“…The interesting point of this research was that the authors did not have a clear idea on industrial applications for this process and only projected that the separation of CO 2 from N 2 might be used "in order to recover carbon resources or to control CO 2 concentration in an artificial atmosphere." Sidhoum et al (1988) studied CO 2 /N 2 separation using cellulose acetate (CA) hollow fibers with dense skin on the outside. They compared separation efficiency with the high-pressure feed on the outside and the inside of the fibers and reported permeances of about 20, 3, and 0.8 GPUs 1 for CO 2 , N 2 , and O 2 , respectively.…”