Nitric Acid Plants for Sale

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Nitric Acid Plant - 550 STPD
Nitric Acid Plant - 550 STPD
Stock # 488
Capacity 550 STPD

Used 550 STPD Nitric Acid Plant built in 1987. The process is consisting of four main stages: oxidation of ammonia, oxidation of nitrous oxide, absorption of nitrous gas and catalytic tailgas treatment. Liquid ammonia is vaporized, and remaining ammonia is stripped in a batch operation. Gaseous ammonia is then mixed with compressed air, and the mixture undergoes ammonia oxidation in the ammonia burner. The NOx gas from the burner is cooled, oxidized to NO2, and further condensed. The cooled NOx partly condenses in feedwater preheaters, forming acid condensate pumped to the south absorption tower. Uncondensed NOx and secondary air enter the south absorption tower, where oxidation and absorption occur. The north absorption tower further oxidizes and absorbs NOx. Cooling is achieved using cooling water and chilled water. Demineralized water is pumped to the north absorption tower, producing acid transferred to the south absorption tower. Acid from the south absorption tower is pumped to the bleaching tower, where raw acid is contacted with secondary air. The final acid at 61% concentration is transferred to storage. The tailgas leaving the north absorption column contains unabsorbed NO and NO2. The tailgas is heated and treated in a catalytic tailgas reactor with ammonia vapor, reducing NOx content to less than 170 ppm. The treated tailgas passes through a turbine, generating energy for the air compressor, with additional energy supplied by an electric motor. The treated tailgas is discharged into the atmosphere through a stack. The plant was shutdown in 2016. All major spares are available: 8000 HP motor, spare compressor rotating assembly at Sulzer, spare mixed gas filter, blade carrier and various compressor spare parts on site. A spare expander exists and may be included in the sales package.

Nitric Acid Plant - 500 STPD
Nitric Acid Plant - 500 STPD
Stock # 369
Capacity 500 STPD

Used 500 STPD Nitric Acid Plant built in 1974. This Nitric Acid Plant uses synthesis by oxidizing ammonia to make nitrogen dioxide, then absorbed over a catalyst and water to form nitric acid. New major equipment was installed during 1994 - 2013. Atmospheric air is filtered and compressed in a centrifugal compressor, which is driven by a hot gas expander and steam turbine. Liquid ammonia is vaporized, superheated and filtered and is joined by the compressed air stream in a double mixing operation based on orificing. The combined ammonia-air mixture enters the converter where the ammonia stream ignites and burns very rapidly to form nitric oxide and water vapor. The hot reaction products and excess air leaving the converter pass through a waste heat boiler and heat exchanger to: cool the process gas before entering the cooler condenser; recover heat be the generation of steam; and recover power by heating the tail gas for use in the hot gas expander. Partially cooled process gas enters the cooler condenser where the water formed during ammonia burning is condensed, forming weak nitric acid. The weak acid is separated from the gas and transferred to the top of the absorber, where the weak acid and additional water are fed through the top tray and counter act with the gas moving up the absorber through the bottom. The product acid passes through a bleacher where dissolved oxides of nitrogen are stripped from the acid using a countercurrent flow of air, before flowing into the storage tank.

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