Kühni agitated columns (ECR)

Robust design for changing hydrodynamic conditions

In extraction with high mass transfer and/or changing physical properties, this is the column of choice. The geometry of the agitated compartments can be adapted for changing hydrodynamic conditions. Other main features are special mixing turbines and perforated partition plates.

Internals of Kühne agitated columns (ECR) for liquid-liquid extraction
Main benefits
  • Universal use 
  • High flexibility for varying process parameters and physical properties 
  • Reliable scale-up 
  • More than 30 theoretical stages in one single column
Main applications
  • Simultaneous separation of various components with widely differing boiling points     
  • Separation of high-boiling products or pollutants that are present in only low concentrations
  • Separation of components with similar boiling points or components forming azeotropes 
  • Separation of mixtures with thermally sensitive components 
  • Selective separation of single components out of a complex mixture
Application and design
Installation of industrial ECR extraction column at customer's site
Industrial ECR extraction column

Application

In general, liquid-liquid extraction is applied where alternative separation technologies such as distillation are uneconomical, or even unsuitable. Our portfolio includes a complete range of liquid-liquid extraction equipment, enabling us to provide you with the most appropriate solution for your requirements. In addition to agitated columns, it includes mixer-settlers and packed columns.

Design

Our portfolio includes a complete range of liquid-liquid-extraction equipment, enabling us to provide you with the most appropriate solution for your requirements. In addition to agitated columns, it includes mixer-settlers and packed columns.  

The agitated Kühni column has a simple and robust design. The drive unit and the shaft are supported at the top of the column, allowing you to use all common types of shaft seals (stuffing box, mechanical seals). In special cases, the seal can be replaced by a magnetic drive. Only radial slide-bearings are necessary inside the column, which are accessible through hand or man holes. The sturdy design, the selected materials, and the low rotational speed of industrial columns (typically 10-100 rpm) allow a practically maintenance-free operation.

Features

Features

  • Standard turndown 1:3
  • Diameter: 30 mm – 3.5 m
  • Phase ratio up to 70:1
  • Physical properties
    • Density difference > 50 kg/m3
    • Viscosity: up to 500 mPas
    • Interfacial tension: >1mN/m

Material

  • Stainless steel / higher alloys
  • PP/PVDF/PFA
How can we help you?

Talk or write to our experts to find your best solution.