SepR8 leverages CO2 as a solvent to sweeten ultra-sour natural gas, unlocking economically stranded sour gas reserves that can enhance global low-emissions energy supply, and enable the world to responsibly reach our Net Zero goals.

SepR8 can turn even high-H2S sour gas into an economically viable and low carbon energy asset.


Large reserves of high-sulfur (sour) natural gas have been discovered in North America, the Middle East, Central Asia, and China. According to Carbon Counts’s 2010 CCS Roadmap for Industry, 40% of natural gas reserves are sour, with 20% being so sour they can't be economically or technically accessed. Sour natural gas must be “sweetened” by removing H2S and CO2 before it can be transported or used for power generation. Conventional methods are costly and physically impractical for many reserves, making it difficult for energy producers to justify utilizing these resources. As sweet gas reserves are depleted, the utilization of sour gas is projected to increase. The carbon intensity of gas processing is expected to grow over 200% by 2050, due to the higher energy requirements of sour gas processing. SepR8 revolutionizes the sweetening of sour gas by eliminating the need for amines, instead using liquid CO2 to remove and purify the acid gasses (H2S and CO2), inherently capturing all the CO2 produced. The novel solvent system significantly lowers the cost and environmental impact associated with sweetening and fractionating sour gas, enabling the production of ultra-low-carbon fuels and products.


To continue the transition to cleaner fuels like natural gas and derivatives like hydrogen and ammonia, we must economically and responsibly unlock the potential of sour gas reserves.


By using liquid CO2 to remove acid gasses and other sulfur species from sour gas, inherently capturing CO2 and other contaminants, we reduce both costs and environmental impact, with no upper limit on quantity of H2S present.

Key Innovation

SepR8 utilizes CO2 as a solvent and inherently captures all CO2 produced without the use of amines, reducing the CAPEX and OPEX of traditional solvent-based processes and increasing the overall system functionality.



SepR8 utilizes common gas processing unit operations, substantially decreasing its deployment risk. The CO2 solvent properties have been verified experimentally and commercial deployment opportunities are currently in development.

Feedstock Flexibility

Low cost and performance sensitivity to inlet H2S concentration allows economical generation of sweetened natural gas from a range of feed compositions.

Inherent Acid Gas Enrichment

Generates a pure stream of CO2, decreases the cost of sulfur recovery and acid gas disposal, and enables carbon capture operations.

Lower Environmental Impact

Lowers carbon intensity from processing sour natural gas, reduces utility consumption, and eliminates hazardous amine-solvents.

Simplified NGL Recovery

Performs NGL recovery without an additional fractionation plant, enabling more cost-efficient gas processing.

SepR8’s enhanced economic advantage with higher acid gas composition makes it a critical solution for meeting rising demand during the energy transition.

Unlock the potential of global sour natural gas with SepR8