Reasons for high total sulfur content after LPG desulfurization
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Why is the total sulfur content in the C4 fraction obtained from gas separation higher than that in the feed gas after desulfurization using titanium ylide cobalt phthalocyanine for LPG?
Because organic sulfur is concentrated in the heavy components
Yes, because the heavy components have been enriched. All sulfur-containing substances are in the heavy C5 and C4 components
The refined liquefied petroleum gas is fractionated by a depropanizer into C3 and C4 fractions, with the C4 fraction accounting for less than 1/3 of the incoming feedstock quantity. Moreover, most of the sulfides in the feedstock are contained in the heavy components; naturally, this results in the sulfur content of the C4 fraction being higher than that of the feedstock. Is this understandable?
After regeneration, the disulfides entrained in the caustic solution were not completely settled and separated. Subsequently, during the sweetening process, these disulfides migrated from the caustic solution into the liquefied petroleum gas, resulting in an excessive total sulfur content.