Hydrogen sulfide was detected in the zinc hydroxide production desulfurization reactor
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Both the hydrogen sulfide concentration in the raw material and that at the outlet of the adiabatic hydrogenation reactor are around 30 to 50 ppm. The zinc oxide desulfurization catalyst has been in use for about a year; logically, the hydrogen sulfide concentration should not reach saturation levels by now! Could there be any other reasons?
Perhaps the total sulfur in the feed was pulsed in, causing a sudden increase in sulfur penetration
It means it’s caused by a sudden increase in hydrogen sulfide in the raw materials; although it’s not particularly high, right?
What he meant was that the sulfur content in the raw materials is unstable; when it’s high, you fail to detect it
It’s been a year; there is a possibility that sulfur adsorption may have reached saturation
Take a sample of the zinc oxide desulfurization agent from the desulfurization tank, test its zinc sulfide content, and then decide whether it is necessary to replace the desulfurization agent.
No replacement is needed; if possible, increase the temperature of the hydrogenation reactor and try raising the temperature of the desulfurization reactor as well
It is essential to monitor the sulfur capacity of zinc oxide desulfurization agents; once it reaches the value recommended by the manufacturer (usually 30%), it should be replaced promptly. Otherwise, sulfur will penetrate, affecting the operation of the subsequent catalysts and causing poisoning.
It depends on the hydrogen sulfide content in your zinc oxide feedstock, after significant adsorption by the zinc oxide. The adsorption capacity will gradually decrease; it’s not possible to wait until it becomes completely saturated before replacing it
Adsorption is related to temperature as well as the content of gaseous water in the feed material.