I would like to ask about preservation measures for organic acids!
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In my waste gas treatment project, the waste gas within the pipes contains organic acids such as acetic acid； The main components are as follows: Sequence Component Composition wt% Emission rate kg/h Volume percentage 1 Acetic acid 0.05 0.0234 2 Acrylic acid 0.04 0.0156 3 Maleic anhydride 0.02 0.0043 4 H2O 5.67 8.79 The rest is nitrogen and oxygen. What material should be used for the pipes? How can I apply anti-corrosion treatment to Q235-B? What is the relationship between the corrosion behavior of organic acids and their physical form? What is the relationship between the corrosivity of organic acids and temperature?
I’m not sure what kind of anti-corrosion measure the original poster is referring to – is it for pipes or equipment? For equipment, a larger margin against corrosion can be allowed, so the requirements for anti-corrosion measures become simpler. Also, I wonder whether the organic acids mentioned are in gaseous or liquid form; if they are gaseous, even fewer considerations are needed. This is just my personal opinion
I’m not sure what the temperature conditions in the owner’s environment are; if the temperature is low, below 100 degrees, fiberglass material can be used.
Thank you for your advice. What we are wondering about is that the exhaust gas contains organic acids! Is it reliable to use Q235-B for the pipes, as well as for the valves and equipment that come into contact with this exhaust gas? The temperature of the exhaust gas is below 100 degrees. Is there any practical experience in using glass-coated steel in such applications? What is the cost of coating per square meter?
Carbon steel may not be able to be used for a long time in such an environment, and fiberglass reinforcement also presents certain risks in terms of corrosion resistance. Please consider carefully.
I hope the teachers from the chemical plant can give me a lot of guidance!
Has anyone used carbon steel with a urea coating? What are the temperature requirements? What is the actual performance in practice? Please advise those with experience!
Rotomolding or lining with PTFE sheets can be considered. For rotomolding, cheaper PO materials can be used, but PTFE offers the best performance in terms of corrosion resistance and heat resistance. 1# qn_cmd
There are no successful cases worldwide demonstrating the corrosion resistance of polyurea in complex corrosive environments; it is less reliable than using scaled mortar or fiberglass-reinforced plastic. 7# qn_cmd
Based on your criteria, if the temperature is below 180°C, fiberglass could be considered as a suitable material; using a carbon steel lining would meet the requirements for on-site use, but it would make future maintenance more difficult. It is recommended to use fiberglass-reinforced plastic; as for the specific type of fiberglass-reinforced plastic to use, you can consult fiberglass-reinforced plastic manufacturers.