Mantel

Mantel Capture is developing a carbon capture system that uses molten borates to capture CO2 emissions from industrial sources. A spin-out of MIT's Department of Chemical Engineering, the company is the first developer of molten-salt carbon capture that uses high-temperature, liquid-phase carbon capture materials to capture CO2 at the source of emissions.

Mantel's technology operates at the high temperatures found in boilers, kilns, and furnaces, enabling highly efficient carbon capture that recovers high-value heat during the absorption process. By offsetting the energy required to regenerate the molten borate material, the company can capture CO2 from industrial emissions more efficiently, reducing capture costs by more than half compared with conventional amine-based carbon capture technologies.

As of September 2024, Mantel's technology had demonstrated lab-scale carbon capture of half a ton per day. The company planned to implement a demonstration project at an industrial site designed to capture 1,800 tons of CO2 emissions per year, which would be ~10x larger than its lab-scale operations. Once fully operational, the company expected to capture carbon at ~USD 30–50 per ton.

Key competitors: None comparable (Mantel Capture is the only startup that uses bolten borates to capture CO2 emissions)