In　this　study,　a　strategy　for　dichloromethane　(DCM)　capture　using　ionic　liquids　(ILs)　was　systematically　investigated　from　the　perspective　of　dynamic　analysis.　The　diffusion　coefficient,　Henry＇s　law　constant　(H),　saturated　absorption　capacity,　and　overall　volumetric　liquid-side　mass-transfer　coefficient　(K(L)a(o))　of　four　types　of　ILs　were　obtained.　Among　all　the　ILs　studied,　tetrabutylphosphonium　caproate　([P-4444][C5COO])　demonstrated　superior　DCM　absorption　capabilities,　and　its　corresponding　H　value　(3.13　Pa　m(3)/mol　at　25　degrees　C)　was　markedly　lower　than　those　of　solvents　documented　in　the　literature.　Furthermore,　its　K(L)a(o)　value　was　determined　to　be　2.77　x　10(-3)/s　at　25　degrees　C,　which　was　measured　in　a　customized　cylindrical　absorption　bottle　with　a　height　of　150　mm　and　an　inner　diameter　of　16　mm.　The　absorption　bottle,　fitted　with　a　gas　inlet　tube　having　an　inner　diameter　of　5　mm　and　positioned　5　mm　above　its　base,　utilized　a　simple　bubbling　technique　to　introduce　gas　into　the　liquid　phase,　eliminating　the　need　for　gas-dispersion　equipment.　Nevertheless,　ILs　with　high　affinities　showed　relatively　high　initial　mass-transfer　rates　for　DCM.　Based　on　molecular　dynamics　(MD)　simulations,　the　vapor-liquid　interface　properties,　including　mass　and　number　density　profiles,　molecular　orientation,　and　surface　tension,　were　investigated.　This　revealed　that　in　the　pure　[P-4444][C5COO]　system,　the　alkyl　chain　of　the　anion　was　oriented　toward　the　gas　phase,　while　the　carboxyl　group　was　oriented　toward　the　bulk.　The　tilt　angle　of　[C5COO](-)　with　respect　to　the　interface　was　within　the　range　of　37　degrees　＜　theta　＇　＜　70　degrees.　For　the　[P-4444][C5COO]/DCM　mixture,　at　the　interface,　the　anion　exhibits　an　enhanced　ordered　orientation,　while　the　cation　shows　a　more　disordered　orientation.