×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Triflic Acid

Triflic Acid

Triflic Acid

(OP)
I need to apologize up front but I cannot get the search function to work on this site.  I just get a blank screen.

I am looking for suitable materials for pumping triflic acid.  I cannot find this acid in any chemical compatibility charts.  Specifically, I want to know if EPDM is an acceptable elastomer.  

 

RE: Triflic Acid

This is a tough chemical to find compatibility information.
According to a Goggle search this a a "super" acid.
I can not tell you for certain what is a compatible elastomer.
But when I  scan a Parker O-ring catalogue, EPDM has a low compatibility rating with most "acids".
I would be very cautious using EPDM.

For a good guess, Kal-Rez should work.
TFE or PTFE is certainly chemically compatible but some applications find the teflon "cold flow" objectionable.

RE: Triflic Acid

Have you checked with the supplier?  They can usually provide very good data on what works for their chemicals.

RE: Triflic Acid

(OP)
Thanks for the responses.  I did check with the supplier and they recommended Hastelloy C.  This holds up but not very long.

I will take Yitbos advice and try kal-rez with an all Teflon AODP.

Thank you both for your advice.

RE: Triflic Acid

Not a bad choice.  We handle many corrosive chemicals at our manufacturing site and use HastC for lots of process equipment.  This alloy holds up very well as long as we keep running.  We see most of our problems when we shut things down for either a process change or maintenance and the equipment "breathes".

We have used Triflic Acid in small quantities as a catalyst in some of our processes.  It is delivered to us in stainless steel kegs from the supplier and we repack it down to 1/2gal glass bottles.

I am interested to know if the Kalrez and Teflon hold up under pumping and/or tranfer conditions as we have considered some dosing operations in the past and were concerned about materials of construction.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources