WRK Design and Services Ltd - Consulting Chemical Engineers

Consulting Chemical Engineers

PO Box 11676, Birmingham B29 7ZB, United Kingdom
Tel: +44 121 227 5284 • Fax: +44 121 414 5353
Mobile: Dr S Raymahasay: +44 7838 137988

Our Technology > The DGC's Advantages

The following are some of the Downflow Gas Contactor's properties and advantages:

  • Stable bubble matrix formed
  • Distinct gas-liquid interface
  • Lower power consumption
  • Smaller operating volume; Smaller Footprint
  • No foaming
  • No free gas-liquid interface
  • Inherently safe
  • 100% gas utilisation
  • Greater than 95% approach to equilibrium in very short contact times
  • High and accurate control of interfacial areas
  • Improved reaction rates and selectivity
  • No internal moving parts
  • Reduced capital and operating costs
  • Higher gas hold-ups (50-60%)
  • Tolerance to particulates
  • Easy scale-up without loss in efficiency
  • Easy automation and control
  • Batch, semi-autonomous or continuous mode operation

Some videos of the DGC reactor

In this video you see a bubble column developing within a DGC reactor. Here are some details about what you see at various times within the video.

Time Description
7 seconds Start-up of DGC Gas input into flowing reaction media with catalyst
18 seconds Bubble column develops
35 seconds Gas input reduced – bubble column height reduces as reaction occurs with Gas utilisation, till equilibrium level attained
59 seconds As Gas input increased bubble dispersion column develops again


In this video you see bubble dispersion maintaining level in the DGC column with 100% gas absorption at continuous flow conditions; greater than 95% equilibrium concentrations are achieved.

Contact us now if you would like further information on the DGC and how our services can help you.