< About us

About us

About us



Advisory board




Capsol Technologies is a carbon capture technology provider with a goal of accelerating the transition to a net zero future.  

Capsol’s post-combustion carbon capture and heat recovery system in one delivers superior efficiency with a proven and safe solvent. Key segments include cement, biomass, energy-from-waste and gas turbines. 

Capsol’s technologies are applicable to all hard-to-abate industries and deliver superior performance throughout the entire carbon capture process, ensuring safe operations and industry-leading capture costs. Capsol’s solutions utilize the non-toxic and non-degradable solvent HPC, with superior HSE profile making permitting easier. The technology is licensed either directly to customers or through industrial partners globally. 

Capsol’s technologies are based on 15+ years of R&D, with active patents across eleven patent families, and more than 11,000 hours in operation with a chemistry that is industry-proven in hundreds of plants. 

Capsol Technologies' goal is to help accelerate the transition to a carbon negative future


To accelerate the world's transition to a net zero future


Deliver energy-efficient and safe carbon capture technologies

The history behind Capsol's proprietary technologies

Capsol Technologies' carbon capture technologies are based on a chemical process using the safe solvent Hot Potassium Carbonate (HPC).    

HPC as a solvent has been used to capture carbon dioxide for many decades (pre-combustion), with hundreds of HPC plants in commercial operation in the chemical process industry.

The technology was initially invented and developed by the U.S. Bureau of Mines in the 1940s and 50s, with further developments made in the 1970s. It is a robust, non-degradable (in the presence of oxygen), easily accessible absorbent, and is field proven for medium to large scale processes.

The development of Capsol Technologies' proprietary HPC technology for post-combustion CO2 capture started in 2003. 

The first successful tests of the technology were performed at the Värtan combined heat and power (CHP) plant in Stockholm, Sweden, in 2008. The tests performed at Värtaverket showed a high CO2 capture efficiency of >98%.

In 2016, Stockholm Exergi commissioned a new CHP plant KVV8, at Värtaverket, which is run on wood chips based on forestry residues such as tree branches and tops as the main fuel (i.e. the plant utilizes secondary biomass).

In July 2022, Stockholm Exergi signed a Patent License agreement for the use of Capsol's HPC technology for carbon dioxide capture at their plant KVV8. The facility has the potential of capturing 800,000 tons of CO2 per year, making it Europe's first large-scale plant with negative CO2-emissions when operational.

A simplified overview of the patented Capsol process

The CO2 rich flue gas is compressed to around 5-8 bar(a) (depending on the CO2 concentration) before it enters the bottom of the absorber, where the pressurised flue gas reacts with the downwards flowing solvent. The lean flue gas leaves the absorber column at the top.

The CO2 rich solvent leaves the absorber at the bottom, is de-pressurised, and led to the top of the desorber, where the partial CO2 pressure is low, forcing the solvent to release its high CO2 content to the steam flow.

The pure CO2 leaves the top of the desorber, from where it can be liquified and further processed. The lean solvent is lead back to the top section of the absorber.