Water content in methanol at the bottom of the low-temperature methanol wash heat regeneration tower
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Has the water content in the methanol at the bottom of the heat regeneration towers for low-temperature methanol washing in various plants been analyzed? About how much
Keep the moisture content in the regenerated methanol below 1%
The water content in the regenerated methanol is below 1%; the bottom liquid of the regeneration tower is where water is concentrated, with a significant amount of methanol vapor rising upward, so the water content in this bottom liquid should be fairly high
The regeneration tower is primarily used for the regeneration solution; H2S in the solution is distilled off. The methanol vapor, after cooling, is sent back to the regeneration tower. If the moisture content at the bottom of the regeneration tower is too high, it will affect the washing efficiency of the lean methanol solution. Therefore, the moisture content at the bottom of the regeneration tower should not be higher than 1%; it should be even lower if the operation is normal, with some plants achieving a level of 0.1%.
The methanol-water content at the inlet of the lean methanol pump in the regeneration tower is below 1%, whereas the methanol-water content at the bottom of the thermal regeneration tower is quite high; this methanol is intended to be fed into the methanol-water distillation tower for distillation
The relative moisture content of methanol at the bottom of the thermal regeneration tower is relatively high; therefore, a portion of it (5 M3/h) is drawn off and sent to the water separation tower for dehydration treatment. However, this represents only a small fraction of the total methanol circulation volume.
Analysis is performed every 8 hours. Initially, it was controlled at 1%, later at 2%; 2% is also acceptable
For low-methanol content, 4% water is also acceptable. What is the water content in the liquid that enters the water separation tower at the bottom of the thermal regeneration tower?
Previous analyses showed that the methanol-water content in the stream from the thermal regeneration tower to the methanol-water separation tower was around 5%, with values of up to 8% at times.
Does such a high water content have an impact on the removal of acidic gases? Won’t the sulfur content in the purified gas exceed the limit?
The analysis in the system shows values around 0.1–0.3, which is quite low; however, the purified gas still often fails to meet the standards