We improved our analysis method for benzene
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We use benzene as the raw material, in quantities of 4,000–5,000 tons per month. Due to the large volume of analysis work required, we have made improvements to the analysis methods specified in the national standards and are releasing them again; we hope that analysts in the same industry will share their opinions and suggestions. Previously, we followed the national standards, which involved analyzing boiling point, total sulfur content, and thiophene levels, and it took 1 hour per person to analyze one batch of samples. The improved method involves using gas chromatography to determine the contents, with the ability to simultaneously measure the amount of toluene as well. Carbon disulfide and thiophene are analyzed using gas chromatography with an FPD detector, while moisture content is determined by the Karl Fischer method. It takes only 15 minutes per sample per person. This not only saves analysis time but also enables more thorough analysis of benzene; since the standard methods may yield satisfactory results, many impurities with boiling points similar to that of benzene cannot be distinguished, and there is no quantitative determination of toluene content. As a result, the measurement of sulfur levels is unclear. By accurately quantifying both carbon disulfide and thiophene, it is possible to provide valuable data for the production department. I was wondering if anyone has a better method?
Great, our factory is the same as yours – what matters most is high precision; accuracy is sufficient, and the method for comparing results works well
We also use GC to measure the content of various impurities in benzene, and a KF moisture meter to determine the moisture content. However, we do not test for carbon disulfide; instead, we use a sulfur-nitrogen analyzer to measure the total sulfur content (with results available in just a few minutes). We also use a digital densitometer to determine the density of benzene. Overall, it’s also around fifteen to twenty minutes each time
We also have sulfur and nitrogen detectors, and their accuracy is fairly good. The main drawback, however, is that they are unable to separate carbon disulfide from thiophene; as a result, the analysis data provided have less value in guiding production processes