What material should be chosen for the heat exchanger used to cool 30% pure sulfuric acid, reducing the temperature from 40 degrees to 10 degrees?
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As the title suggests, dear sea friends, do you have any good recommendations? Among 904L and Hastelloy C-276, which one can ensure that it does not react with sulfuric acid, thereby maintaining its purity?
It should be fine. Are there any additional operating conditions required? The fluorine side medium is 30% pure sulfuric acid, while the water side uses tap water. The pressure on both sides is roughly 10 atmospheres. The requirement is to lower the temperature of the pure sulfuric acid from 40 degrees to 10 degrees, while also maintaining its purity – it cannot react with the sulfuric acid to form impurities or anything similar. What type of heat exchanger should be used under these conditions? Thank you
Have you consulted with graphite manufacturers?
Graphite has very poor heat transfer properties, and it becomes brittle with long-term use! I would like to ask whether 904L will work; does anyone know its corrosion resistance mechanism?
Perhaps you are using low-quality graphite equipment. Our equipment is designed to have a service life of over 10 years under such operating conditions.
904L might work; it’s probably just a matter of lifespan. For greater safety, use Hastelloy 276. It will not affect the purity of sulfuric acid. An oxide protective film forms on the surface of the plate. It’s similar to the aluminum lunch boxes used at home in the past; they rely mainly on an oxide layer on the outside surface to provide protection against corrosion.
Does 904L not form a passivation film?
This post was last edited by yuchenchf on 2015-9-29 at 13:54. It is recommended to use C-276 with fluorinated gaskets; feel free to contact me if you need them
254SMO should work; analysis will be conducted based on temperature and purity
It’s better to go with 276; the temperature is low, and there are no issues at all.
Completely unreactive impurities? I think we shouldn’t consider metal after all. Whatever oxide film or passivation film is, it has to be formed after corrosion first.