Integrated Nitric Acid Production and Concentration System

Product Specifications

Technical details and manufacturing context for Integrated Nitric Acid Production and Concentration System

Definition

This integrated system encompasses the entire industrial process for manufacturing concentrated nitric acid, starting from ammonia oxidation through to final concentration. It coordinates multiple unit operations including catalytic ammonia oxidation, nitrogen oxide absorption, and acid concentration via distillation or extractive methods. The system is designed for continuous operation in large-scale fertilizer and chemical plants, ensuring efficient conversion of ammonia to high-purity nitric acid while managing heat integration and emissions control. It represents a complete production solution rather than individual components. The system typically includes a platinum-rhodium catalyst gauze for ammonia oxidation, absorption columns for nitrogen oxides, and concentration columns using distillation or extractive agents such as sulfuric acid or magnesium nitrate. Materials of construction include stainless steel 304L/316L, Hastelloy C-276, and ceramic packing materials. Key parameters to verify for a specific installation include ammonia feed rate (15–60 kg/hr), oxidation reactor temperature (850–950°C), absorption tower pressure (0.4–0.6 bar), concentration column efficiency (95–99%), system energy consumption (0.8–1.2 kWh/ton), NOx emission level (≤200 mg/Nm³ per GB 31573-2015), operating pressure (1.0–1.6 MPa), operating temperature (-40–85°C), material grade (316L per ASTM A240), footprint (500–2000 m²), electrical supply (380 V AC ±10%, three-phase, 50 Hz per IEC 60038), and control system accuracy (±0.5%). These values are reference ranges and must be confirmed with the legal manufacturer for the actual model and application. The system is intended for continuous operation and requires careful integration of heat recovery and emission abatement. Buyers should verify compliance with applicable local regulations and standards, and confirm that the system meets their specific capacity and performance requirements.

Working Principle

Ammonia is catalytically oxidized to nitrogen oxides, which are absorbed in water to form weak nitric acid, then concentrated through distillation or extractive processes using sulfuric acid or magnesium nitrate. The oxidation reactor operates at 850–950°C, and absorption columns operate at 0.4–0.6 bar. The concentration columns achieve 95–99% efficiency. The system manages heat integration and emissions control to meet NOx emission limits.

Common Materials

Stainless Steel 304L/316L, Hastelloy C-276, Ceramic Packing Materials, Platinum-Rhodium Catalyst Gauzes

Technical Parameters

Parameter	Typical range	Notes & selection driver
Ammonia Feed RateRequired	15–60 kg/hr	Mass flow rate of ammonia feedstock
Oxidation Reactor TemperatureRequired	850–950 °C	Operating temperature in ammonia oxidation reactor
Absorption Tower PressureRequired	0.4–0.6 bar	Operating pressure in NOx absorption columns
Concentration Column EfficiencyRequired	95–99 %	Mass transfer efficiency in concentration columns
System Energy Consumption	0.8–1.2 kWh/ton	Total electrical energy per ton of nitric acid produced
NOx Emission Level	≤200 mg/Nm³	Nitrogen oxides concentration in tail gasGB 31573-2015
Operating Temperature	-40–85 °C	For equipment and piping
Material Grade	316L	Corrosion-resistant for acid serviceASTM A240
Footprint	500–2000 m²	Depends on capacity and layout
Electrical Supply	380 ±10% V AC	Three-phase, 50 HzIEC 60038
Control System Accuracy	±0.5 %	For temperature and pressure control

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Ammonia Oxidation Reactor
Catalytically converts ammonia to nitrogen oxides using platinum-rhodium gauzes

Material: Hastelloy C-276 with ceramic insulation
Waste Heat Boiler
Recovers heat from oxidation reaction to generate steam

Material: Carbon steel with stainless steel tubes
Absorption Column System
Absorbs nitrogen oxides in water to form weak nitric acid using multiple packed columns

Material: Stainless Steel 304L with ceramic packing
Concentration Column
Concentrates weak nitric acid to commercial strength via distillation

Material: Stainless Steel 316L with structured packing
Tail Gas Heater Optional
Preheats tail gas before catalytic reduction of residual NOx

Material: Stainless Steel 304
Process Control System
Integrated DCS/PLC system for monitoring and controlling all process parameters

Material: Industrial-grade electronics in NEMA 4X enclosures
Catalytic NOx Reduction Reactor
Reduces the residual NOx in the tail gas before it goes to stack.
Sulfuric Acid Extractive Section
Strips water from the weak acid with a dehydrating agent so the acid can go above the azeotrope.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Integrated Nitric Acid Production and Concentration System.

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Frequently Asked Questions

What is the typical ammonia feed rate range for this system?

The ammonia feed rate is typically in the range of 15–60 kg/hr, but this is a reference range. The actual feed rate depends on the system capacity and configuration, and must be confirmed with the manufacturer for your specific model.

What materials are used in the construction of this system?

Common materials include stainless steel 304L/316L, Hastelloy C-276, and ceramic packing materials. The material grade for acid service is often 316L per ASTM A240, but you should verify the exact materials with the supplier based on your process conditions.

What standards are relevant for verifying this system's compliance?

Relevant standards include GB 31573-2015 for NOx emission levels, ASTM A240 for material grade, and IEC 60038 for electrical supply. These are reference standards; actual compliance must be confirmed with the manufacturer and local authorities.

What is the system's energy consumption per ton of nitric acid?

The total electrical energy consumption is typically 0.8–1.2 kWh per ton of nitric acid produced. This is a reference range and may vary depending on operating conditions and system design. Confirm the specific value with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0.5-10 bar (typical operating range)
flow rate:	100-5000 Nm³/h ammonia feed (scalable)
temperature:	400-950°C (oxidation), 20-200°C (absorption/concentration)
slurry concentration:	Not applicable (gas-phase process)
nitric acid concentration:	50-68 wt% (standard), up to 98 wt% (concentrated)