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首页> 外文学位 >The ion exchange kinetics of cesium(+), strontinum hydroxide(+), and rubidium(+) on the hydrous crystalline silico-titanates, UOP IONSIV(TM) IE910 and UOP IONSIV(TM) IE911.
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The ion exchange kinetics of cesium(+), strontinum hydroxide(+), and rubidium(+) on the hydrous crystalline silico-titanates, UOP IONSIV(TM) IE910 and UOP IONSIV(TM) IE911.

机译：铯（+），氢氧化锶（+）和rub（+）在含水结晶硅钛酸盐，UOP IONSIVTM IE910和UOP IONSIVTM IE911上的离子交换动力学。

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UOP IONSIVTM IE911 and UOP IONSIVTM IE910 are novel hydrous crystalline silico-titanate ion exchangers. IONSIV TM IE911 is a 400 mum diameter granular material made by binding together the 0.2 mum diameter IONSIVTM IE910 crystals. IONSIV TM EB911 is considered an excellent ion exchange material for treating United States Department of Energy radioactive waste. However, before such a treatment technology can be developed, it is vital that the kinetics of ion exchange on these new materials be understood both qualitatively and quantitatively.; This research investigated the ion exchange kinetics of Cs+, SrOH+, and Rb+ on IE910 and IE911. A single solid phase resistance to diffusion was found to control the rate of ion exchange on IE910. Two resistances were found to contribute to the rate of ion exchange on IE911, a resistance to diffusion in the liquid filled pores between the crystals plus the solid phase resistance to diffusion inside the crystals. Mathematical models based on these mechanisms were written to simulate batch ion exchange experiments and the necessary diffusion coefficients were quantified by fitting these models to experimental data.; In addition, a quantitative criterion was developed to determine the relative importance of the two resistances for IE911. This criterion indicates that the pore resistance is dominant for Cs+ exchange and controlling for Rb+ exchange. The criterion also predicts that the pore resistance is dominant for SrOH+ exchange. Thus, the solid phase resistance can be neglected without introducing a large error. This simplification significantly eases the future modeling efforts required to design the waste treatment process.; Lastly, two concentration dependent forms of the IE910 solid phase diffusion coefficient were evaluated. Solid phase non-ideality considerations lead to the first form and solid phase electro-neutrality constraints lead to the second. Both forms yielded improved fits to experimental data over a constant solid phase diffusivity.
机译：UOP IONSIVTM IE911和UOP IONSIVTM IE910是新型含水结晶硅钛酸盐离子交换剂。 IONSIV TM IE911是通过将0.2微米直径的IONSIVTM IE910晶体粘合在一起而制成的400微米直径的颗粒材料。 IONSIV TM EB911被认为是用于处理美国能源部放射性废物的优秀离子交换材料。但是，在开发这种处理技术之前，至关重要的是要从定性和定量方面理解这些新材料上的离子交换动力学。这项研究调查了IE910和IE911上Cs +，SrOH +和Rb +的离子交换动力学。发现单一的固相扩散阻力可控制IE910上的离子交换速率。发现两个电阻有助于IE911上的离子交换速率，即对晶体之间充液孔中扩散的抵抗，以及对晶体内部扩散的固相抵抗。编写了基于这些机制的数学模型来模拟批量离子交换实验，并通过将这些模型拟合到实验数据中来量化必要的扩散系数。此外，开发了定量标准来确定IE911的两个电阻的相对重要性。该标准表明，孔阻力在Cs +交换中占主导地位，而在Rb +交换中占主导地位。该标准还预测，孔阻力是SrOH +交换的主导因素。因此，可以在不引入大误差的情况下忽略固相电阻。这种简化大大简化了设计废物处理过程所需的未来建模工作。最后，评估了两种浓度依赖性形式的IE910固相扩散系数。固相非理想性考虑导致第一种形式，而固相电中性约束导致第二种形式。在恒定的固相扩散率下，这两种形式均提高了对实验数据的拟合度。

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