Material Selection for Tank holding 40 weight% NaOH at 250 degrees

[drsymes]

Hello,

I am currently having trouble finding information on material selection for a tank, which will hold caustic NaOH solution (40 weight%) at 250 degrees celsuis.
Can anyone help me with ideas or locations of where information can be obtained?

Many thanks

DSymes

 

[EdStainless]

http://www.outokumpu.com/applications/documents/start.asp

You might want to check this as a source. I am not sure that the data will go hot enough.
How high of a pressure is this? This isn't a tank, it is a pressure vessel.
At this temp you are into fairly exotic materials.

I could talk to you about heat exchanger alloys, but the vessel will be another issue.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[drsymes]

The pressure will be approx 42 atm.
My idea was to have a holding tank of NaOH 40 weight% solution and pump it through a heat exchanger to a vessel where the solution would leach a ceramic core out of a single crystal alloy.
Another method could use an autoclave to achieve this, but what I am not sure about is the materials I could use for vessel and pipes that will be non-corrosive to NaOH at these temperatures and pressures?

DSymes

 

[strider6]

Have a look at this document from NIDI. It seems that one candidate materials for you could be the Alloy 625. At page 6 is reported that it can withstand caustic up to 320°C.


Alloy Selection for Caustic Soda Service

http://www.corrosionsource.com/technicallibrary/nidi/literature/pdf/10019.pdf

or also at this @ pag 28

http://www.specialmetals.com/documents/SM Aqueous Corrosion Book.pdf

hope this help u

S

Corrosion Prevention & Corrosion Control

 

[ApC2Kp]

DSymes,

You are probably up into temperatures where nickel (pure nickel - Ni 100) is the only workable material.

The temperature exceeds the capability of plastics like Teflon for a lining of a steel vessel. Nickel lining on steel might be considered? How large is reactor vessel?

 

[drsymes]

at this stage the reactor vessel is about 80 cubic meters.
Thank you for your time

DSymes

 

[EdStainless]

For heat exchanger tubing, the super-ferritic stainless E-Brite might be a good bet. But you can't use it for structure.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube