The commonly used methods for analyzing total sulfur include:; Microcoulomb method, lamp burning method, oxygen bomb method, ability dispersive X-ray fluorescence method, ultraviolet fluorescence method, etc.
Lamp burning method:
Suitable for determining the sulfur content of light petroleum products (gasoline, kerosene, diesel, etc.) with Reid vapor pressure not exceeding 60mmhg column.
Method summary: Burning petroleum products in a lamp, absorbing the generated carbon dioxide with sodium carbonate aqueous solution, and measuring it using volumetric analysis.
Microcoulombic method
The optimal conditions for measuring sulfur-containing oil samples using Coulomb titration method are: furnace temperature of the cracking section at 1000 ℃, air flow rate of 1L/min,
The residence time of the cracking section shall not be less than 2.5 minutes. The sampling amount for low sulfur oil (with sulfur content less than 1%) is 10-20mg, the sampling amount for medium sulfur oil (with sulfur content between 1% and 2%) is 9.5-11.5mg, and the sampling amount for high sulfur oil (with sulfur content greater than 2%) is about 5.5mg. The combustion is relatively complete, and there is no carbon deposition. The measurement results are relatively accurate.
X-ray spectroscopy:
Energy dispersive X-ray fluorescence spectroscopy is a widely used detection method for sulfur content determination, with a range of 0.05%~5%. This method has a high degree of automation, a simple and feasible detection method, and a short time
Method summary: This method places the product sample in the X-ray beam of the X-ray source, selects the standard curve and measurement time, determines the intensity of the sulfur Ka characteristic spectral line, and compares it with the calibration intensity to determine the sulfur content concentration mass percentage of petroleum products. The method is simple and easy to implement, with low labor intensity, fast analysis, and high work efficiency.
Oxygen bomb method
Suitable for determining the total sulfur content of heavy petroleum products such as lubricating oil and heavy fuel oil
Method summary: The sample is burned in an oxygen bomb, washed out with distilled water, and then precipitated with barium chloride to determine the sulfur content in the sample
Method characteristics: ① Mainly used for measuring samples with high sulfur content. ② The measurement time is long and complex
UV fluorescence detection method
The UV fluorescence sulfur analyzer combines the principles of UV fluorescence spectrophotometry and spectrophotometry, and can accurately measure sulfur content. It mainly detects the sulfur content of unknown substances through spectral analysis.
The principle of ultraviolet fluorescence is used to determine the total sulfur content, which is suitable for testing the sulfur content of gasoline and diesel, including national V standards. Can be widely used for the determination of crude benzene, coal tar, gasoline, diesel, lubricating oil, crude oil fractions, liquefied petroleum gas, coal gas, natural gas, plastics, petrochemical products, and other applications;