To cite this article: M. A. Motin , M. Azhar Ali & Shila Sultana (2007) Density and excess molar volumes of binary mixtures of sulfolane with methanol, n -propanol, n -butanol, and n -pentanol at 298.15-323.15 K and atmospheric pressure, Densities, and excess molar volumes, V E of the binary mixtures of sulfolane, þmethanol, þn-propanol, þn-butanol, and þn-pentanol were measured at temperatures 298. 15, 303.15, 308.15, 313.15, and 318.15 K, respectively, covering the whole composition range except methanol at 303.15-323.15 K. The V E for the systems were found to be negative and large in magnitude. The values of V E of the sulfolane, þn-butanol and sulfolane, þn-pentanol mixtures are being positive at lower and higher mole fractions of the alkanols (x 2 ). The magnitudes of the V E values of the mixtures are in the order sulfolane þ methanol > sulfolane þ n-propanol > sulfolane þ n-butanol > sulfolane þ n-pentanol. The observed values of V E for the mixtures have been explained in terms of (i) effects due to the differences in chain length of the alcohols, (ii) dipole-dipole interactions between the polar molecules, and (iii) geometric effect due to the differences in molar volume of the component molecules. These are more noticeable in the case of lower alcohols. All these properties have been expressed satisfactorily by appropriate polynomials.
Viscosity and Density are important physical parameter of crude oil, closely related with the whole processes of production and transportation, and are very essential properties to the process design and petroleum industries simulation. As viscosity increases, a conventional measurement becomes progressively less accurate and more difficult to obtain. According to the literature survey, most published correlations that are used to predict density and viscosity of heavy crude oil are limited to certain temperatures, API values, and viscosity ranges. The objective of present work is to propose accurate models that can successfully predict two important fluid properties, viscosity and density covering a wide range of temperatures, API, and viscosities. Viscosity and density of more than 30 heavy oil samples of different API gravities collected from different oilfield were measured at temperature range 15 o C to 160 o C (60 o F to 320 o F), and the results were used to ensure the capability of proposed and published correlations to predict the experimental viscosity and density data. The proposed correlation can be summarized in two stages. The first step was to predict the heavy oil density from API and temperature for different crudes. The predicted values of the densities were used in the second step to develop the viscosity correlation model. A comparison of the predicted and actual viscosities data, concluded that the proposed model has successfully predict all data with average relative errors of less than 12% and with the correlation coefficient R 2 of 0.97, and 0.92 at normal and high temperatures respectively. Meanwhile, the results of most of the available models has an average relative error above 40%, with R 2 values between 0.19 to 0.95. These comparisons were made as a quality control to confirm the reliability of the proposed model to predict density and viscosity values of heavy crudes when compared with other models.
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