使用管中管膜接触器测量液体中气体溶解度的新方法,Chemical Engineering & Technology

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使用管中管膜接触器测量液体中气体溶解度的新方法
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2017-09-27 , DOI: 10.1002/ceat.201700196
Gaowei Wu ₁ , Enhong Cao ₁ , Simon Kuhn ₂ , Asterios Gavriilidis ₁

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有机溶剂中氧溶解度的数据对于催化有氧氧化的催化剂评估、反应器设计和工艺安全至关重要，催化有氧氧化是绿色化学中的一个新兴领域。开发了一种使用 Teflon AF-2400 管中管膜接触器的新方法，用于测量气体在有机溶剂中的溶解度。半透 Teflon AF-2400 膜可确保在特定压力和温度下连续流动的液体的气体饱和度。液体减压后，用气泡计测量脱气量并用于溶解度计算。在本研究中，该方法用于测量甲苯和苯甲醇中的氧溶解度。验证实验最初是通过将获得的氧在甲苯中的溶解度与文献数据进行比较来进行的。然后，在高达 10 bar 的压力和 298 – 393 K 的温度下测量了苯甲醇中的氧溶解度。观察到在 298 K（亨利定律常数，3462 bar）下苯甲醇中的氧溶解度约为甲苯中的氧溶解度（1057酒吧）。随着温度的升高，发现氧在苯甲醇中的溶解度增加，表明氧溶解过程是吸热的。最后，确定了作为温度函数的亨利定律常数的经验相关性。表明溶氧过程是吸热的。最后，确定了作为温度函数的亨利定律常数的经验相关性。表明溶氧过程是吸热的。最后，确定了作为温度函数的亨利定律常数的经验相关性。

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A Novel Approach for Measuring Gas Solubility in Liquids Using a Tube-in-Tube Membrane Contactor

Data on oxygen solubility in organic solvents are essential for catalyst evaluation, reactor design, and process safety of catalytic aerobic oxidations which is an emerging area in green chemistry. A novel approach using a Teflon AF-2400 tube-in-tube membrane contactor was developed for the measurement of gas solubility in organic solvents. The semi-permeable Teflon AF-2400 membrane ensures gas saturation of liquids in continuous-flow at specific pressure and temperature. After liquid decompression, the amount of gas outgassed was measured with a bubble meter and used for solubility calculation. In this study, this approach was demonstrated for the measurement of oxygen solubility in toluene and benzyl alcohol. Validation experiments were initially performed by comparing the obtained oxygen solubility in toluene with literature data. Then, oxygen solubility in benzyl alcohol was measured at pressures up to 10 bar and temperatures 298 – 393 K. Oxygen solubility in benzyl alcohol at 298 K (Henry's law constant, 3462 bar) was observed to be ~1/3 of that in toluene (1057 bar). With increasing temperature, the solubility of oxygen in benzyl alcohol was found to increase, indicating that the oxygen-dissolving process is endothermic. Finally, an empirical correlation of the Henry's law constant as a function of temperature was determined.

更新日期：2017-09-27

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