测定煤沥青甲苯不溶物时萃取终点的确定

End Point Determination for Measurement of Toluene Insoluble in Coal Pitch

用正交试验求得煤沥青甲苯不溶物的最佳测量条件,指出萃取次数可作为萃取终点的定量方法,与ASTM标准相比较,该法甲苯不溶物的极差远低于ASTM法的要求精度。

The best measuring conditions for the toluene insoluble in coal pitch is obtained by orthogonal test. If is pointed out that the number of extractions can be used as quantitative method for extraction end point. In comparison with ASTM method, the polar difference of the toluene insoluble in the method is much lower than the accuracy required in ASTM method.