ESTIMATION OF VAPOR PRESSURES FOR AROMATIC HYDROCARBONS WITH CORRESPONDING STATES GROUP CONTRIBUTION METHOD

A new estimation method was proposed by combining corresponding state principle with group contribution method through introducing the concept of assumed-critical properties. Combining it with Riedel equation, a new vapor pressure correlation equation was developed with this method. Contribution values of 87 groups were obtained by correlating 5 254 vapor pressure experimental data of 349 organic compounds of 20 type substances including saturated hydrocarbons, unsaturated hydrocarbons, cyclohydrocarbons, aromatics, oxygen compounds, sulfurcompounds, nitrogen compounds, halohydrocarbons, etc, the total error is 1.35%. The new equation has advantge both corresponding state method and group contribution method. Predicted error for vapor pressures of 11 aromatic hydrocarbons show that the CSGC equation is only 2.16%.$$$$