Green Mill Supercritical manufactures supercritical CO2 fluid extraction systems, drawing on a history of Pittsburgh, PA-based supercritical carbon dioxide technology dating back to Carnegie Mellon University in the early 80s. Their systems incorporate scientific advancements and are customized for the needs of a rapidly evolving industry.
Clean Heat TechnologiesClean Heat Technologies grew out of Lalit Chordia’s supercritical-CO2 work, begun with his first company in 1990, and now brings more than 30 years of research to commercial heat-pump development. The Pittsburgh company is known for establishing a commercial-scale direct-exchange geothermal system using CO2 and designs systems for customers seeking lower-energy heating or cooling in buildings and industrial operations.PITTSBURGH, PA
EchogenEchogen develops and builds thermal energy systems based on supercritical carbon dioxide, turning waste heat into power and storing electricity as heat for grid and industrial applications. The Akron company brings nearly two decades of sCO₂ development to hands-on engineering, with systems designed, tested, and refined by its own team rather than left at the concept stage. Its 1.5 MWth heat engine completed more than 100 hours of autonomous operation at 600°C in 2024, while its power-conversion technology is also being developed for advanced nuclear reactors.AKRON, OH
eCO2DyeeCO2Dye develops and sells equipment and technology for dyeing textiles without water, using supercritical carbon dioxide in place of conventional water-based dye baths. Based in Allentown, the company supplies laboratory, pilot and production systems, with its main process focused on polyester yarn and thread that emerge dry after dyeing. Its broader work includes color matching and scCO2-based textile pretreatment and post-treatment, while carbon dioxide is recovered and recycled within the process.ALLENTOWN, PA
Cold JetWith more than 35 years in the field, Cold Jet manufactures dry ice blasting equipment and on-site dry ice production systems for industrial use. Based in Loveland, Ohio, the company’s technology uses recycled CO2 and supports a global installed base of more than 15,000 customers. Its dry ice blasting approach cleans without abrasives or secondary waste, while its production systems help businesses make dry ice where and when they need it.WEST CHESTER, OH