Poor methanol
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What are the reasons for the excessive H2S levels in low-methanol content? How can the H2S content in methanol be reduced?
It mainly lies in the operation of the regeneration tower. Following the designed metrics should work.
The H2S content in lean methanol is high; the regeneration is incomplete – it is necessary to improve the control of the regeneration process
The issue with the regeneration tower: reduce the operating pressure slightly and increase the steam supply!
Excess hydrogen sulfide in lean methanol is basically a problem with the regeneration tower: high pressure and high temperature, along with an increased heat load, cause hydrogen sulfide to be trapped within the tower, resulting in an excess amount of methanol. The situation can be determined based on the temperature of the sensitive plate.