One‐Step Ethylene Purification from Ternary Mixtures in a Metal–Organic Framework with Customized Pore Chemistry and Shape

Abstract

Adsorptive separation is an energy‐efficient technology for the separation of C2 hydrocarbons. However, it remains a critical problem to directly produce high‐purity C2H4 from ternary C2H2/C2H4/C2H6 mixtures by simultaneously trapping C2H2 and C2H6. Herein, we report the one‐step C2H4 purification from the ternary mixture by a metal–organic framework Zn(ad)(int) (ad=adeninate; int=isonicotinate). The material combines dense heterocyclic rings and accessible uncoordinated O atoms as strong binding sites for C2H6 and C2H2. Its spindle‐like cage exhibits an interesting shape matching with the targeted molecules, affording Zn(ad)(int) not only high separation selectivity for C2H6/C2H4 and C2H2/C2H4, but also excellent gas capacity. Breakthrough experiments show that polymer‐grade C2H4 can be separated from the ternary mixtures with a record productivity of 1.43 mmol g−1. In situ powder X‐ray diffraction and Fourier transform infrared spectrum analyses further provide deep insights into the separation mechanism.

Construction of membrane reactors coupled with conjugated network hollow microspheres for cascade production of block copolymers

“…In addition, the membrane reactor has inspired a scalable and sustainable approach toward chemical production and processing, offering unbridled potential for increasing reaction efficiency and addressing limitations in product purication. [19][20][21][22][23][24][25][26][27][28] Rationally designed membrane reactors may enable the production of new materials that are prohibitively difficult to obtain by other means. Integrating PET-RAFT processes into membrane reactors has provided crucial information concerning necessary reactor design and materials, catalytic capabilities, and accessible molecular weight ranges as well as highlighting the overall ability to improve the results of polymerization relative to their batch reactor counterparts.…”

The Adsorptive Separation of Ethylene from C2Hydrocarbons by Metal‐Organic Frameworks

“…[76] Copyright (2022), with American Association for the Advancement of Science. (1/10/89) mixtures in Zn(ad)(int) at 298 K. [77] Reproduced from Ref. [77] Copyright (2022), with Wiley-VCH.…”

Ultramicroporous Covalent Organic Framework Nanosheets with Functionality Pair for Membrane C2H2/C2H4 Separation

“…Ethene (C 2 H 4 ), an important chemical feedstock, is exceeding 201 Mtons annual production in 2020. [19] Industrial C 2 H 4 productions from processing petroleum (e.g. alkane dehydrogenation) usually generate ethyne (C 2 H 2 ) as a side product.…”