Dissolved Gases in Liquid Ammonia

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Sbindiaster1843
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Dissolved Gases in Liquid Ammonia

Post by Sbindiaster1843 » Mon May 14, 2018 11:52 am

Any info on Dissolved Gases in Liquid Ammonia?
S.Balasubramanian
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Liviu
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Re: Dissolved Gases in Liquid Ammonia

Post by Liviu » Sun Sep 23, 2018 5:57 pm

Hi,

Who is the licensor of your plant? Usually, respectable licensors include in their operating manual a diagram for solubility of gases in liquid ammonia.

Hope this will help.
Solubility of gas in ammonia.pdf
Regards.
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Sbindiaster1943
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Re: Dissolved Gases in Liquid Ammonia

Post by Sbindiaster1943 » Mon Sep 24, 2018 9:51 am

Thank U, Liviu for the info. Quite useful. Not all manuals give this info.
When Liquid Ammonia is used in Urea Plants as Raw Material. these dissolved gases end up as Absorber Off Gas and potential Fire hazard. Scrubbing off Residual Ammonia in the Gas Stream and adding Methane to get that out of Explosive Range is followed.
S.Balasubramanian

Liviu
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Re: Dissolved Gases in Liquid Ammonia

Post by Liviu » Mon Sep 24, 2018 4:22 pm

Hi Balasubramanian,
Good to know that helped you. You are right in case of ammonia coming from the let-down drum in the synthesis (this is in relatively new plants). If ammonia is taken from refrigeration system, former Kellogg plants in 1970, the dissolved gases in liquid ammonia are insignificant. Of course, there is a loss of energy to accomplish this.

Regards.

bedmonds
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Re: Dissolved Gases in Liquid Ammonia

Post by bedmonds » Wed Sep 26, 2018 6:19 pm

Hi Mr. Balasubramanian,
As an aside, in a similar situation we added a flash of the 18 bar ammonia (which was the feed to the urea plant) at 2.5 bars with vapours going to the refrigeration compressors. To avoid large loss of energy a feed effluent exchanger (hairpin type ) that exchanged the flashed ammonia with refrigeration system ammonia going to the synthesis loop chillers. In that way the ammonia to the urea plant is only a couple degrees colder than the 18 bar flash drum. Result was the HP scrubber in the urea plant was made very far from the explosive limit. I do have solubility data but am not sure I can pass along due to it's source perhaps wishing that it not be public. I'll try to find out.

rajneesh_jauhari
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Re: Dissolved Gases in Liquid Ammonia

Post by rajneesh_jauhari » Mon Oct 15, 2018 7:05 pm

Dear Mr Bedmonds
Thank you for sharing the information. Could u please share a Schematic of modification.

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