Nitric Acid Concentration Column | Distillation Component

Product Specifications

Technical details and manufacturing context for Concentration Column

Definition

The concentration column is a critical component within the Integrated Nitric Acid Production and Concentration System, specifically responsible for increasing the concentration of nitric acid from its initial dilute state (typically 50-60%) to a commercial-grade concentration (typically 68-70% or higher). It operates as a distillation unit where heat is applied to vaporize water and some nitric acid, with the vapors then condensed and refluxed to achieve the desired acid strength in the bottom product. The column is designed for fractional distillation, with feed entering at an intermediate tray and heat supplied at the bottom via a reboiler. Due to differences in volatility, water vaporizes more readily than nitric acid, and the counter-current contact between rising vapor and descending liquid on trays or packing facilitates mass transfer. The vapor leaving the top is condensed; part is returned as reflux to control separation, and the rest is removed as overhead product. Concentrated nitric acid is drawn from the bottom. The process may operate under vacuum or atmospheric pressure, depending on design, to manage temperatures and prevent excessive decomposition of nitric acid. Materials of construction include stainless steels (e.g., 304L, 316L) and special alloys (e.g., high-silicon iron, zirconium) for high concentrations, with ceramic packing if a packed column is used. Key parameters include column diameter (600–3600 mm), height (10000–30000 mm), processing capacity (5–50 t/d), operating pressure (1.0–1.6 MPa), operating temperature (80–120°C), feed concentration range (30–68%), concentration accuracy (±0.5%), material (304L/316L per ASTM A240), tray type (sieve/valve), number of trays (20–60), tray spacing (300–600 mm), and weight (5000–30000 kg). These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.

Working Principle

The column operates on the principle of fractional distillation. Dilute nitric acid is fed into the column, typically at an intermediate tray. Heat is supplied at the bottom (reboiler) to vaporize the mixture. Due to differences in volatility, water vaporizes more readily than nitric acid. The vapor rises through the column, contacting descending liquid (reflux) on trays or packing. This counter-current contact allows for mass transfer: water concentrates in the vapor phase moving upward, while nitric acid concentrates in the liquid phase moving downward. The vapor leaving the top is condensed; part is returned as reflux to control separation, and the rest is removed as overhead product (dilute acid or water). Concentrated nitric acid is drawn from the bottom. The process often operates under vacuum or atmospheric pressure, depending on the design, to manage temperatures and prevent excessive decomposition of nitric acid.

Common Materials

Stainless steel (e.g., 304L, 316L), Special alloys (e.g., high-silicon iron, zirconium for high concentrations), Ceramic packing (if packed column)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Column Diameter	600–3600 mm	Determines throughput capacity
Column Height	10000–30000 mm	Affects separation efficiency
Processing Capacity	5–50 t/d	Based on feed acid concentration
Operating Temperature	80–120 °C	Above 120°C accelerates corrosion
Concentration Range	30–68 %	Feed concentration range
Concentration Accuracy	±0.5 %	Product concentration tolerance
Material	304L/316L	Corrosion resistance for nitric acidASTM A240
Tray Type	Sieve/Valve	Valve trays for fouling resistance
Number of Trays	20–60	More trays increase separation
Tray Spacing	300–600 mm	Affects entrainment and capacity
Weight	5000–30000 kg	For foundation and lifting

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 distillation process.

Material: Stainless steel
Distillation Trays/Packing
Provide surface area for vapor-liquid contact to enhance separation efficiency.

Material: Stainless steel or ceramic
Reboiler
Supplies heat at the bottom to vaporize the liquid, driving the distillation.

Material: Stainless steel
Condenser
Cools and condenses vapor from the top of the column, producing reflux and overhead product.

Material: Stainless steel
Feed Inlet Nozzle Part
Entry point for dilute nitric acid feed into the column.

Material: Stainless steel
Product Outlet Nozzle Part
Exit point for concentrated nitric acid from the bottom.

Material: Stainless steel
Reflux Return Line
Returns part of the condensed overhead to the top of the column as reflux, which is what sets the separation.

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Frequently Asked Questions

What is the typical feed concentration for this concentration column?

According to the directory reference, the feed concentration range is 30–68%. This is a general range; the actual feed concentration must be confirmed for the specific model and application with the legal manufacturer or supplier.

What materials are commonly used for construction?

Common materials include stainless steels such as 304L and 316L, and special alloys like high-silicon iron or zirconium for high concentrations. Ceramic packing may be used if the column is packed. Material selection should be verified against the specific process conditions.

What is the operating pressure range?

The directory lists an operating pressure range of 1.0–1.6 MPa. This is a reference range and should be verified for the actual column design and application.

How does the column achieve separation?

The column uses fractional distillation. Heat is applied at the bottom to vaporize the mixture, and because water is more volatile than nitric acid, water concentrates in the vapor phase rising upward, while nitric acid concentrates in the liquid phase descending. Reflux and counter-current contact on trays or packing enhance the separation.

Data Basis

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

Preliminary Technical Classification

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pressure:	Vacuum to 5 bar (operating pressure range)
flow rate:	1-100 m³/h (liquid feed rate capacity)
temperature:	+80°C to +120°C
slurry concentration:	Not applicable (handles liquid solutions only)

Concentration Column

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