Separation of xylenes by enclathration

Nassimbeni, Luigi R.; Báthori, Nikoletta B.; Patel, Leena Desiree; Su, Hong; Weber, Edwin

doi:10.1039/c4cc05329j

Cited by 41 publications

(29 citation statements)

References 18 publications

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“…sql-1-Co-NCS therefore exhibits ad ifferent sorption mechanism than that observed in other OX-selective MOMs such as the MIL-53 family,which exhibit breathing from open (narrow-pore) to more open (largepore) structures. [24] Indeed, it is this clay-like behavior that enables the high adsorption capacity of sql-1-Co-NCS is related to the enclathration approach taken by Nassimbeni et al [7,25] It also means that there is little structural distortion in either the closed or open phases of sql-1-Co-NCS,w hich helps to explain its recyclability.…”

Section: Methodsmentioning

confidence: 98%

“…Recently, a supermolecular cage with intrinsic porosity reported by Cooper's group exhibits exceptionally high selectivity but it also suffers from low adsporption capacity . Nassimbeni and co‐workers have also reported inclusion compounds with high selectivity but low working capacity . Indeed, there is no physisorbent material which combines the desirable criteria (selectivity >5 and capacity >50 wt %) that would enable a paradigm shift towards physisorptive separation of C 8 aromatics.…”

Section: Figurementioning

confidence: 99%

“…[6] Nassimbeni and co-workers have also reported inclusion compounds with high selectivity but low working capacity. [7] Indeed, there is no physisorbent material which combines the desirable criteria (selectivity > 5and capacity > 50 wt %) that would enable aparadigm shift towards physisorptive separation of C 8 aromatics.…”

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confidence: 99%

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Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

et al. 2019

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Section: Methodsmentioning

confidence: 98%

Section: Figurementioning

confidence: 99%

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Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

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“…It was found that the inclusion of acetonitrile leads to a molecular arrangement allowing photodimerisation, whilst the methanol solvate hinders this. 23 In other studies, inclusion has been utilised to separate xylenes 24 showing a clear preference of one guest over another, 25 or to store volatile guests. 26,27 Inclusion complexes have recently become focus of attention to study the incorporated molecules, either in an unusual conformation, 28 or to obtain structural information of a hard to crystallise compound.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bio-Isosteric Replacement on the Formation of Templating Methanol and Acetonitrile Solvates in Lophines

Kitchen

Melvin

Najib

et al. 2016

Crystal Growth & Design

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Bio-isosteric replacement is a frequently used tool in medicinal chemistry. While the pharmacological activity is not influenced by the exchange of substituents, the solid-state characteristics and formation of different crystal forms may well be altered dramatically, jeopardizing the processability and safety of the drug compound. In this study we investigate a series of triphenylimidazole (TPI) derivatives as model compounds with the bio-isosteric exchange of only one halogen position (F, Cl, Br, I). Crystallization from two industrially used solvents (methanol and acetonitrile) reveals solvate formation of all TPIs, for which the basic hydrogen bonded motif does not change. The three-dimensional packing depends on the size of the substituent and changes from fluoroto chloro-and bromo-substitution but remains the same for the larger iodo-substituent. From acetonitrile, only F-TPI and Cl-TPI form an isomorphic channel solvate, which in both cases desolvates reversibly to an isomorphic crystal form. Due to the halogen atom lining of the channels, bromine and iodine are too large to generate a stable packing. This study illustrates the importance of understanding the influence of bio-isosteric substitution on the solid state, in order to best utilize this common tool.

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“…Ethylbenzene (EB) is mainly produced by alkylation of benzene with ethylene,b ecause it is extremely energy-intensive to isolate it by superfractionation with more than 300 theoretical plates. [7] Indeed, there is no physisorbent material which combines the desirable criteria (selectivity > 5and capacity > 50 wt %) that would enable aparadigm shift towards physisorptive separation of C 8 aromatics. 10-20 wt %) and selectivity (ca.…”

mentioning

confidence: 99%

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

et al. 2019

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Purification of the C 8 aromatics (xylenes and ethylbenzene) is particularly challenging because of their similar physical properties.I ti sa lso relevant because of their industrial utility.Physisorptive separation of C 8 aromatics has long been suggested as an energy efficient solution but no physisorbent has yet combined high selectivity (> 5) with high adsorption capacity (> 50 wt %). Now ac ounterintuitive approach to the adsorptive separation of o-xylene from other C 8 aromatics involves the study of aknownnonporous layered material, [Co(bipy) 2 (NCS) 2 ] n (sql-1-Co-NCS), whichc an reversibly switch to C 8 aromatics loaded phases with different switching pressures and kinetics,m anifesting benchmark oxylene selectivity (S OX/EB % 60) and high saturation capacity (> 80 wt %). Structural insight into the observed selectivity and capacity is gained by analysis of the crystal structures of C 8 aromatics loaded phases.The separation and purification of chemical feedstocks currently uses 10-15 %o fw orldwide energy production; traditional separation processes (for example,d istillation, drying, evaporation) account for more than 80 %o ft his energy. [1] Given that there will be ever-increasing demand for commodities in the coming decades,m ore energy-efficient purification technologies are urgently required for large-scale separation processes.O ne of the most challenging and important separations in this context involves xylene isomers and ethylbenzene,t he C 8 aromatics.T hese compounds are used for the industrial production of fibers,plastics,solvents, and fuel additives. [2] However,t heir similar sizes and boiling points make their separation difficult. Presently,h igherboiling ortho-xylene (OX) is the main component isolated by distillation with more than 150 theoretical plates,w hile meta-xylene (MX) and para-xylene (PX) are separated by (complexation-based) fractional crystallization and/or adsorption. Ethylbenzene (EB) is mainly produced by alkylation of benzene with ethylene,b ecause it is extremely energy-intensive to isolate it by superfractionation with more than 300 theoretical plates. [3] Although adsorption-based technology has been well studied for C 8 aromatics separa-tion, [4] widespread implementation is hindered by the capacity and selectivity limitations of the current generation of adsorbents.F or example,z eolites only offer moderate capacity (ca. 10-20 wt %) and selectivity (ca. 5), [5] overshadowing their advantages of low cost and ready availability.

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Separation of xylenes by enclathration

Cited by 41 publications

References 18 publications

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

Influence of Bio-Isosteric Replacement on the Formation of Templating Methanol and Acetonitrile Solvates in Lophines

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

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Separation of xylenes by enclathration

Cited by 41 publications

References 18 publications

Highly Selective, High‐Capacity Separation of o‐Xylene from C8 Aromatics by a Switching Adsorbent Layered Material

Highly Selective, High‐Capacity Separation of o‐Xylene from C8 Aromatics by a Switching Adsorbent Layered Material

Influence of Bio-Isosteric Replacement on the Formation of Templating Methanol and Acetonitrile Solvates in Lophines

Highly Selective, High‐Capacity Separation of o‐Xylene from C8 Aromatics by a Switching Adsorbent Layered Material

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Product

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Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material

Highly Selective, High‐Capacity Separation of o‐Xylene from C₈ Aromatics by a Switching Adsorbent Layered Material