This 321 stainless steel, high-pressure ammonia recovery system was designed by ICI and built by Robert Jenkins, LTD. The column is rated for 275 psig at 220°C. The system used a high-pressure steam-driven reboiler to strip ammonia from crude amine products.
The 321 stainless steel (10.5% Ni) column is 2.5' diameter by 54' straight side. It has a design pressure of 275 psig/FV @ 220°C. The column has 22 single-pass valve trays also constructed of 321 stainless steel. The column has an internal overhead condenser mounted in the top head. It also has an internally mounted reboiler in the bottom section of the column. The system includes a feed interchanger, and a column overheads cooler.
Feed to the column is heated by cross-exchanging with the reactor outlet flow from another system using a feed interchanger. The interchanger is constructed of 321 stainless steel on both the shell and tube sides. The feed enters the column around the tray #8 area, but there are other optional feed entry points.
An internal condenser is used in the top of this column to condense the ammonia in the overhead stream. The condensed ammonia is collected and further cooled in the overheads cooler before being sent to storage.
The hot reactor outlet stream from another system is cross-exchanged with the incoming feed using an interchanger.
High-pressure steam is used on the reboiler to provide the separation momentum.
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