Materials selection for pressure vessels resistant to chloride corrosion
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During wastewater treatment, the wastewater contains high levels of chloride ions, ranging from 10,000 to 50,000 ppm; the pH value of the wastewater can be adjusted to between 7 and 9. The reaction conditions are: 200–300 degrees, with a pressure of 3–9 MPa. Choosing materials for pressure vessels is a challenging task; relevant data is hard to find. I would like to ask everyone what materials would be suitable? Impermeable graphite is said to be highly resistant to chloride ion corrosion; I wonder what pressure such containers can withstand?
For around 10,000, you can choose duplex steel; for higher amounts, titanium alloy can be considered
Nickel-based alloys can withstand higher temperatures and are resistant to chloride stress corrosion
Titanium alloy can be chosen; the temperature and pressure are relatively high.
The temperature of duplex steel must not exceed 250 degrees
The best alloy resistant to chloride corrosion is tantalum alloy.
It’s not possible to achieve such high pressures; pressure vessels made of impermeable graphite cannot meet your requirements
Your operating conditions are quite similar to those of the wet oxidation process we use currently; basically, TA10 is what is used in the market.