Methanol is slightly acidic; how should carbon steel storage tanks be handled?
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Dear colleagues: The methanol recovered from our company’s distillation units has a slightly acidic nature. The storage tanks are made of carbon steel, and rust can cause the methanol to turn red, affecting the quality of the products downstream. Is there any effective way to deal with these carbon steel tanks? It’s better if it has a low cost, thank you!
The storage tank is filled with nitrogen, the pressure in the four distillation columns is reduced, or light components are removed thoroughly in the pre-distillation column.
The inside of the tank is treated with high-quality epoxy resin paint. If cost is a concern, you can ask Lützhöhl; they have filters designed for this purpose
In the short term, it involves adjusting the manufacturing process; in the long term, it is about implementing anti-corrosion measures； Which one is suitable depends on cost considerations, and you have to figure it out on your own; what works for others may not necessarily be applicable to you