Hydrogen sulfide content in gasoline
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The sulfur content in this shift was normal; why is it above the limit in the subsequent shift? Given that the temperature and extraction volume remain constant, how should it be adjusted?
Has the properties of the raw material changed? Have there been any changes in the concentration on the delicate side?
It is essential to carefully check which process parameters have been adjusted before and after the shift change, and to pay close attention to any changes in temperature, pressure, and flow rate. If there are no changes in the process parameters, then the focus should shift to the properties of the raw materials
Could it be due to the laboratory? If not, then it’s possible that it’s an issue with the testing procedure. There is often a delay in obtaining test results; maybe it’s because of samples from the previous shift
No, is there a relationship between weather temperature and sulfur content?
Does the increase in temperature cause changes in sulfur content?
It can be considered from the following aspects: 1. Has there been any change in the raw materials used in the catalytic unit? The use of coker gasoline, kerosene, etc., in such units can lead to changes in the form of sulfur present in the raw materials； 2. Is the ethanolamine desulfurization system operating properly? Has there been any change in the temperature of the ethanolamine regeneration system, which could affect the efficiency of ethanolamine-based desulfurization? ； 3. Have there been any changes in the amount and purity of recycled hydrogen, resulting in changes in the recycled hydrogen desulfurization system?
Check the purity of the circulating hydrogen to see if the hydrogen concentration has decreased and if the hydrogen sulfide level has increased.
We have encountered this issue as well: the sulfur content of the samples taken after night shifts is on the high side; I suspect it’s a problem with the sampling process.