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225 Metric Ton Per Day Nitric Acid Plant Capacity: 225 Metric Tons per Day Technology: Chemico Built: 1976 Shut Down: Main Compressor: 4 stage Ingersoll Rand compressor with 2000 hp steam turbine drive. Products Produced: 100% nitric acid produced as a 54.0 wt.% aqueous solution, containing not more than 0.05% HNO2. Documentation: Available Raw Materials: Ammonia – 5822 lbs/hr , NH3 – 99.5% Air – 23.200 SCRM(DAY) Clean atmospheric air Condensate – 10,270 lb/hr (from steam turbine condenser) free of suspended solids and chlorides. Overview: General process begins with compressed air, compressed to 135 psia @ 450 degrees F, by the turbine driven centrifugal compressor and mixed with superheated ammonia vapor. This mixture flows through the ammonia converter where the ammonia is catalytically oxidized to nitric oxide. The process gas leaves the catalyst gauze at about 1650 degrees f and passes in succession through the turbine gas heater, the burner gas boiler (generating 25psig steam), the platinum recovery filter, the tail gas heater, the boiler feed water heater, the nitric gas cooler and the water cooled weak acid condenser. The gas at about 140 degrees F enters the absorption tower below the oxidation trays. The acid condensed which is approximately 80wt.% HNO3 flows to the corresponding trays in the absorption tower. In the absorption town Nitrogen dioxide forms nitric acid by reaction with the water on the bubble cap trays in the tower. Tail gas is processed and vented to the atmosphere. |
