Structured Manufacturing Data (2026)

Multi-Stage Vacuum Evaporator Train

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Multi-Stage Vacuum Evaporator Train used in the Chemical Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Multi-Stage Vacuum Evaporator Train is characterized by the integration of Evaporator Body/Vessel and Calandria or Heat Exchanger Bundle. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel (e.g., 316L) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A series of interconnected vacuum evaporators used to progressively concentrate ammonium nitrate melt by removing water under reduced pressure.

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Product Specifications

Technical details and manufacturing context for Multi-Stage Vacuum Evaporator Train

Definition
A critical component within the Continuous Ammonium Nitrate Melt Production and Concentration System, the Multi-Stage Vacuum Evaporator Train consists of multiple evaporation vessels arranged in sequence. It operates under progressively lower pressures (higher vacuum) in each subsequent stage. This design allows for the efficient removal of water from the ammonium nitrate solution at lower temperatures, minimizing thermal degradation of the product and reducing energy consumption compared to single-stage evaporation. The train facilitates the continuous concentration of the melt to the required high solids content for subsequent prilling or granulation processes.
Working Principle
The train utilizes the principle of boiling point depression under vacuum. A weak ammonium nitrate solution is fed into the first effect (stage), which is heated (e.g., by steam). The generated vapor, instead of being condensed and discarded, is used as the heating medium for the next effect, which operates at a lower pressure (and thus a lower boiling point). This cascading use of vapor as a heat source across multiple stages significantly improves thermal efficiency. The concentrated melt is transferred from one stage to the next, with the final stage producing the desired high-concentration melt.
Common Materials
Stainless Steel (e.g., 316L), Carbon Steel (for non-wetted parts), Specialty Alloys (for corrosive zones)
Technical Parameters
  • Number of stages (e.g., 2-stage, 3-stage, 4-stage), which directly impacts energy efficiency and final concentration capability. (unitless) Per Request
Components / BOM
  • Evaporator Body/Vessel
    The main chamber where the ammonium nitrate solution is heated and partially evaporated.
    Material: Stainless Steel
  • Calandria or Heat Exchanger Bundle
    Provides the heating surface. Steam condenses on the shell side, transferring heat to the solution on the tube side.
    Material: Stainless Steel
  • Vapor-Liquid Separator
    Separates the vapor generated from the boiling liquid to prevent entrainment of droplets into the next stage or condenser.
    Material: Stainless Steel
  • Inter-stage Transfer Pump/Piping
    Moves the concentrated melt from one stage to the next, which operates at a lower pressure.
    Material: Stainless Steel
  • Vacuum System Connection Part
    Interface to the central vacuum system (e.g., steam ejectors, liquid ring pumps) that maintains the required low pressure in each stage.
    Material: Carbon Steel / Stainless Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Multi-Stage Vacuum Evaporator Train.

multi-stage vacuum evaporator train ammonium nitrate chemical manufacturing vacuum evaporator concentration stainless steel vacuum evaporator train ammonium nitrate melt concentration system interconnected vacuum evaporators chemical processing

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 10-100 kPa absolute (vacuum range for water evaporation)
flow rate: 5-100 m³/hr (depending on train configuration)
temperature: 80-150°C (typical operating range for ammonium nitrate concentration)
viscosity limit: Max 5000 cP (to maintain proper flow between stages)
slurry concentration: Up to 98% solids (final concentration achievable)
Media Compatibility
✓ Ammonium nitrate melt concentration ✓ Sugar syrup evaporation ✓ Pharmaceutical solvent recovery
Unsuitable: Chloride-containing solutions (risk of chloride stress corrosion cracking in stainless steel)
Sizing Data Required
  • Feed flow rate and initial concentration
  • Required final concentration and production rate
  • Available steam pressure and cooling water temperature

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Scaling and Fouling
Cause: Accumulation of dissolved solids (e.g., salts, minerals) on heat transfer surfaces due to evaporation, reducing thermal efficiency and increasing pressure drop.
Corrosion and Pitting
Cause: Exposure to corrosive process fluids, high temperatures, and vacuum conditions, particularly at welds, gaskets, and low-flow areas, leading to material degradation and leaks.
Maintenance Indicators
  • Significant drop in vacuum level or inability to maintain target vacuum, indicating air ingress, seal failure, or pump issues.
  • Unusual noise (e.g., knocking, grinding) from pumps or motors, suggesting mechanical wear, cavitation, or bearing failure.
Engineering Tips
  • Implement regular chemical cleaning or descaling protocols based on process fluid analysis to prevent fouling and maintain heat transfer efficiency.
  • Use corrosion-resistant materials (e.g., stainless steel, alloys) for critical components and apply protective coatings or cathodic protection where feasible.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems ASME BPE-2022 - Bioprocessing Equipment PED 2014/68/EU - Pressure Equipment Directive
Manufacturing Precision
  • Surface Finish: Ra ≤ 0.8 μm for product contact surfaces
  • Weld Alignment: ±1.5 mm maximum deviation from true centerline
Quality Inspection
  • Helium Leak Test: ≤ 1×10⁻⁹ mbar·L/s maximum allowable leak rate
  • Material Certification Verification: Traceability to ASTM A240/A240M for stainless steel components

Factories Producing Multi-Stage Vacuum Evaporator Train

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the key advantages of using a multi-stage vacuum evaporator train for ammonium nitrate concentration?

Multi-stage vacuum evaporator trains provide progressive concentration with energy efficiency, precise control over final product concentration, reduced thermal degradation of ammonium nitrate, and lower operating temperatures due to vacuum operation.

What materials are recommended for different components in the evaporator train?

Stainless steel (316L) is used for wetted parts, carbon steel for non-wetted structural components, and specialty alloys for highly corrosive zones to ensure durability and chemical resistance throughout the concentration process.

How does the vacuum system improve ammonium nitrate concentration efficiency?

The vacuum system lowers the boiling point of water, allowing evaporation at reduced temperatures, which minimizes ammonium nitrate decomposition, reduces energy consumption, and enables more precise control over concentration levels.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Chemical Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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