Catalyst and hydrogen sulfide
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Although there are many advanced purification technologies available today, which can reduce the hydrogen sulfide level to below 0.1 ppm and which involve the use of protective agents before the synthesis tower, the volume of fresh gas is quite large, resulting in a significant cumulative amount of hydrogen sulfide. Generally, after how much hydrogen sulfide is adsorbed per square centimeter of catalyst does its activity begin to decline gradually? And how much hydrogen sulfide can the catalyst in the insulation layer absorb at most? Is it to calculate the copper oxide content in the adiabatic layer, and then determine the hydrogen sulfide content required to form copper sulfide based on the chemical formula? Hope experts in this field can help answer?
For example, if the catalyst insulation layer contains five cubic meters of catalyst, the copper oxide content is estimated to be around 3.7 tons. Based on the chemical ratios, it can be calculated that to convert all of this copper into copper sulfide, 1000 cubic meters of hydrogen sulfide are required. Finally, based on the amount of fresh gas and the hydrogen sulfide concentration, an approximate estimate can be made of the total cost for the insulation layer; it would be around 100,000 to live in such an environment for three years. This is my understanding; I hope experts can provide an answer! ! ! !
Reply to 2# Shouhou: The amount of H2S absorbed by the catalyst can indeed be calculated in that way, so I basically agree with this view. Of course, the decrease in the catalyst’s activity is not solely due to H2S.
In a 600,000-ton plant, with a total sulfur level of 0.1 ppm (100 ppb) and an operating time of 8,000 hours per year, the catalyst is poisoned by approximately 5 m³ of sulfur over that period