Improvement of Sulfur Detection Limits in Petroleum Products Using ASTM D 4045

摘要

To prevent the adsorption impediment of H_2S in the trace sulfur analyzer approved by ASTM D 4045, a specially prepared pure ceramic tube has been advanced to be the only usable reactor for hydrogenolysis procedure. However, a conventional ceramic tube becomes usable by inhibiting the H_2S adsorption on the basic impurities by a substitute adsorption of CO_2 that can be introduced continuously with H_2 in the ceramic reactor. Applying the OxyHydro procedure to reduce the carbon deposit in the analysis of kerosene, a large overestimation error occurred in the determination of a single ppb of sulfur even using the specially prepared pure ceramic tube. The overestimation error was completely eliminated by the continuous introduction of CO_2 with H_2, even using conventional ceramic reactors. By following procedures to suppress noise from the system, the original limit of detection of 25 ppb sulfur for the analyzer was improved to 0.3 ppb.