Ahn, Hyungwoong

Jun, Phillip

Lee, Chang-Ha

Yoon, Ki-Yong

The adsorption dynamics of activated carbon (AC) and carbon molecular sieve (CMS) beds were studied to recover ethylene from FCC fuel gas. In this study, the FCC fuel gas used consisted of six-component mixture (CH4/C2H4/C2H6/C3H6/N2/H2,32:15:14:2:12:25 vol.%). And the breakthrough experiments of adsorption and desorption were carried out. The breakthrough sequence in the AC bed was H2&lt;N2&lt;CH4&lt;C2H4&lt;C2H6 while the sequence in the CMS bed was H2&lt;CH4&lt;N2&lt;C2H6&lt;C2H4.The separation performance of the CMS bed during the adsorption step was lower than that of the AC bed. However, due to the characteristics of kinetic separation, the CMS bed could remove CH4/N2 as well asthe molecules that are larger than C2H6, which was not easy to be done by the AC bed.Since it was hard to regeneratethe adsorption bed by simple depressurization, vacuum regeneration should be adopted. As a result, the pressure vacuum swing adsorption (PVSA) process, consisting of CMS pretreatment process and AC main process, was suggestedto recover ethylene efficiently

Adsorption Dynamics of Activated Carbon and Carbon Molecular Sieve Beds for Ethylene Recovery

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