Method for determining content of soluble hydrogen sulfide in desulfurization solution

Abstract

The invention discloses a method for determining the content of soluble hydrogen sulfide in a desulfurization solution. According to the technical scheme disclosed by the invention, an oxidation-reduction method is matched with an automatic potentiometric titrator for titration, but two different processes are respectively used for determining the content of hydrogen sulfide in amine-poor liquid and amine-rich liquid, the process for the amine-poor liquid comprises the steps of sampling and sample preparation, titration and blank control, and the process for the amine-rich liquid comprises thesteps of sample pretreatment, sampling and sample preparation, titration and blank control. The invention provides the novel method for determining the content of soluble hydrogen sulfide in a desulfurization solution. A sodium thiosulfate standard solution is used as a standard solution for titration, so that the titration cost is reduced; an automatic titrator is introduced, so that the titration end point is accurate; the titration analysis result of the method is good in stability and reproducibility.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, in particular to a method for measuring the content of soluble hydrogen sulfide in desulfurization liquid. Background technique [0002] In petrochemical refineries, dry gas and liquefied gas need to remove hydrogen sulfide. The removal of hydrogen sulfide mainly adopts alcohol amine method. The desulfurization solvent in the desulfurization liquid is N-methyldiethanolamine (MDEA). MDEA absorbs hydrogen sulfide After that, it becomes a rich amine liquid. The rich amine liquid is heated in the regeneration unit to re-precipitate acid gas, and the amine liquid is regenerated to become a lean amine liquid. The fluctuation of the hydrogen sulfide content in the desulfurization liquid has a great impact on the energy consumption of the regeneration unit. , therefore, it is very necessary to accurately detect the content of hydrogen sulfide in the desulfurization liquid. [0003] The trad...

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Problems solved by technology

[0011] The problem with the traditional method is: when using sodium thiosulfate standard solution for titration, because the titration end point is judged by the color change of the indicator, and different people have different judgments on the color change of the indicator, even the same person, for the same The reproducibility of the results is still unsatisfactory if the sample to be tested is judged by multiple titrations, and iodine solution and starch indicator need to be consumed. The more times of determination, the higher the cost

Compared with the traditional technical scheme, this technical scheme has the advantage of being able to judge the titration end point more accurately. In fact, the technical problem to be solved by this technical scheme is to find a reasonable titration parameter for determining the hydrogen sulfide content in the desulfurization liquid by combining the precipitation method with the potentiometric titration method. problem, and the reagent used in this technical solution is silver nitrate standard solution, in the long run, the cost is higher

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