Mantel Raises USD 18 Million to Commercialise High-Temperature Carbon Capture

Carbon-capture startup Mantel has raised USD 18 million to move its high-temperature liquid-phase system into power, oil and gas, and pulp-and-paper applications. The company says total capital raised has reached USD 50 million.

Spun out of MIT chemical engineering in 2022, Mantel uses a molten-borate loop to capture carbon dioxide at industrial temperatures and recover heat as high-pressure steam.

Carbon capture is constrained by energy penalties, corrosion, material life, integration downtime and downstream transport and storage costs. Laboratory efficiency must be demonstrated again in continuous commercial operation.

The financing includes strategic investments from Constellation Technology Ventures and Azimut Investments and will support commercial deployment. The company cites applications in Canadian energy and paper operations and a West Virginia data-centre energy campus.

The financing and deployment direction are public. Claims of 97 percent lower energy loss and costs below half the industry average lack a complete baseline, operating hours and independent verification in the source and therefore remain unverified claims.

Successful high-temperature heat integration could improve capture economics. Weak material durability or insufficient downstream storage could still prevent system-level scale.

SNN editorial analysis: For Taiwan steel, cement, petrochemical, paper and combustion-intensive industries, Mantel's financing shows that modular high-temperature capture is seeking commercial validation, but funding and company performance claims are not evidence of local deployment. Taiwan should use Pre-Disclosure Evidence Infrastructure to fix flue-gas conditions, energy penalties, material durability, capture rates, unit costs, transport and storage interfaces, maintenance responsibility and long-term performance before decisions, then test suitability through local demonstrations and independent measurement.

Next checks should cover commercial unit size, continuous-operation data, third-party validation and the first measured volumes permanently stored.