Mass transfer of COi into a H20 rich phase at high pressure in a capillary is studied • A rnethod for the determination of volumetric mass transfer coef ficient is presented.• A thermodynami c model and Raman spectroscopy are cou pied to obtain C(h con centrations.• The influen ce of flow rates on the volumetric mass transfer coefficient is studied.• The mass transfer coefficient varies along the length of the micro capillary tube.
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