Low-temperature methanol washing with alkaline solution
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After adding alkali solution to the low-temperature methanol washing dehydration tower, blockages occurred in the instrument tubes at the top of the regeneration tower as well as in various heat exchangers
Too much has been added, isn’t there an issue with the alkali used? Has it been analyzed? What is the form of the gas?
After adding alkali, the sulfur content in the methanol-poor mixture increases
The factor that controls pH; an excess amount can lead to the formation of thiourea
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It’s not necessarily caustic soda that’s causing the blockage; it could be ammonia crystals.
The amount of alkali added should be small; it’s probably the ammonia salt crystals that are causing the blockage