The sulfur recovery off-gases are sent for treatment in a low-temperature methanol wash
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The acidic gas from low-temperature methanol washing enters the sulfur recovery unit where it undergoes the Claus reaction to produce sulfur. The unreacted acidic gas is cooled in a quench water tower after hydrogenation, and then absorbed by MDEA. Can this unabsorbed gas enter the low-temperature methanol wash H2S concentration tower? Does anyone know which company operates in this way? How effective is it?
What is the volume of the exhaust gas after CO2 and H2S are absorbed by MDEA? What are the ingredients? What is the amount of each?
For the hydrogen sulfide recovery tower, a cryocooler is also needed to lower the gas temperature before it can enter the tower
I also considered this issue some time ago; in theory it is feasible, but there are two problems: organic sulfur may accumulate, as sulfur recovery processes do not completely remove organic sulfur； Additionally, the issue of water in the exhaust gases needs to be resolved to prevent an increase in the methanol content in the wash water~No data on operational performance available~~
Yes, by sending hydrogen sulfide to the corresponding tray
Theoretically feasible, but it involves issues such as pressure level matching and water presence
Theoretically, the exhaust gas after hydrogenation by Claus can be sent to the concentration tower of the low-temperature methanol wash process, but this is not very practical for operation; since the exhaust gas contains a certain amount of oxygen, it causes the hydrogen sulfide in the system to be oxidized into elemental sulfur, which tends to accumulate. This type of design was common in previous designs; now many factories have already upgraded it.