Organic amine desulfurization status

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We only know that the amine-based method used by our company to treat catalytic flue gas has failed; the material used is 316L, and corrosion is severe, with no new solution available to date.

This is what I researched before: an analysis was conducted on the environmental corrosion caused by RNH2 (ethanolamine)–CO2–H2S–H2O, which is a common issue in desulfurization units. 1. Corrosion sites: The corrosion caused by RNH2-CO2-H2S-H2O mainly occurs in the lean/rich liquid pipelines within the amine system of desulfurization units, the pipelines from the regeneration tower to the regeneration tower reboiler, the regeneration tower reboiler and the lines leading back to the tower, as well as the heat exchangers and pipelines for lean/rich liquids; corrosion is more severe in areas with higher temperatures. 2. Corrosion mechanism: Since H2S and CO2 in the amine solution of the regeneration tower cannot be completely removed, the amine solution becomes alkaline in the presence of water, leading to corrosion of the type RNH2-CO2-H2S-H2O. This corrosion intensifies as the CO2 content in the amine solution increases; both free and combined forms of CO2 can cause corrosion, which occurs as a result of the combined effect of CO2 and amine under alkaline conditions. The reactions that occur during the corrosion of RNH2-CO2-H2S-H2O mainly stem from: 1) free CO2: Fe + 2CO2 + 2H2O → Fe(HCO3)2 + H2; Fe(HCO3)2 → FeCO3↓ + CO2 + H2. 2) combined CO2: CO2 + H2O → H2CO3; Fe + H2CO3 → FeCO3↓ + H2. The Fe(HCO3)2 and FeCO3 formed as a result of these reactions are loose corrosion products, and the action of flowing fluids causes these reactions to proceed repeatedly, leading to pipeline corrosion. 3. Protective measures 1) The MDEA solution itself is not highly corrosive, but its degradation products (especially those resulting from oxidation) are often highly corrosive. At the same time, impurities such as corrosion products entrained in the solution also have a strong corrosive effect; therefore, various types of filters should be installed in the pipes to remove these impurities. 2) The selection of pipeline materials should be appropriate. Steel grade 20# has poor corrosion resistance in an RNH2-CO2-H2S-H2O corrosive environment; it is recommended to use stainless steel for the inlet and outlet pipelines of the reboiler in regenerator towers where corrosion is severe. 4. Given the special corrosiveness of the rich liquid (which mainly contains acidic gases such as H2O and CO2), to ensure long-term operation of the equipment, it is recommended to replace 20# steel with 304 stainless steel or 316L. Corrosion in methyl diethanolamine-based mixed media is severe; bubble erosion corrosion often occurs on a serious scale. 316L is not the best material choice either – the best options are 317L or duplex stainless steels such as SAF2205.

It seems the question is about flue gas desulfurization, which removes sulfur dioxide.

This is flue gas desulfurization, the removal of sulfur dioxide

Is organic amine desulfurization the same as ionic liquid desulfurization? ? It seems that Sichuan West China was the first in China to do this, but there are also many technical issues, mainly blockages

The operation of ionic liquids at West China Hospital in Chengdu has been very successful. Please contact me if you need consultation.

It won’t get clogged; the problem was solved as early as 5 years ago

You’re using cansolv, right? That’s the result. If you need it fixed, we can help you.