SYNOPSIS: -The viscosity of coal-derived oil is one of the fundamental data for the design of coal liquefaction plant. In this paper, the prediction method of the viscosity of middle oil fractions from coal-derived oils was investigated.
SYNOPSIS: -The viscosity of coal-derived oil is one of the fundamental data for the design of coal liquefaction plant. In this paper, the prediction method of the viscosity of middle oil fractions from coal-derived oils was investigated.
Coal tar distillates and coal liquefaction products were distilled into a number of fractions with narrow boiling range. The viscosity of each fraction was measured in the temperature range from 40 to 100°C by using a rotating rheometer. The logarithms of the viscosity varied linearly with the logarithms of the temperature for middle oil fractions in the mean boiling point (50 vol% off temperature) range from 200 to 375°C. Each of the straight line converged to a specific point (245°C, 0.42mPa.s) and the gradient of the straight line depended on the mean boiling point of each fraction.
Using these results, the following equations were deduced for predicting the viscosity of the middle oil fractions from coal tar or coal liquefaction product at an arbitrary temperature.logη=2.389-log t/2.389-log t1 (0.3768+log η1)-0.3768 (1)
logη= (2.389-log t) 10
n-0.3768n=0.00350
b50-0.8451 (2)
The viscosity (mPa. s) at an arbitrary temperature t (°C) can be calculated from eq.(1) if the viscosity at a certain temperature t1 is known, or from eq.(2) if the 50 vol% off temperature tb50 (°C) of the fraction is known.
A nomogram for the same purpose was also constructed. The estimation of the viscosity can be made using tb50 of the fraction, and a more accurate value will be obtained if the viscosity at a certain temperature is known.
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