The invention discloses a
carbon dioxide phase change absorbent absorption
system and process, and belongs to the technical field of
carbon dioxide capture. The absorption
system comprises an absorption
tower internally provided with an absorption area and a
phase splitting area from top to bottom, a tube plate type
phase splitter assembly is arranged at the upper part of the
phase splitting area, and an accommodating space for accommodating a light phase and a heavy phase is arranged at the lower part of the
phase splitting area; the tube plate type
phase splitter assembly comprises a
liquid phase distributor, a baffling tube plate, a liquid collecting tank and a downcomer which are sequentially arranged in the phase splitting area from top to bottom; when the equivalent
diameter of the baffling tube plate is DN6-DN20, the baffling tube plate is subjected to
sand blasting treatment; when the equivalent
diameter of the baffle tube plate is DN20-DN50, the baffle tube plate is filled with a
polypropylene (PP) silk screen; after the
phase change absorbent absorbs
carbon dioxide and separates phases, the upper
liquid phase is a rich phase, the lower
liquid phase is a lean phase, the
density difference of the two phases is 0.03-0.05 g / cm < 3 >, and the
viscosity difference is 7-15 mPas. The invention further discloses a carbon dioxide
phase change absorbent absorption process adopting the
system. The method has excellent liquid-liquid separation and mixing performance, and is simple in process flow and low in equipment investment.