Carbon dioxide adsorbent exhibiting improved long-term adsorption performance and method of preparation thereof

摘要

The present invention relates to a CO ₂ adsorbent having improved amine structure for forming an amine linkage and forming a core / shell structure in a porous support to improve long-term adsorption / desorption performance as well as fluidity of particles and a method for producing the same. The carbon dioxide adsorbent is crosslinked by a crosslinking agent and has a layer containing an amine improved in structure so that irreversible side reaction such as formation of an element does not occur and the amount of carbon dioxide adsorption is kept excellent even during repeated reuse. Further, by introducing a metal salt additive into the interior of the porous support, the adsorption amount of carbon dioxide can be further improved by receiving hydrogen ions during the reaction of amine with carbon dioxide or by preventing deterioration due to irreversible reaction with acid gas have. Also, the amine structure crosslinked between amine groups is formed inside the porous support, so that the adsorption amount is maintained over a long period of time because the amine groups do not leach out and the adsorbent does not aggregate due to the leached amine. In the case of the crosslinked amine, the impregnation of the support into the support is difficult due to its high viscosity and molecular weight. However, the method for preparing the carbon dioxide adsorbent according to the present invention is characterized in that the amine is impregnated into the support before the crosslinking takes place, It has excellent impregnation rate. In addition, the crosslinking agent reacts with the primary amine of the impregnated amine material to reduce the ratio of the primary amine, thereby suppressing the side reaction of urea formation and maintaining high carbon dioxide adsorption ability.