Measurement Of The Viscosity And Density Of Mixtures Related PTA Manufacture At High Temperature With Pressure And Correlated Basic Study

Experiment liquid densities and viscosities of pure compound and theirmixtures are needed for the design of chemical processes in heat and masstransfers or fluid mechanics. This paper is about partial work supported byChinese Petroleum Chemical Engineering Company. It includes measurement ofdensityand viscosityrelated to the synthesize of PTA.Densities and viscosities of the ternary systems of p-xylene, acetic acid andwater (298.15～353.15 K) were determined under atmospheric pressure using avibrating U-shaped sample tube densimeter (model DA-505 U) and a Ubbelohdesuspended-level viscometer respectively. Density data were used in determinationof excess molar volume. Viscosity data were used to calculate deviation ofviscosity. Excess molar volume and deviation of viscosity were fitted by theRedlich-Kister equation. Treated acetic acid and water as one component, theternary system of p-xylene-acetic acid-water becomes the binary system ofp-xylene and acetic acid-water. Pseudo-excess molar volumes VpE andpseudo-deviations in viscosityΔηp were determined from VEandΔηdata.Two dual systems viscosities of p-xylene-acetic acid and the acetic acid -water were determined by falling-body viscometer with independently designedand the installment may apply under the high temperature high pressure condition(temperature range 313.15 ~ 473.15K, pressure scope 0.10 ~ 3.20MPa).Simultaneously the viscosities of the ternary system of p-xylene-acetic acid-waterat different compositions were also measured (temperature range 313.15 ~473.15K, pressure scope 0.10 ~ 3.20MPa). Then the viscosity data of the threesystems were fitted by different correlation equations and each system equationregression coefficient has provided convenientlyfor the engineering calculation.Furthermore, it is difficult to get viscosity data or correlation equations forliquid from boiling point to critical point. Therefore this article has carried on thedetailed consult to the viscosity literature and a pure empirical viscosity correlation method used for temperature from boiling point to critical point isproposed. For more than 2246 data points of 27 pure liquids used for theevaluation of the proposed correlations, the average deviation for the 27 pureliquids is 1.22%, and the average maximum deviation is 5.59%. The pureempirical viscosity correlation equation has achieved the very good computationprecision.