Method for detecting contents of CO2 and H2S in desulfurization amine liquid

Abstract

The invention relates to a method for detecting contents of CO2 and H2S in desulfurization amine liquid. The method includes steps: using a 1mL gastight syringe for taking 0-3mL of gas-phase components from a headspace bottle and injecting into a sample inlet of a chromatographic instrument; after a sample enters a chromatographic column along with a carrier gas flow to be separated, using a TCD (thermal conductivity detector) for detecting a peak area of H2S (or CO2) in the gas-phase components, drawing a standard work curve by taking the peak area of the H2S (or CO2) as a horizontal axis and taking corresponding mass concentration of the H2S (or CO2) as a vertical axis, and quantifying according to an external standard method. The method for detecting the contents of CO2 and H2S in the desulfurization amine liquid has the advantages that the CO2 and the H2S can be detected at the same time, and simplicity in detection and high result reliability are realized.

Description

technical field [0001] The invention relates to a CO desulfurization amine solution 2 and H 2 The detection method of S content. Background technique [0002] Refining and chemical enterprises use N-methyldiethanolamine (MDEA) as a desulfurizer to absorb CO in dry gas and liquefied gas in the absorption device. 2 and H 2 S. Generally, desulfurization devices use 30% (W) MDEA solution (referred to as desulfurization amine solution) to absorb CO 2 and H 2 S, to absorb CO 2 and H 2 The desulfurized amine solution after S is called rich solution, and the rich solution is heated to desorb CO 2 and H 2 The desulfurized amine solution after S is called lean solution, and the desulfurized amine solution can be recycled. In order to monitor the desulfurization status of the device, check the desulfurization effect, and ensure that the sulfur content in petroleum products is qualified, refining and chemical companies need to measure the CO in the desulfurization amine liquid...

AI Technical Summary

Problems solved by technology

CO Determination by Direct Injection Chromatography 2 MDEA in the rich solution will pollute the injection port and the chromatographic column when the concentration is high, the injection liner needs to be cleaned regularly and the chromatographic column should be aged in time, and the analysis time is longer

Iodometric determination of H 2 When the S content is high, the sample processing time is long, the operation is cumbersome, and the measurement results are interfered by other substances in the sample.