-In this study, the fixed-bed adsorption of carbon dioxide and a carbon dioxide-nitrogen mixture on zeolite 13X was investigated. The adsorption equilibrium and breakthrough curves were determined at different temperatures -301-306 K, 323 K, 373 K and 423 K. A model based on the LDF approximation for the mass transfer, considering the energy and momentum balances, was used to describe the adsorption kinetics of carbon dioxide and a carbon dioxide-nitrogen mixture. The model acceptably reproduced all of the breakthrough curves and can be considered as adequate for designing a PSA cycle to separate carbon dioxidenitrogen mixtures.
RESUMOUm contêiner, com taxa de resfriamento controlada de 37ºC para temperaturas de 17 ou 5ºC, foi construído para resfriamento e conservação do sêmen suíno. Nele, a taxa de resfriamento inicial (de 37 para 17ºC) foi -0,16ºC/min até atingir a temperatura de 17ºC e -0,17ºC/min até 5ºC. No decorrer do resfriamento, quando da passagem pela temperatura do choque térmico (entre 17 e 8ºC), a taxa foi de -0,0049ºC/min. A temperatura no interior do contêiner manteve-se estável por 53,58 horas à temperatura de 17±1ºC, e por 43,32 horas à temperatura de 5±1ºC.
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