About 30% H2SO4, about 5% nitric acid, about 1% hydrochloric acid; can a PP-lined or PO-lined steel vessel be used at temperatures below 80°C?
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About 30% H2SO4, about 5% nitric acid, about 1% hydrochloric acid; can a PP-lined or PO-lined steel vessel be used at temperatures below 80°C?
Theoretically, in conditions with about 30% sulfuric acid, about 5% nitric acid, and about 1% hydrochloric acid, at temperatures below 80°C, steel-lined PP and steel-lined PO materials can generally be used. However, in practical applications, other factors must also be taken into account, such as the impact of impurities in the medium, fluid flow rate, pressure, and other factors on the materials.
It is important to know whether these three acids are all present in the same system, exist separately, or are combined with each other. The properties of pure acids and mixed acids, especially at higher temperatures, require careful consideration of the materials as well as the conditions and limits of tolerance.
If the operating temperature is between 70 and 80°C, it is better to use PTFE; this is the recommendation