What is the fate of the gas phase from the methanol-water separation tube before the methanol-water separation tower?
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As indicated in the title, the gaseous phase that is generated through flash evaporation after spraying methanol solution in the pre-spray methanol-water separator of the Lindemann process methanol-water separation tower is designed to have two discharge paths； A flow is sent to the flare for venting. A stream enters the methanol-water separation tower; forum members discuss where this gaseous stream goes in their own plants, and talk about the advantages and disadvantages of its various destinations
No image! When going to the torch, it’s definitely burned, which is a waste; under normal circumstances this wouldn’t be done. This line is probably used only when production stops or when venting is necessary. What enters the water separation tower is recovered; isn’t recycling under normal conditions a good thing?
We can enter the thermal regeneration tower, go to the underground tank, and connect with the shell side of the coiled heat exchanger. Used when the methanol-water separation tower is disconnected. Not used yet
As you said, that’s where the vapor phase resulting from flashing before the methanol/water separation tower in Dalian University of Technology’s process and Linde’s process goes. Sending this vapor to the flare can reduce the corrosion caused by acidic gases such as H2S and CO2 in this vapor on the methanol-water separation tower and its internal components (especially carbon steel equipment). However, since this vapor is burned directly in the flare and then released, hydrogen sulfide burns to form SO2, which is then emitted into the environment, thus causing certain pollution. In the methanol-water separation tower, acidic gases such as H2S and CO2 present in this vapor cause corrosion to the tower and its internal components, especially carbon steel equipment. However, this vapor, along with the evaporated methanol vapor, enters the heat regeneration tower, where the acidic gases are desulfurized. Through this sulfur recovery process, SO2 emissions are reduced, which is certainly beneficial for environmental protection.
This acidic gas is directly sent back to the stripping tower for concentration, and then proceeds to the thermal regeneration tower where sulfur is removed to produce concentrated sulfuric acid
This concentration pipeline is the same as that of v02; both are used to enrich hydrogen sulfide, providing raw material for the production of concentrated sulfuric acid
Ours is going to the hydrogen sulfide concentration tower
The liquid phase goes to the methanol-water separation tower, while the gas phase goes to the lower section of the concentration tower.