Xie Ying, a manufacturer of modified coal asphalt
Detection of quinoline insolubles in coal pitch: methods and processes.
1. Detection background.
Coal pitch is a by-product of coal tar processing that contains many useful chemicals such as quinoline and its derivatives. These compounds have a wide range of applications in industrial production, such as pharmaceuticals, pesticides, dyes, etc. However, the content of quinoline insoluble matter in coal pitch often affects its quality and performance. Therefore, the detection of quinoline insoluble matter in coal pitch is of great significance to ensure product quality and guide the industrial market.
Second, the purpose of testing.
The purpose of the detection of quinoline insolubles in coal pitch is to understand the content of quinoline insolubles in a sample, so as to judge its quality and performance. Through this inspection, it helps to optimize the production process, reduce costs, and improve product quality.
3. Detection methods and principles.
In this experiment, the titration method was used for detection. The method is based on the fact that quinoline is soluble in sulfuric acid solution at a certain temperature, while quinoline insoluble matter is precipitated in the form of precipitation. By titration, measurement and calculation, the content of quinoline insoluble matter can be obtained.
Fourth, the experimental operation procedure.
Sample preparation: Weigh a certain amount of coal pitch sample, grind it to fine particles and put it in a dry beaker for later use.
Instrument setup: Prepare burettes, volumetric flasks, triangular flasks, and electronic balances for experimental instruments, and check their accuracy.
Optimized experimental conditions: Volumetric flasks and burettes are dried in the oven and weighed accurately with an electronic balance. Put the sample into a volumetric flask, add an appropriate amount of sulfuric acid solution, shake well, and place it in a water bath to heat.
Data recording: Observe the change in the consumption of sulfuric acid solution during the titration and record the titration. At the same time, the temperature during the experiment was experimentally detected.
Data processing: Based on the titration and temperature data, the content of quinoline insoluble matter is calculated.
5. Data recording and analysis.
During the experiment, the following data should be recorded: sample mass, concentration and volume of sulfuric acid solution, temperature during titration, titration, etc. Through the analysis of these data, the content of quinoline insoluble matter and other relevant indicators can be obtained. Combined with these indicators, the quality and performance of coal asphalt can be evaluated.
6. Discussion of results.
According to the results of the experiment, it can be found that the insoluble quinoline in the coal pitch is closely related to its quality and performance. Within a certain range, the lower the content of quinoline insoluble matter, the better the quality and use performance of coal pitch. However, if the content of quinoline insolubles is too low, it may indicate that the amount of active ingredients in coal pitch is insufficient. Therefore, in actual production, the process parameters need to be adjusted according to the specific needs and actual conditions to obtain the best coal asphalt quality and performance.
7. Precautions and errors**.
In the process of experiment, the following points need to be noted: first, the accuracy and dryness of the experimental instrument should be ensured, and the experimental results should be distorted due to instrument errorsSecondly, the experimental conditions should be strictly controlled, such as temperature, concentration of sulfuric acid solution and titration speed, etc., to reduce the influence of experimental conditions on the resultsFinally, the experimental data should be recorded and processed in a timely manner to avoid inaccurate analysis results due to data loss or errors.
VIII. Conclusions.
In short, the detection of quinoline insolubles in coal pitch is one of the important means to evaluate its quality and performance. By using titration for detection and analysis, companies can be guided to optimize production processes, improve product quality, and reduce costs. In actual operation, it is necessary to follow strict detection indicators and carry out experimental operations in accordance with the prescribed procedures to ensure the accuracy and reliability of experimental results. At the same time, the analysis and summary of possible problems and errors** in the experimental process will help to improve the experimental efficiency and improve the accuracy of data analysis.