Yellow Prussiate of Soda (YPS) 2

[rnip]

This was posted in Mechanical engineering other topics, but I think this will be a better place for it.

The problem that I have find a tank that will be able to store Yellow Prussiate of Soda (YPS), but I do not know what type of material will be able to handle it. The tank that held the YPS was steel and it rusted out. I was thinking of polyethylene, it seems to work for like concentrations (10ppm). However, the concentration of the YPS I am during with is around 80-100ppm.

I was hoping that maybe someone has some experience with YPS. Any suggestions would be appreciated.

Thank you in advance.

rnip

 

[cub3bead]

It is ok to say sodium ferrocyanide instead of YPS in this forum. You could even had said C6FeN6Na4 + 12 H2O and we would have understood. YAS and we have to look it up.

For suitable plastics look at:

http://www.mkplastics.com/other/Corrosion Resistance Tables-FRP-90-09-0505.pdf

Looks like tantalum is the only suitable metallic substance

http://www.astrocosmos.com/pdf/chart.pdf

 

[rnip]

Thank you very much, ya, I forgot I was talking to chemical engineers, . That is an awesome table. Thank You again.

rnip

 

[kenvlach]

Re "Looks like tantalum is the only suitable metallic substance."
Of course, if only one metal is tested -- by a tantalum vendor!
Aluminum is considerably less expensive. Also, for your dilute concentration, 316 will be excellent (rather that merely 'Good' as in listing below); it is used for Alodine & Iridite chromating solutions which contain a lot of nasty stuff besides Sodium Ferrocyanide!

Chemical Compatability Results for Sodium Ferrocyanide
Material Compatibility
304 stainless steel B-Good
316 stainless steel B-Good
ABS plastic N/A
Acetal (Delrinr) A-Excellent
Aluminum A-Excellent
Brass N/A
Bronze N/A
Buna N (Nitrile) A-Excellent
Carbon graphite A-Excellent
Carbon Steel N/A
Carpenter 20 N/A
Cast iron N/A
Ceramic Al203 A-Excellent
Ceramic magnet N/A
ChemRaz (FFKM) A-Excellent
Copper D-Severe Effect
CPVC A-Excellent
EPDM A-Excellent
Epoxy A-Excellent
Fluorocarbon (FKM) A-Excellent
Hastelloy-Cr A-Excellent
Hypalonr B-Good
Hytrelr N/A
Kalrez A-Excellent
Kel-Fr N/A
LDPE A-Excellent
Natural rubber B-Good
Neoprene A-Excellent
NORYLr A-Excellent
Nylon N/A
Polycarbonate N/A
Polyetherether Ketone (PEEK) A-Excellent
Polypropylene A-Excellent
Polyurethane B-Good
PPS (Rytonr) N/A
PTFE (Teflonr) A-Excellent
PVC A-Excellent
PVDF (Kynarr) A-Excellent
Silicone N/A
Titanium N/A
Tygonr A-Excellent
Vitonr A-Excellent

Ratings -- Chemical Effect
A = Excellent.
B = Good -- Minor Effect, slight corrosion
or discoloration.
C = Fair -- Moderate Effect, not recommended
for continuous use. Softening, loss of strength,
swelling may occur.
D = Severe Effect, not recommended for ANY use.
N/A = Information Not Available.

For chemical compatabilities, I like Cole-Parmer's site:

http://www.coleparmer.com/techinfo/chemcomp.asp

Just scroll to select the chemical & click submit.
Ken

 

[cub3bead]

Why is C20 n/a when 304/316 is B rated and Hast C A rated?

 

[kenvlach]

Cole-Parmer didn't find reliable test results for C20.
Perhaps you can go to the expense of testing, and then report your results.

One chemical consideration is that C20 (presume you mean UNS N08020) contains 3-4% Cu for which ferrocyanide ion may act as a chelating agent, thereby selectively leaching from the alloy.

 

[EdStainless]

And here I am without my Compas Corrosion Guide.
I would guess that Ken is right about the chelating effects of this chemical. If I needed an alloy solution I would look for high Cr content.
A non-metalic solution looks best for this application. Just make sure that the polymer is stable in this environment. If you start leaching it may fail faster than the wrong alloy.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm