NOVELTY - Swing adsorption process comprises contacting adsorbent bed with process feedstream at first pressure and temperature, adsorbing portion(s) of carbon dioxide in adsorbent bed, producing carbon dioxide-lean product stream, and producing carbon dioxide-rich product stream at second pressure and temperature. The absorbent bed comprises zeolitic imidazolate framework material. The process feedstream comprises carbon dioxide and methane. Each vertex of framework structure comprises single metal ion.    USE - Swing adsorption process for separating CO2 dioxide from process feedstream (claimed).    ADVANTAGE - The method provides improved separation of CO2 from process feedstream, and uses zeolitic imidazolate framework material having adsorptive loading ratio for CO2 over methane of greater than or equal to 10. The method lowers the required equipment size, cost, and operating expenses.    DETAILED DESCRIPTION - Swing adsorption process comprises contacting adsorbent bed with process feedstream at first pressure and temperature, adsorbing portion(s) of carbon dioxide (CO2) in adsorbent bed, producing CO2-lean product stream, and producing carbon dioxide-rich product stream at second pressure and temperature. The absorbent bed comprises zeolitic imidazolate framework material. The process feedstream comprises CO2 and methane. The CO2-lean product stream has lower concentration of CO2 by volume % than the process feedstream. The CO2-rich product stream has higher concentration of CO2 by volume % than the process feedstream. The zeolitic imidazolate framework material has framework structure. Each vertex of framework structure comprises single metal ion. Each pair of connected adjacent vertices of framework structure is linked by nitrogen atoms of an imidazolate anion or its derivative. The zeolitic imidazolate framework material has adsorptive loading ratio for CO2 over methane of greater than or equal to 10.    DESCRIPTION OF DRAWING(S) - The drawing shows a graph of carbon dioxide adsorption isotherm at 301 K for ZIF-7.