Absorption Column System for Nitric Acid Production

Product Specifications

Technical details and manufacturing context for Absorption Column System

Definition

The Absorption Column System is a key unit within the Integrated Nitric Acid Production and Concentration System. It absorbs nitrogen oxides (NOx) from the oxidation process into water under controlled conditions to produce nitric acid. The system typically consists of multiple absorption stages with cooling to maximize acid concentration and minimize nitrogen oxide emissions. It is designed for chemical manufacturing applications where nitric acid is produced. The system operates by introducing nitrogen oxide gases (primarily NO and NO₂) into the absorption column, where they react with water in a counter-current flow arrangement. The absorption process involves chemical reactions where nitrogen oxides dissolve in water to form nitric acid and nitrous acid, with oxygen present to oxidize NO to NO₂ for more efficient absorption. Cooling is applied to remove the exothermic heat of reaction and improve absorption efficiency. Materials on file include stainless steel (typically 304L or 316L), specialty alloys for corrosive environments, and ceramic packing materials. Key parameters include operating pressure (1.0–1.6 MPa), design temperature (40–120°C, GB/T 150), absorption efficiency (95–99%), packing height (6–12 m), column diameter (1.5–4.0 m), material grade (304L–316L, ASTM A240), wall thickness (8–20 mm, GB/T 709), pressure drop (0.5–2.5 kPa), liquid load (10–40 m³/m²·h), gas velocity (1.0–2.5 m/s), weight (15–60 t), and corrosion allowance (1.5–3.0 mm, GB/T 150). These values are reference ranges and must be verified for the specific model and application. The system is a component, not a complete plant, and its selection depends on process conditions such as gas composition, flow rates, and desired acid concentration. Verification questions include confirming the actual operating pressure and temperature, material grade, and compliance with relevant standards. Maintenance signals include increased pressure drop, reduced absorption efficiency, or corrosion damage. Failure boundaries include operating outside the specified pressure or temperature limits, which can lead to insufficient absorption or material failure.

Working Principle

Nitrogen oxide gases (primarily NO and NO₂) are introduced into the absorption column where they react with water in a counter-current flow arrangement. The absorption process involves chemical reactions where nitrogen oxides dissolve in water to form nitric acid and nitrous acid, with oxygen present to oxidize NO to NO₂ for more efficient absorption. Cooling is applied to remove the exothermic heat of reaction and improve absorption efficiency.

Common Materials

Stainless steel (typically 304L or 316L), Specialty alloys for corrosive environments, Ceramic packing materials

Technical Parameters

Parameter	Typical range	Notes & selection driver
Design Temperature	40–120 °C	Above 120°C requires special gasket materialGB/T 150
Absorption Efficiency	95–99 %	Higher efficiency reduces NOx emissions
Packing Height	6–12 m	Determines residence time and absorption
Column Diameter	1.5–4.0 m	Affects gas velocity and pressure drop
Material Grade	304L–316L	316L for enhanced corrosion resistanceASTM A240
Wall Thickness	8–20 mm	Based on pressure and corrosion allowanceGB/T 709
Pressure Drop	0.5–2.5 kPa	Lower drop reduces energy consumption
Liquid Load	10–40 m³/m²·h	Ensures proper wetting of packing
Gas Velocity	1.0–2.5 m/s	Above 2.5 m/s causes flooding
Weight	15–60 t	Includes internals and nozzles
Corrosion Allowance	1.5–3.0 mm	Based on acid concentration and temperatureGB/T 150

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

Column Shell
Main pressure vessel containing the absorption process

Material: Stainless steel
Packing Material Part
Provides surface area for gas-liquid contact and mass transfer

Material: Ceramic or metal structured packing
Liquid Distributor
Evenly distributes water/acid solution across the packing

Material: Stainless steel
Gas Inlet Part
Introduces nitrogen oxide gases into the column

Material: Stainless steel
Cooling Coils Part
Removes heat generated during the exothermic absorption reaction

Material: Stainless steel
Demister
Separates liquid droplets from exit gas stream

Material: Stainless steel mesh

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Frequently Asked Questions

What is the typical operating pressure range for the Absorption Column System?

The reference range is 1.0–1.6 MPa, but the actual value depends on the specific design and application. Always verify with the manufacturer.

What materials are commonly used in the Absorption Column System?

Stainless steel (typically 304L or 316L), specialty alloys for corrosive environments, and ceramic packing materials are listed. Confirm the exact grade for your process.

How does the absorption efficiency affect NOx emissions?

Higher absorption efficiency (95–99% reference range) reduces NOx emissions. The actual efficiency depends on operating conditions and design.

What standards are referenced for the Absorption Column System?

Standards such as GB/T 150, ASTM A240, and GB/T 709 are listed as references. They are not proof of certification; verify compliance 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:	0.5-8 bar (typical 3-5 bar)
flow rate:	50-500 m³/h (gas), 10-100 m³/h (liquid)
temperature:	20-50°C (optimal 30-40°C)
NOx concentration:	5-15% v/v (inlet gas)
slurry concentration:	Not applicable (liquid absorption system)

Absorption Column System

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards