UniSieve is a Switzerland-based cleantech company spun out of ETH Zurich, providing advanced molecular-sieving membranes that enable energy-efficient gas separations. Our mission is to decarbonize hard-to-abate industries by replacing energy-intensive processes—such as distillation and amine scrubbing—with plug-and-play membrane systems that reduce energy use by up to 90%. We focus on two major industrial challenges: olefin recovery and point source carbon capture. Our modular membrane platform offers scalable and energy-efficient alternative to conventional separation processes. UniSieve's solutions are proven at scale and ready to accelerate the transition to a low-carbon future.