What materials are resistant to formic acid corrosion?
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This post was last edited by zengzhiyongyes on 2011-11-7 09:34. It is a set of exhaust gas adsorption and purification system, dealing with exhaust gases that contain small amounts of formic acid and methyl formate. Because it uses steam desorption, the operating temperature during desorption is around 100°. Using 304 stainless steel for the adsorption tower led to it being corroded through very quickly. Later, it was lined with enamel, and some joints were also severely corroded. In this case, what material should be used for the adsorption tower?
You might try using polymer materials for surface protection.
According to the corrosion data and material selection manual, Hastelloy C is suitable.
The cost is way too high. Are there any more conventional materials? For environmental projects like this, the company doesn’t invest that much. . .
In such an environmental medium, high-polymer composite materials resistant to severe chemical corrosion can be used to address the issue. In the past, when repairing similar enamel-lined reaction vessels, we basically used the EE-121K protective material, which is capable of withstanding high temperatures and severe chemical corrosion when exposed to immersion conditions.
This post was last edited and replied to by Wang Genrong on 2015-1-29 at 09:21. Reply 2# yingbin: It is possible to choose a PTFE-lined board
Thank you all for your answers. We are now using ceramic lining. However, many of the joints are not perfect, and corrosion occurs at those joints. It’s just difficult in this regard.
I was wondering, have you tried using PTFE?
This post was last edited by Wang Genrong on 2015-1-29 09:23. A impermeable graphite tower can be used. Impermeable graphite exhibits extremely excellent corrosion resistance in formic acid media, and it is also relatively inexpensive. Impervious graphite can be used to manufacture condensers, coolers, heaters, reactors, column-type equipment, as well as various custom-made devices. It can be used for extended periods at the boiling point of formic acid at any concentration without experiencing corrosion.
Do you know where I can do it? Do you have a contact method? Please give one