Total sulfur in liquefied gas
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The total sulfur content after hydrogen sulfide removal is 404, while it is 188 after desulfurization. How much sulfur can generally be removed from liquefied gas after desulfurization?
It depends on your requirements. If the standards are high, the value should be below 20; according to civil liquefied gas standards, it should be below 343, and we can keep it below 50
Reply to 2# lijianhuai: It is extremely difficult to reduce the total sulfur content in coking liquefied gas to below 50 ppm. What is the sulfur content of the coking feedstock? What further desulfurization techniques are used after wet desulfurization of coking liquefied gas?
It’s very simple; we use the desulfurization and denaturation technology for refined liquefied gas from Hebei. Before desulfurization, the value is above 100,000, while after desulfurization it is below 50. Some facilities aim to keep this value below 25, and that’s normal
Reply to 4# lijianhuai: Generally, coking liquefied gas contains disulfides, methyl mercaptan, and carbonyl sulfide, which are difficult to remove through amine washing or alkali washing; it seems that the amount of sulfur in this form in your liquefied gas is relatively low； We control the levels of thiol sulfur and hydrogen sulfide in our coker liquefied gas to less than 10 ppm, while the total sulfur content can sometimes exceed 100 ppm
Ours is also relatively high; initially the requirement was 200, but it was later changed to 300. However, under normal operating conditions with no major issues, the properties of the raw materials play a significant role, so our overall sulfur content is around 100 ppm.
More than 100,000 before removal? Whether it’s before hydrogen sulfide removal or before thiol removal, this is indeed a bit high. Does the sophisticated technology from Hebei that you use include hydrogen sulfide? Could you talk about the features of this technology? I’d like to learn about it. Thank you
What is the typical amount of cobalt sulfophthalocyanine to be added for the desulfurization of liquefied gas? Our plant was able to keep this amount below 100, but in recent days it has suddenly risen above 100. Replacing the catalyst’s alkaline solution did not have a significant effect, and now the color of the catalyst’s alkaline solution is somewhat yellowish instead of green as before. I would like to ask if this is due to an insufficient amount of catalyst being added; we usually add one pack of cobalt sulfophthalocyanine whenever we replace the alkaline solution. I would also appreciate it if everyone could share their insights and discuss this.
Sulfur exists in liquefied gas in various forms; by using fiber membrane technology, the total sulfur content can be reduced to below 20
Depending on the process adopted by the design institute, the amount of sulfonated cobalt phthalocyanine ranges from 100 to 400 PPm
Using fiber membranes, a desulfurization rate of over 95%