Purification of Propylene and Ethylene by a Robust Metal–Organic Framework Mediated by Host–Guest Interactions

Abstract

Industrial purification of propylene and ethylene requires cryogenic distillation and selective hydrogenation over palladium catalysts to remove propane,e thane and/or trace amounts of acetylene.Here,wereport the excellent separation of equimolar mixtures of propylene/propane and ethylene/ ethane,and of a1/100 mixture of acetylene/ethylene by ahighly robust microporous material, MFM-520, under dynamic conditions.Insitu synchrotron single crystal X-raydiffraction, inelastic neutron scattering and analysis of adsorption thermodynamic parameters reveal that as eries of synergistic hostguest interactions involving hydrogen bonding and p•••p stacking interactions underpin the cooperative binding of alkenes within the pore.Notably,the optimal pore geometry of the material enables selective accommodation of acetylene.The practical potential of this porous material has been demonstrated by fabricating mixed-matrix membranes comprising MFM-520, Matrimid and PIM-1, and these exhibit not only ah igh permeability for propylene ( % 1984 Barrer), but also as eparation factor of 7.8 for an equimolar mixture of propylene/propane at 298 K.

Ultramicroporous material based parallel and extended paraffin nano-trap for benchmark olefin purification

“…Adsorptive separation technologies based on porous materials provide a feasible avenue to solve the dilemma, and the technologies show more attractive prospects with the continuous progress in tailor-made porous materials 7 – 14 . Olefin-selective adsorbents have been widely explored for olefin/paraffin separation with considerable achievements 15 – 24 . However, even the current benchmark molecular-sieving material with ideally infinite olefin/paraffin selectivity could only afford olefins with purity of 99.1% due to the inevitable coadoption of paraffins, and extra adsorption–desorption cycles are necessary for olefins to reach polymer-grade purity 17 .…”

Direct Visualization of Supramolecular Binding and Separation of Light Hydrocarbons in MFM-300(In)

“… 4 , 26 However, C 2 H 6 -selective adsorbents are far less common than C 2 H 4 -selective materials. 9 , 23 , 27 , 28 …”

Carbon-efficient conversion of natural gas and natural-gas condensates to chemical products and intermediate feedstocks via catalytic metal–organic framework (MOF) chemistry

“…83 In many cases the uniformity translates into atomically precise single-crystal X-ray diffraction (SCXRD) structures featuring subsequently grafted catalytic ions and clusters. 62,67,81,[84][85][86][87][88][89][90][91][92][93][94][95] In a few cases, SCXRD measurements reveal how a grafted catalyst evolves over the course of catalytic runs, or changes in response to catalytically relevant thermal or chemical pre-treatment; see Fig. 7.…”