"Corrosion resistant material to recover salt brine"

Question:

"We need to recover & reconcentrate brine in a food processing application. The sodium-chloride brine (approx. 140-degrees w/o heating) is in a range of 2-3% by weight and we want to concentrate back to 11-12%. We're considering a steam-heated tank to boil off excess water. There is a trace of sodium acid pyrophosphate and small amounts of dextrose in the water. What would be appropriate material to fabricate the tank and associated piping? We hope to find a material that's readily available to fabricate in a matter of days."

Answer:

It is our policy not to specify materials for corrosive processes, based on the limited information available in discussion forum formats. Appropriate materials recommendations need to include other information, such as design details, operating and process details not available. However, based on your description of the process you should consider alloys that resist pitting and chloride stress corrosion cracking, ones high in chromium and molybdenum. Alloys C-22, C-276 and their variants are possible candidates. I also recommend corrosion testing potential candidates before making your selection.

 

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