The Study Of Polyacrylamide Adsorption Resin For Carbon Dioxide

In this thesis, the preparation of polyacrylamide resin and the CO₂adsorptioncapacity on the polyacrylamide adsorption resin were studied. Three differentcrosslinking degrees of macroporous polymethylacrylate （PMA） was synthesized byusing methacrylate as monomer, divinylbenzene as crosslinking agent via conventionalsuspension polymerization. Three different crosslinking degrees were5%,7%,9%. Thespherical macroporous N-substituted polyacrylamide adsorption resin （PAM） wasprepared via aminolysis reaction of the PMA with different quality ofdiethylenetriamine. The performance of the polyacrylamide resin was investigated.The polyacrylamide resin was synthesized by using good solvent1,2-dichloroethane and the non-good solvent heptanes as the mixed porogen. The effectof crosslinking degrees, the amount of porogen and the proportion of1,2-dichloroethane and heptanes on the resin exchange capacity were researched. Underthe optimum condition: the amount of porogen was60%, the proportion of1,2-dichloroethane and heptanes was1:2, the effect of crosslinking degree on resinstructure was studied. The effect of factors on the exchange capacity was investigatedby single factor and orthogonal experiments. The results showed that crosslinkingdegree had greater effect on resin exchange capacity. Exchange capacity decreased withthe increase of crosslinking degree. Crosslinking degree was5%, the maximum ofexchange capacity was up to5.43mmol/g. The best resin was selected: crosslinkingdegree was5%, the amount of porogen was60%, the proportion of1,2-dichloroethaneand heptanes was1:2. The effect of crosslinking degree on specific surface area and pore volumeindicated that surface area reduced and pore volume increased with the increase of crosslinkingdegree. Crosslinking degree had greater effect on pore volume than surface area.Under static adsorption condition, adsorption capacity were investigated. Theeffects of crosslinking degrees, temperature, the mass of aminating agent on adsorptioncapacity and adsorption rate and cyclic capacity were systemly studied. The resultsshowed that when the crosslinking degree was5%, the adsorbent had a much higheradsorption capacity of143.1mg CO₂/g at room temperature. With the amine numberincreased，CO₂adsorption capacity was also increased. The number of amino affectedadsorption capacity. The resin had good stability before124℃, by using thermal gravimetric analysis. Experiments results showed that the resin has good recyclingstability in the adsorption-desorption process.