For　the　process　of　CO2　absorption,　existing　gas-liquid　contactors　suffer　from　low　mass　transfer　performance　and　low　gas-liquid　ratios.　In　this　study,　a　rotating　spiral　contactor　was　developed　to　overcome　these　drawbacks　and　a　novel　rate-based　model　was　developed　to　predict　the　CO2　absorption　performance.　The　effective　interfacial　area　(a(e)),　overall　volumetric　mass　transfer　coefficient　(K(G)a(e))　and　CO2　absorption　efficiency　(eta)　were　investigated.　The　results　showed　that　the　a(e)　was　913-1125　m(2)/m(3)　superior　to　the　conventional　contactor.　In　the　range　of　gas-liquid　ratio　of　200-1800,　the　K(G)a(e)　and　eta　were　1.4-10.1　kmol.m(-3).h(-1).kPa(-1)　and　40.5-99.6　%,　respectively.　The　rate-based　model　predicted　the　K(G)a(e)　and　eta　with　the　AARD　of　6.71　%　and　1.90　%,　respectively.　Also,　it　has　better　robustness　even　in　highly　nonlinear　temperature　and　composition　distributions.　This　study　provides　a　potential　contactor　and　a　new　modeling　tool　for　CO2　capture　and　other　gas-liquid　separation.