Abstract: A process for separation of a synthesis feed gas mixture containing hydrogen, carbon monoxide and methane. The feed gas mixture is countercurrently contacted with methane wash liquid in a first adsorption zone and the recovered absorber bottoms liquid is contacted with hydrogen rich vapor in a second adsorption zone to recover residual hydrogen gas as overhead. Hydrogen rich vapor is generated for the second absorption zone by vaporization of second absorption zone bottoms liquid, with the bottoms liquid recovered from the second absorption zone being fractionated to recover carbon monoxide overhead gas. The process achieves the rejection of hydrogen impurity in the second absorption and associated vaporization steps with minimum degradation of refrigeration temperature levels in the process and high recovery of carbon monoxide product.

Abstract: Radioactive krypton is separated from a gas mixture comprising nitrogen and traces of carbon dioxide and radioactive krypton by first selective adsorption and then cryogenic distillation of the prepurified gas against nitrogen liquid to produce krypton bottoms concentrate liquid, using the nitrogen gas from the distillation for two step purging of the adsorbent.

Abstract: Radioactive krypton is separated from a gas mixture comprising nitrogen and traces of carbon dioxide and radioactive krypton by first selective adsorption and then cryogenic distillation of the prepurified gas against nitrogen liquid to produce krypton bottoms concentrate liquid, using the nitrogen gas from the distillation for two step purging of the adsorbent.