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Desublimation is a not widely known substance separation method for gas mixtures. However, at KTS, desublimation is a well-established process for which we have been delivering equipment for more than 60 years for several applications. This successful history started in the 1950’s with the separation of phthalic anhydride as a product from a gas phase reaction. During the last few decades we have been expanding the range of application, finding new substances which can be separated using desublimation. Carbon dioxide is one of these applications, for which we have not only carried out a deep theoretical work with universities and well-renowned international institutes, but also, we have delivered desublimators for a full-scale pilot plant where our desublimators achieved the stringent requirements of the customer. We will present the results of this theoretical work, as well as the outcomes of the pilot plant.