Can the material of the cylinder used to absorb the small amount of water in hydrogen chloride with concentrated sulfuric acid be Q345R?
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Concentrated sulfuric acid can be used to absorb the small amount of water present in hydrogen chloride. Can Q345R be used as the material for the tank? If possible, what is the corrosion margin, or rather, the corrosion rate? Are there any experts in this field? . .
No, concentrated sulfuric acid is no problem. Hydrochloric acid is corrosive
The most ordinary carbon steel can be used; we’ve been using it for N years with no problems. Just make sure to replace the diluted sulfuric acid in a timely manner
Yes, Q345R is a low-alloy steel; it corresponds to the former 16MnR material. 1. For concentrated sulfuric acid, carbon steel is generally sufficient, and Q345R works fine as well. However, the concentration of the sulfuric acid should not be lower than 92%, with 98% being ideal. 2. There is no problem with hydrogen chloride gas either, as the moisture in it is quickly absorbed by concentrated sulfuric acid. It simply doesn’t absorb anything; the presence of CL- has little impact. When I was working at a design institute, I used Q345R to store solutions containing CL-, and it’s possible to store them for 10 years at room temperature.
It shouldn’t be possible; as the concentration decreases, the degree of corrosion increases, so Q235B cannot be used