用于丙烯和丙烷分离的表面筛分碳皮

Li-Ping Guo, Ru-Shuai Liu, Jianhao Qian, Guang-Ping Hao, Junjie Guo, Hengan Wu, Fengchao Wang, An-Hui Lu
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摘要

烯烃/石蜡混合物的吸附分离需要开发具有高选择性和高吸附能力的坚固吸附剂。在此,我们介绍了用于丙烯/丙烷分离的表面筛分碳吸附剂。厚度约为 5.0 nm 的表面筛分碳皮可通过以 3.6 Å 为中心的窄缝对丙烯进行选择性筛分。碳皮下面是一个以 4.9 Å 为中心的孔隙,因此丙烯吸附能力高达约 2.0 mmol g-1。这种碳结构很容易自组装成水稳定、坚固的单体,并具有高度相互连接的大孔,可实现高效的传质。这些结构优势共同促成了表面筛分碳在水中沸腾一周后仍具有很高的丙烯/丙烷分离性能。工艺模拟显示,使用该类吸附剂,可通过两床六步真空变速吸附工艺从等摩尔丙烯/丙烷混合物中获得纯度分别为 99.5% 和 99.9% 的丙烯,回收率分别为 82% 和 79%。烯烃-石蜡混合物的吸附分离需要开发具有高选择性和高吸附容量的坚固吸附剂。在此,作者开发了一种物理吸附剂,其表面筛分碳皮厚度为几纳米,具有以 3.6 Å 为中心的分子选择性孔隙,用于分离 C3H6 和 C3H8,并具有较高的动态选择性。
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Surface sieving carbon skins for propylene and propane separation
The adsorptive separation of olefin/paraffin mixtures requires the development of robust adsorbents with high selectivity and adsorption capacity. Here we introduce surface sieving carbon adsorbents for propylene/propane separations. The surface sieving carbon skins, with a thickness of approximately 5.0 nm, selectively sieve propylene through narrow slits centered at 3.6 Å. Underneath the carbon skin lies a pore reservoir centered at 4.9 Å, resulting in a high propylene adsorption capacity of ~2.0 mmol g−1. Such carbon structures readily self-assemble into water-stable and robust monoliths with highly interconnected macropores for efficient mass transfer. These structural advantages collectively contribute to the high propylene/propane separation performance of the surface sieving carbon even after boiling in water for a week. Process simulations reveal that, using this adsorbent class, 99.5% and 99.9% purity of propylene with the according recovery of 82% and 79% can be obtained from an equimolar propylene/propane mixture through a two-bed six-step vacuum swing adsorption process. The adsorptive separation of olefin–paraffin mixtures requires the development of robust adsorbents with high selectivity and adsorption capacity. Here the authors develop a physiosorbent featuring surface sieving carbon skins several nanometers in thickness, with molecular-selective pores centered at 3.6 Å, for separation of C3H6 and C3H8 with high dynamic selectivity.
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