pH control in ammonia scrubbers
pH control in ammonia scrubbers
(OP)
We are venting our excess ammonia from urea plant into two scrubbers those are not packed bed. We are using nitric acid to neutralize ammonia and in the end giving ammonium nitrate to UAN plant. We are facing two problems. (1)pH control is very eratic. Unable to control pH at 6 or 7. (2)Even at pH of 2 or 3 still getting ammonia emissions from the stacks.Are there any simple solutions to these problems?
Thanks.
Thanks.





RE: pH control in ammonia scrubbers
A solution to this problem seems to me a precipitation of NH3 in form of some salt and removal from the system.
2.Without a packed bed your scrubber actually works more or less as a homogeniously mixed reactor.In such a reactor there is always a part of not reacted input flow in the outflow.Try to rearange it as a pure counterflow reactor.
RE: pH control in ammonia scrubbers