Innosepra, LLC

Biogas is a combustible gas mixture (60-70% methane, 30-40% CO2) produced by the anaerobic fermentation of biomass by bacteria. Biogas is a renewable fuel as it reduces greenhouse gas emissions through fuel substitution, switching from a fossil fuel to a renewable fuel. The sources of biogas are dairy farms (manure), garbage landfills, wastewater treatment plants, and industrial plants such as the food processing plants. There are several thousand such plants throughout the world in sizes ranging from 200-10,000 Nm3/hr of biogas. A significantly higher value can be obtained for the biogas if it is upgraded to pipeline quality natural gas. Based on EPA estimates, recovery of more than 2 million tons of methane per year (>$250 MM/yr market) from swine and dairy farms alone is possible. The InnoSepra technology for biogas purification is based on a combination of microporous sorbent materials with weak affinity for carbon dioxide, and a novel process cycle. Its total energy requirement is at least 50% lower than the competition (amine, membranes, water wash, and pressure-swing adsorption). Based on extensive field and laboratory tests, the process provides a methane purity of over 99% and has a methane recovery of over 95%.

The methane product has less than 1 ppm each of water and hydrogen sulfide. The process has a very high sorbent productivity, operates at close to atmospheric pressure, and is non-corrosive. Based on a detailed engineering design, the significantly smaller equipment size coupled with the ability to use cheaper materials of construction—carbon steel—provides a capital savings of 60-70% over the competition. The combination of lower capital and energy requirement results in about 60% reduction in the cost of biogas purification.