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 H<sub>2</sub>S and CO<sub>2</sub> 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. SepR<sub>8</sub> revolutionizes the sweetening of sour gas by eliminating the need for amines, instead using liquid CO<sub>2</sub> to remove and purify the acid gasses (H<sub>2</sub>S and CO<sub>2</sub>), inherently capturing all the CO<sub>2</sub> 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.