Method for determining quinoline insoluble substances in coal pitch

Abstract

The invention relates to the technical field of chemical analysis, in particular to a method for determining quinoline insoluble substances in coal pitch, which comprises the following steps: continuously extracting toluene insoluble substances extracted by a toluene insoluble substance determinator in the coal pitch by using quinoline as a solvent to separate quinoline soluble substances from theinsoluble substances; and continuously washing the residual quinoline by using toluene, reducing the amount of the quinoline soluble substance, and calculating the content of the quinoline insolublesubstance according to the relationship among the toluene insoluble substance, the toluene quinoline soluble substance and the quinoline insoluble substance. According to the relationship between thetoluene insoluble substance and the quinoline insoluble substance, the determination steps of the toluene insoluble substance and the quinoline insoluble substance in the coal pitch are combined, so that the degree of harm to the environment and a human body during operation is reduced, the operation steps are simplified, and the manpower and time consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method for measuring quinoline insolubles in coal tar pitch. Background technique [0002] Our factory currently adopts the GB / T2293-2008 standard method to determine the quinoline insolubles in coal tar pitch. The national standard method is used to determine the quinoline insolubles in coal tar pitch. Hot quinoline suction filtration and hot toluene washing. The percentage of insoluble matter weight in sample weight is the percentage content of quinoline insoluble matter. In practice, it is realized that this method has disadvantages such as cumbersome operation, environmental pollution, and harm to human body. As determined by the national standard method, the filtration area is too small (the diameter of the filter paper is 8cm), which will affect the filtration speed and washing effect to varying degrees. At the same time, the amount of toluene used for washing...

AI Technical Summary

Problems solved by technology

In practice, I realized that this method has disadvantages such as cumbersome operation, polluting the environment, and endangering the human body.

As determined by the national standard method, the filtration area is too small (the diameter of the filter paper is 8cm), which will affect the suction filtration speed and washing effect to varying degrees. At the same time, the amount of toluene used for washing is small, and it is difficult to wash completely. error (slightly high)

The whole operation process is exposed to the air, and toluene and quinoline spread around after being heated, which brings many hazards to the operator

In addition, the hot-dissolved sample needs to be manually stirred for 30 minutes in a water bath, and then repeatedly suction-filtered with hot quinoline and hot toluene, which is cumbersome and labor-intensive.

Images