Analysis of Chlorine Content in Sulfur containing Wastewater by Wavelength Dispersive X-ray Fluorescence Spectroscopy

Analysis of Chlorine Content in Sulfur containing Wastewater by Wavelength Dispersive X-ray Fluorescence Spectroscopy: Sulfur containing wastewater mainly comes from the drainage of secondary processing units such as catalytic cracking, catalytic cracking, delayed coking, and hydrocracking in refineries, including tower top oil-water separators, rich gas water washing, liquid hydrocarbon water washing, liquid hydrocarbon storage tank water cutting, and stacked gasoline water washing. The drainage volume is not large, but the concentration of pollutants is high. In addition to containing a large amount of hydrogen sulfide, ammonia, and nitrogen, sewage also contains phenol and oil pollutants, and has a strong odor, which is corrosive to equipment.

Analysis of Chlorine Content in Sulfur containing Wastewater by Wavelength Dispersive X-ray Fluorescence Spectroscopy

Current analysis of refinery status

Sulfur containing wastewater mainly comes from the top oil-water separator, rich gas water washing, liquid hydrocarbon water washing, liquid hydrocarbon storage tank water cutting, and stacked gasoline water washing in secondary processing units such as catalytic cracking, catalytic cracking, delayed coking, and hydrocracking in refineries. The drainage volume is not large, but the concentration of pollutants is high. In addition to containing a large amount of hydrogen sulfide, ammonia, and nitrogen, sewage also contains phenol and oil pollutants, and has a strong odor, which is corrosive to equipment.

Wastewater contains high levels of sulfur (up to 5%), which can have a significant impact on the analysis of chlorine content. To accurately analyze the chlorine content in the sample, it is necessary to consider the impact of sulfur content on it and correct this impact through appropriate standards. In addition, iron, nickel, vanadium, lead, and chromium in sulfur-containing wastewater have a strengthening effect on chlorine, while silicon and phosphorus have an absorption effect on chlorine. If the content of these elements is high, we must also consider their impact on chlorine. The standard sample ratio also needs to fully consider the content of other elements in the sample, especially sulfur, iron, lead, and calcium.

Two solutions

Use wavelength dispersive X-ray fluorescence spectroscopy to analyze the chlorine content in sulfur-containing wastewater.

Three instrument information

Model: Supermini200 Wavelength Dispersive X-ray Fluorescence Analyzer

X-ray tube: 200W Pd target

Detector: F-PC flow proportional counter and SC flicker proportional counter

Sample type: Sulfur containing wastewater

Atmosphere: Helium

Four standard sample suggestions

Taking the sulfur content range of 0-5% and chlorine content range of 0-500ppm in the sample as an example, the preparation of standard samples is recommended. The recommended configuration scheme is as follows (this standard sample configuration scheme is only applicable to sulfur-containing wastewater without interference from other high content elements):

fiveAnalysis of Chlorine Content in Sulfur containing Wastewater by Wavelength Dispersive X-ray Fluorescence SpectroscopyPrecautions

1. Sulfur containing wastewater has certain acidity, alkalinity, and corrosiveness. It is necessary to investigate the tolerance of the selected sample film to it in advance. Generally, after preparing the sample, it can be used without wrinkles or damage after being left for 20 minutes.
2. The impact of sulfur on chlorine must be considered, otherwise it is difficult to obtain accurate chlorine content. The best calibration method is to use the standard configuration method recommended in Section 4 to configure the standard sample, and then use the absorption/enhancement calibration function of the Supermini200 analyzer to calibrate the impact of sulfur on chlorine.

3. If there are other high levels of unmeasured elements in the sewage, their potential impact on chlorine should also be considered, such as the possible high levels of iron, nickel, vanadium, lead, chromium, silicon, phosphorus, etc.