirring and a gas chromatog. anal. method.NRTL, Wilson and UNIQUAC models were used to correlate the vapor-liquid equilibrium data thermodynamically.Separation difficulty of monoterpene and sesquiterpene hydrocarbons was judged by relative volatility.The results show that the vapor-liquid equilibrium data of the hydrogenated pine resin system obtained by the Herington integration method are consistent with the thermodn.When calculated using the NRTL, Wilson and UNIQUAC models, the mean absolute deviation of the gas-phase mole fraction was 0.0121 with a maximum deviation of 0.0373, and the mean absolute deviation of the temperature was 1.5°C with a maximum deviation of 2.8°C, which indicates that the three models are applicable to the hydrogenated pine resin system.The relative volatility of monoterpene hydrocarbons and sesquiterpene hydrocarbons ranged from 1.924 to 2.146, thus it is difficult to sep. monoterpene hydrocarbons from sesquiterpene hydrocarbons.

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