Looking for advice of potential CRA's for multi-acid fluid
Looking for advice of potential CRA's for multi-acid fluid
(OP)
Hi all, for a new to build project we are designing, we are looking for advice on potential corrosion resistant metallic alloys that can withstand the corrosive media. The project has an R&D charachter with new technology, however there's a limited budget available. Unlike commercial plants the material selection has great impact on overall plant cost and return value, as the units are typically used for short periods of time. Hence material selection is of great importance.
Right now it all seems to become quite (if not too?) expensive since we cant find a suitable metallic alloy that has a balance of reasonable price and availability vs corrosion resistance and process conditions. Potential candidates have been glass lining, tantalum and zirkonium, however they are either too expensive, or put limits on equipment design which stops the process from working. Hastelloy alloys would be a good alternative however, but not sure if theyd work.
The fluid present are;
Any ideas would be greatly appreciated!
Right now it all seems to become quite (if not too?) expensive since we cant find a suitable metallic alloy that has a balance of reasonable price and availability vs corrosion resistance and process conditions. Potential candidates have been glass lining, tantalum and zirkonium, however they are either too expensive, or put limits on equipment design which stops the process from working. Hastelloy alloys would be a good alternative however, but not sure if theyd work.
The fluid present are;
- Polyols
- Ethylene oxide (max ~10wt%)
- Propylene oxide (max ~10wt%)
- Potassium hydroxide (max ~2.0 wt%)
- Disodium pyrophosphate (dissolved in water)
- Sucrose (dissolved in water)
- Glycerine
- Water
- Natural oil epoxides
- Acetic acid w/ H202 (or peracetic acid /w H20)
- Hydrogen peroxide (H2O2)
- Sulphuric acid. In reaction H2SO2 giving Caro's acid (Pyranha)
- Filter aid (e.g. perlite) powder also occasionally present
Any ideas would be greatly appreciated!





RE: Looking for advice of potential CRA's for multi-acid fluid
What concentrations and temps would those 'brief' exposures be?
What alloys have you ruled out?
I would start looking at Alloy 20 and AL-6XN, good corrosion curves are available for both alloys.
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P.E. Metallurgy, Plymouth Tube
RE: Looking for advice of potential CRA's for multi-acid fluid
Pyranha is also considered to be problematic. The products make up a very strong oxidising environment. Currently tests are done with several inconels and titanium. Ruled out are 316 and duplex. Glass lining seems to be a potential issue due to temperature and ph. I'll post concentrations tomorrow when I have data at hand.
RE: Looking for advice of potential CRA's for multi-acid fluid
Temperatures around 100-120 °C.
RE: Looking for advice of potential CRA's for multi-acid fluid
Alloy C22 or 59.
RE: Looking for advice of potential CRA's for multi-acid fluid
RE: Looking for advice of potential CRA's for multi-acid fluid
RE: Looking for advice of potential CRA's for multi-acid fluid
RE: Looking for advice of potential CRA's for multi-acid fluid