Separation of Oxygen Isotopic Water by Using a Pressure-Driven Air Gap Membrane Distillation
Separation of Oxygen Isotopic Water by Using a Pressure-Driven Air Gap Membrane Distillation
复制标题
DOI：
10.1021/ie900277r
复制
发表时间：
2009-06-03
影响因子：
4.2
通讯作者：
Choi, Yun-Young
中科院分区：
文献类型：
--
作者：
Kim, Jaewoo;Chang, Dae-Shik;Choi, Yun-Young
研究了使用新开发的压力驱动气隙膜蒸馏 (AGMD) 工艺分离氧同位素水，该工艺适用于多级 MD 系统。压力驱动 (PD) AGMD 与当前可用的 AGMD 的区别在于其渗透通量的产生。它使用蠕动泵在膜界面上产生压力梯度油。评估了四种不同疏水膜的渗透特性和同位素选择性。通过对收集的膜透过水进行称重来测定各种条件下的透过通量。 PD AGMD 的渗透通量比 AGMD 高 4.2 倍，而同位素选择性程度具有竞争力。使用可调谐二极管激光吸收光谱仪和同位素比质谱仪测量同位素比 (H2O)-O-18/(H2O)-O-16 来分析样品的氧同位素浓度。多级PD AGMD系统也成功构建并运行。
Separation of oxygen isotopic water using a newly developed pressure-driven air gap membrane distillation (AGMD) process that is applicable to a multistage MD system was investigated. Pressure-driven (PD) AGMD is distinguished from a currently available AGMD by way of its permeation flux generation. It uses a peristaltic pump to generate the pressure gradient oil the membrane interface. Permeation characteristics and isotopic selectivity of four different hydrophobic membranes were evaluated. Permeation fluxes under the various conditions were measured by weighing the collected membrane-permeated water. Permeation fluxes for PD AGMD were higher than those of AGMD as much as 4.2-fold whereas the degree of isotope selectivity was competitive. The oxygen isotopic concentrations of the samples were analyzed by measuring the isotopic ratio (H2O)-O-18/(H2O)-O-16 using tunable diode laser absorption spectroscopy and isotopic ratio mass spectrometer. A multistage PD AGMD system was also successfully constructed and operated.