Acidic Stainless Steel Application

Corrosion concerns are paramount. Check the Cole-Parmer materials compatibility database for suitable materials for the other liquids.

Consider also the inherent safety of the process. If it doesn't matter whether phosphoric, hydrochloric or sulphuric acids are used, then why use acid at all <rhetorical question>?

It sounds as though a Chemical Engineer's input is needed on this one.

Further thoughts:

If the acid is to be ingested then there are personal safety implications to be considered. Phosphoric acid is found in principle brands of cola drink, for example, and hydrochloric in the stomach naturally. Sulphuric really doesn't need to be brought near biological systems in any significant concentration......

Your questions are quite complex. I mean you've different scenarios with different acids at different concentrations and they shall be carefully evaluated.

Just a consideration:

if you want to use phosphoric acid -

http://www.stainless-steel-world.net/pdf/10015.pdf

Hope this helps you

Vittorio

corrosion & rust control

Follow the links provided by PWSlack and strider. Remember, chloride (as in HCl) is always a no-no with stainless steel!

I have 3 4 things to say:

1. Do you know what the "P" in HEPA stands for? If you do, explain.

2. You should not be asking for answers, you should be asking for current recognized reference material that you can procure and keep on your book shelf at the office.

3. Although overused here, the fishing analogy is appropriate.

4. This sounds like homework, but........................

Am I the only one who is curious about, "HEPA filter vented 316 SS tanks"?

High Efficiency Particulate Absorbing(Arresting) Filter. It is used to keep contaminates out of the tank as the tank is emptied.

Our young engineer Jason should also check to see that the filter media is compatible with the acids as any vapors will affect the filter. Nothing worse than having it disintegrate and contaminate the process! Kind of useless at that point.

As long as he doesn't think that the filter is filtering/controlling vapors. Surely the filter media is compatible.?

Stainless Steel IS NOT COMPATIBLE with HCl!!! As a young engineer you should check your compatibility charts as one of your first steps. As an old one you should also do it.

Also review the existing system to make sure it was designed correctly initially. There could be some very big goofs made by the original designer which you no doubt will be blamed for if there are any problems with you final system. This would be especially true if it was your present boss who designed the original system.

Smart engineers always remember Murphy's Law and that Murphy was an optomist!

Hi Guest,

Try certain organic acids like citric or sulfamic. I don't know the slurry you have but check if you can substitute phosphoric with those organics? Wish you good luck, Gil.

I don't know if I would trust someone wanting to use Sulfuric acid, Hydrochloric acid in a meat slurry recipes. Since its most likely going to food product like chicken nugget. And Wikipedia Meat Slurry.

It just don't sound like good eats to me.

Just my 2 cents.

Charles

Hi,

Don't be surprised! Processed food is contains many un-wished chemicals like sulphuric and phosphoric acids. Look the label of Coka Cola, phosphoric acid is the main product with another chemicals. Between the dead and the transpormation of the animal to eatable form, takes time, and it can be days. These acids kill all bacterias, decomposition products as virus, and other fonguses. The slurry is the way they eliminate what is directly dangereous to us. Also, meat changes it's colour, and becomes photogenic. It looks nice this steak! At place of pale chicken nuggets you get pinkish. Good appetite from Gil.