KC8 Carbon Capture Solutions

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UNO MK3 Precipitating Potassium Absorption System

Page last modified
April 11 2024

UNO MK 3 is a novel solvent absorption process initially invented within the Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC) and developed over the last decade by KC8. It is a catalytically enhanced precipitating solvent technology engineered to capture 90+ per cent of carbon dioxide (CO2) emissions from heavy industry sources such as cement plants, steel mills, chemical plants and CCGT power stations.  The hard to abate industries. UNO MK 3 process is suitable for retrofitting to existing emission sources as well as for new build plants. The process is applicable to all CO2 sources, however due to its robust nature it has been particularly successful in high oxygen flue gases typical of Natural Gas Combined Cycle (NGCC) generators.

Potassium carbonate (K2CO3) has been used in solvent absorption processes in chemical industries for many years. The patented UNO MK 3 process provides a unique update to this established technology, making it highly efficient for CO2 capture at low pressure. 

Plant testing of UNO MK 3 has been completed under real flue gas conditions at Hazelwood Power Station in the Latrobe Valley, Australia. These trials have successfully demonstrated the five key benefits of the UNO MK 3 process, namely:

  • High CO2 capture rate over a wide pressure range
  • Low energy of regeneration
  • Low overall installation and operating cost
  • Low volatility and environmental impact
  • Multi-impurity capture and production of valuable by-products

Two commercial demonstration plants are now underway, in design.  Both are to be installed in 2024, one in Australia on a cement kiln and one in the USA at the National Carbon Capture Center for the DoE.

Pros & Limitations
High CO2 removal rate (90-95%) from post combustion flue gas
Low capex (up to 50% lower the current equivalent plants) due to lower circulation rates, smaller equipment and unique contractor design for large flow
Low opex, <15% low operating costs due to the low heat of regeneration required
Safe, non- toxic material. Easy to handle and use
High oxygen tolerance. Limited solution losses
Lower pressure CO2 outlet stream will require compression
Requires inlet blower to feed contactor with flue gas
Specification Title Specification Description
Area of Application
Hard to abate industries - cement, steel, chemical, power generation.
Large Scale
Designed for high volume, lower pressure post combustion flue gas.
Easy to Install
Retrofit or green field. Minimal process impact, designed to operate at the flue gas/process gas outlet.
Small Dimensions
Low footprint for easy retrofit to existing plants. Unique absorber/stripper design for large scale applications.
Low Operating Costs
Next generation capture technology operating at $35-$40/t CO2 captured.
High Oxygen Tolerance
Solution is designed to operate in high O2 environments with out degradation.


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Technology Readiness Level

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Development Technology demonstration Mature / Proven
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KC8 Capture Technologies Ltd (KC8), previously known as UNO Technology Pty Ltd, is committed to making a difference by lowering greenhouse gas emissions around the world. Our technology will reduce the impact of anthropogenic climate change to ensure a better future for generations to come.

Our belief is that this growing global issue requires a balanced solution to lowering emissions for all sectors – energy and industrial alike. The full range of emissions reduction tools will be required including energy efficiency, renewable, nuclear, lower carbon intensity fuel and Carbon Capture Utilisation and Storage (CCUS). Our team continues to develop a range of intellectual property that will contribute to lower the cost of capture, in turn enhancing and accelerating CCUS as a leading greenhouse gas mitigation tool.

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