溶存二酸化炭素の固定化 : 陽イオン交換樹脂のカチオン交換特性について
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Continuous promotion of CO_2 dissolution from the gas phase to the water phase is required for construction of a high-efficiency CO_2 withdrawal system using liquid absorbent. To fix CO_2 as CaCO_3 produced by reaction of calcium ions with CO_2 dissolved in water, cation-exchanger resins that can retain cations, such as calcium and magnesium ions, were examined. On four cation-exchanger resins (Amberlight series 200CT, IR200, IRC50, and IRC76) and combinations of these resins, the rates and capacities of the replacement of protons to calcium or of calcium to protons were determined as changes in proton and calcium concentrations measured with a pH meter and by high performance liquid chromatography. Strong cation-exchange resins (SCER) were superior to weak cation exchange resins (WCER) in exchange rate and capacity from protons to calcium on resins. In contrast, the properties of SCER were inferior to those of WCER in calcium to proton exchange. Resins consisting of a combination of SCER and WCER had average exchange rate and capacity from proton to calcium. However, the calcium to proton ion -exchange rates on the combined resins were faster than the average of the component resins. Furthermore, the ion -exchange capacities of the combined resins were greater than the average capacities. These results suggest that low-CO_2 solubility water is applicable as an adsorbent solution for high-efficiency CO_2 withdrawal systems to reduce the levels of CO_2 in the atmosphere using combined resins.
- 長岡工業高等専門学校の論文
- 2005-10-30
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