Diesel refining: What are the reasons for the significant fluctuations in hydrogen sulfide levels in the pre-desulfurization cycle recently?
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There are no significant changes in the other parameters; the hydrogen sulfide level before treatment was consistently around 2000–3000, while it was 0 after treatment. Recently, it has risen to 6000 before treatment, fluctuating between 2000 and 6000, and it remains in the single digits after treatment. The amount of lean liquid remains normal, fluctuating around half a ton. Normal timing sample. There are no significant changes in the raw materials. In our laboratory, we use test tubes to prepare samples for hydrogen sulfide testing; we’re seeking advice from those who are more experienced on this forum regarding the possible reasons for this.
We have encountered similar situations here as well; we need to check whether the sampler is carrying liquid while sampling, as even a small amount of liquid can significantly affect the accuracy of the sample analysis
Using test tubes for hydrogen sulfide analysis relies heavily on the operator; we have encountered situations where the hydrogen sulfide levels measured during the day were high, while they were low at night. Could this be because the same person was responsible for sampling and conducting the analysis? It turned out later that the laboratory technicians at night are not very good at conducting analyses. So I suggest you have the analysis supervisor conduct two analyses on-site to see the results. Under normal operating conditions, hydrogen sulfide levels cannot experience such large fluctuations.
The sulfur content in your raw materials must have increased, which in turn raises the reaction temperature; as a result, the hydrogen sulfide concentration in the recycle hydrogen before desulfurization goes up
We collect samples using sampling bags, and then the laboratory uses a syringe to transfer them into hydrogen sulfide test tubes for observation
We only do it after stripping; sampling before stripping is too dangerous
Sampling before desulfurization: high hydrogen sulfide levels, as well as issues with the sampling for analysis, can also lead to significant errors
How can one check if the hydrogen sulfide level is low?