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Baker Hughes acquires exclusive license from SRI International for mixed salt process technology for carbon capture

Baker Hughes has entered into a global exclusive licensing agreement with SRI International to use SRI’s innovative Mixed-Salt Process (MSP) for CO2 capture. SRI has received support from the US Department of Energy’s Office of Fossil Energy (FE) and National Energy Technology Laboratory (NETL) in developing its MSP technology.

The MSP developed by SRI currently has a technology readiness level of 4 as per the scale defined by the European Union as part of the Horizon 2020 framework program. The MSP combines readily available potassium and ammonia (NH3) salt solutions to enable reduced reboiler and auxiliary electric loads, emissions, and water usage. In addition, the MSP requires a smaller footprint than competing CCUS solutions.


The MSP has been successfully tested in a large bench-scale system at SRI, with continuous integrated absorber and regenerator operation, achieving more than 90% CO2 capture, very high CO2 loading, a high-pressure CO2 product of more than 99% purity using a selective dual-stage regenerator, low ammonia emissions, and low reboiler duty.

The agreement with SRI follows Baker Hughes’ acquisition of Compact Carbon Capture (3C) announced in November 2020, and further expands and complements its CCUS (carbon capture, utilization, and storage) for applications such as the treatment of flue gases from fossil-fueled power plants, gas turbines, industrial applications, and the cement industry.

3C’s technology differs from traditional carbon capture solvent-based solutions by using rotating beds instead of static columns, effectively distributing solvents in a compact and modularized format. The rotating bed technology enhances the carbon capture process resulting in up to 75% smaller footprint and lower capital expenditures.

In addition, 3C’s modular and scalable configuration can be easily deployed into existing brownfield applications and can be optimized for a broad range of capacity and applications, including offshore and industrial emitters.

The advancement of carbon capture technology solutions is widely considered critical to delivering CO2 emissions reductions needed to meet global 2050 climate and net-zero emissions targets. In the energy and industrial sectors, carbon capture is among the most viable decarbonization paths for both retrofitting existing assets and greenfield projects. The Baker Hughes CCUS portfolio features advanced turbomachinery, solvent-based state-of-the-art capture processes, well construction and management for CO2 storage, and advanced digital monitoring solutions.

The Mixed-Salt Process combines an efficient, post-combustion carbon capture process that uses a novel solvent formulation that relies on commodity chemicals. Our process has the benefits of a low manufacturing carbon footprint, reduced energy consumption and greater efficiency. The technology also differentiates itself from other state-of-the-art amine-based carbon capture technologies by negligible solvent-degradation and reduced water use, as well as the fact it uses a widely available and environmentally friendly solvent.

As an energy technology company committed to the energy transition, Baker Hughes is the ideal partner to demonstrate the advantages and commercial benefits of our MSP solution.

—Manish Kothari, president of SRI International

Technology plays a key role in ensuring that new energy frontiers such as CCUS are cost-competitive and sustainable. In this period of CCUS market formation we are strategically and purposefully investing in the development and industrialization of innovative technologies to be deployed in a cost-effective manner once the market reaches maturity. Once commercialized, the MSP has the potential to contribute to the advancement of CCUS, providing a lower-cost and energy-efficient carbon capture solution with reduced emissions, making it ideal for commercial applications.

—Rod Christie, executive vice president of Turbomachinery & Process Solutions at Baker Hughes


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