Jump to content

  2. →
  3. →


Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

Recover Nh3 From Wastewater

Started by Guest_ch-potato_*, May 16 2004 05:01 AM

This topic has been archived. This means that you cannot reply to this topic.
4 replies to this topic
Share this topic:
| More

#1 Guest_ch-potato_*

Guest_ch-potato_*
  • guestGuests

Posted 16 May 2004 - 05:01 AM

these days i work on a project that recovering NH3 and methanol from a wastewater.The main components in it is NH4CL,methanol,benzene,H2O and some heavy impurity.we put some alkali in it so that some NH4+ can change in dissociate NH3 .Then a steam get in the bottom of the tower which is 130 ¡æ,3 bar.what i want to know is that is it possible that fraction of the NH3 and NH4+ in the bottom can below 5ppm.
i think since the ion of CL- exists in the aqueous solution so you can never make it possible to below 5ppm,even you put more alkali in it or give more heat in it(such as using distillating tower).
at last the NH4+ will turn to the solid(NH4CL) with the water decreasing.
all the salt solution are the same like the NH4CL .
is the idea true? can somebody so kind that give me a explanation or advise some website.
anything i didn't say clearly ,don't hesitate to write back to me . blink.gif

#2 siretb

siretb

    ChE Jedi

  • ChE Plus Subscriber
  • 304 posts

Posted 19 May 2004 - 07:40 AM

I do not see a reason why at a high enough pH (>10) you could not steam strip the ammonia. Chlorides would end up as sodium chloride if you use caustic.
Steam striping works for ammonia in industry, and is used to recover NH4+ from ammonium chloride containing waste waters. We use it.
Of course, getting down to very low figures for NH4+/NH3 would not be economical. A large steamrate and a large number of trays would be needed.

#3 Guest_Ben Thayer_*

Guest_Ben Thayer_*
  • guestGuests

Posted 24 May 2004 - 01:13 PM

ion exchange can remove ammonia to the 5 ppm range. this is relatively old technology. some units were built in the 70's by a company called Chemical Separations. I am unsure if they are still in business. they used nitric acid and the resulting ammonium nitrate was then recovered as a fertilizer solution.

#4 chemtiger

chemtiger

    Brand New Member

  • Members
  • 4 posts

Posted 16 June 2004 - 01:20 AM

By the steam stripping, it is easy to get a satisfied result. There are so many practical case.

#5 Guest_somnath_*

Guest_somnath_*
  • guestGuests

Posted 10 July 2004 - 01:02 PM

smile.gif steam stripping is the best option
Back to Student

Similar Topics




  1. Cheresources.com Community
  2. → General Chemical Engineering Forum
  3. → Student
  4. Guidelines / Rules for Posting