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Pyrolysis End-Doping to Optimize Transport Properties of Carbon Molecular Sieve Hollow Fiber Membranes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-07 , DOI: 10.1021/acs.iecr.0c02479
Manjeshwar G. Kamath 1 , Arun K. Itta 1 , Samuel S. Hays 1 , Oishi Sanyal 1 , Zhongyun Liu 1 , William J. Koros 1
Affiliation  

In this article, we present a facile approach, pyrolysis end-doping (PED), to finely tune pore structures to optimize separation properties of polyimide-derived asymmetric carbon molecular sieve (CMS) hollow fiber membranes. The PED approach creates CMS fibers with excellent transport properties using argon with 10 ppm oxygen for 1 min at the end of a conventional high-temperature pyrolysis process. The tuning capability is demonstrated for a membrane with a thin selective skin layer of about 1 μm thickness for already highly permeable 6FDA-DETDA:DABE polyimide-derived CMS membranes to improve the CO2/CH4 permselectivity. In the PED process, trace oxygen reacts primarily with the skin layer and underlying support transition layer of ultramicropores and micropores to achieve overall membrane separation property improvements for natural gas purification. The PED is a simple one-step process that is easier to implement than a previously published dual temperature secondary oxygen doping (DTSOD) process. The PED approach, therefore, adds a valuable and scalable new tool, ideally suited for fine-tuning of membrane properties.

中文翻译:

热解端掺杂优化碳分子筛中空纤维膜的传输性能

在本文中,我们提出了一种简便的方法,即热解末端掺杂(PED),以微调孔结构,以优化聚酰亚胺衍生的不对称碳分子筛(CMS)中空纤维膜的分离性能。PED方法在常规高温热解过程结束时,使用含10 ppm氧气的氩气持续1分钟,可以制造出具有优异传输性能的CMS纤维。对于具有高渗透性的6FDA-DETDA:DABE聚酰亚胺衍生CMS膜的具有高渗透性的6FDA-DETDA:DABE CMS膜,具有约1μm厚度的薄选择表皮膜的调谐能力得到了证明,可以改善CO 2 / CH 4选择性。在PED工艺中,微量氧主要与超微孔和微孔的表层和下面的支撑过渡层反应,从而实现整体膜分离性能的改善,以净化天然气。PED是一个简单的一步式过程,比以前发布的双温度二次氧掺杂(DTSOD)过程更易于实现。因此,PED方法增加了一种有价值的且可扩展的新工具,非常适合微调膜的性能。
更新日期:2020-07-29
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