Material selection for hot sulfuric acid
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For heat exchange equipment used with sulfuric acid at around 120 degrees Celsius and at a concentration of about 70%, what material is suitable?； Currently, it is quite difficult to repair leaks in the glass equipment in the workshop
High-silicon stainless steels, high-alloy stainless steels, nickel-molybdenum-chromium alloys (and Hastelloy) can resist both dilute and concentrated sulfuric acid, as well as sulfuric acid of any concentration at high temperatures and high speeds. Among them, high-silicon stainless steel is the cheapest, but it has poor seismic resistance, is difficult to process, and cannot withstand sulfuric acid solutions containing fluorine or sulfite impurities (in such cases, grade 20 high-alloy steel can be used). High-silicon stainless steel is the most widely used alloy material in the sulfuric acid industry; it is employed to manufacture various equipment used in sulfuric acid production, such as dryers, absorbers, tubular acid separators, tank-tube acid separators, packing support grids inside towers, circulating acid tanks, shell-and-tube acid coolers, pipelines, pumps, flanges, and valves. However, high-silicon stainless steel is not widely used for manufacturing sulfuric acid storage tanks. Found it online; hoping for advice from fellow users who have experience with similar designs~
As far as I know, there are heat exchangers made of PTFE, those coated with enamel, tubular heat exchangers made of silicon carbide, and those coated with PFA. I’m not sure what specific information the original poster is looking for; if there are any questions, feel free to communicate via the message box
As far as I know, there are heat exchangers made of PTFE, those coated with enamel, tubular heat exchangers made of silicon carbide, and those coated with PFA. I’m not sure what specific information the original poster is looking for; if there are any questions, feel free to communicate via the message box
Hastelloy B3 is the preferred choice. Hastelloy has a face-centered cubic structure, offering excellent corrosion resistance, particularly against hydrogen chloride, chlorine, hypochlorous acid, and sulfuric acid. Hastelloy is a series of materials, among which B3 is the most suitable for resisting sulfuric acid corrosion, with an annual corrosion rate of less than 0.1 mm in environments around 100°C.
I think what was said on the fifth floor makes sense!
Graphite heat exchangers are recommended; they exhibit no corrosion when used for extended periods in 75% sulfuric acid at its boiling point.
Tetrafluorine spraying; F40 is sufficient
The poster can learn more about it; I hope you can find one that satisfies you!
This operating condition involves high-temperature dilute sulfuric acid at around 70%, and virtually no materials can be used in such conditions. Under anaerobic conditions, Hastelloy B3 can be used, but if a large amount of oxygen is present, the corrosion rate will be very high. Use tantalum for insurance. Actually, I think in most cases, steel-lined glass or enamel would be used. If the cost of lost work is not high