Adsorptive process design for the separation of hexane isomers using zeolites

Luna-Triguero, Azahara; Gómez‐Álvarez, Paula; Calero, Sofı́a

doi:10.1039/c6cp08025a

Cited by 30 publications

(21 citation statements)

References 40 publications

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“…The successful separation of n-hexane from its branched isomers relies essentially on solubility-selectivity, as linear n-hexane can be selectively sorbed by the [Fe 3 (μ 3 -O)(COO) 6 ]-6FDA MOF, while sorption of branched isomers is sterically hindered. The sorption selectivity exhibited by the [Fe 3 (μ 3 -O)(COO) 6 ]-6FDA MOF is 20 times higher than that of other sorbents, such as ZIF-8, zeolite 5A and zeolite β (Luna-Triguero et al, 2017 ). Moreover, this smart MOF exhibits very stable sorption capacity and selectivity after several sorption-desorption cycles.…”

Section: Recent Advances and Future Directions In Osnmentioning

confidence: 96%

Advances in Organic Solvent Nanofiltration Rely on Physical Chemistry and Polymer Chemistry

Galizia

Bye

2018

Front. Chem.

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The vast majority of industrial chemical synthesis occurs in organic solution. Solute concentration and solvent recovery consume ~50% of the energy required to produce chemicals and pose problems that are as relevant as the synthesis process itself. Separation and purification processes often involve a phase change and, as such, they are highly energy-intensive. However, novel, energy-efficient technologies based on polymer membranes are emerging as a viable alternative to thermal processes. Despite organic solvent nanofiltration (OSN) could revolutionize the chemical, petrochemical, food and pharmaceutical industry, its development is still in its infancy for two reasons: (i) the lack of fundamental knowledge of elemental transport phenomena in OSN membranes, and (ii) the instability of traditional polymer materials in chemically challenging environments. While the latter issue has been partially solved, the former was not addressed at all. Moreover, the few data available about solute and solvent transport in OSN membranes are often interpreted using inappropriate theoretical tools, which contributes to the spread of misleading conclusions in the literature. In this review we provide the state of the art of organic solvent nanofiltration using polymeric membranes. First, theoretical models useful to interpret experimental data are discussed and some misleading conclusions commonly reported in the literature are highlighted. Then, currently available materials are reviewed. Finally, materials that could revolutionize OSN in the future are identified. Among the possible applications of OSN, isomers separation could open a new era in chemical engineering and polymer science in the years to come.

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Section: Recent Advances and Future Directions In Osnmentioning

confidence: 96%

Advances in Organic Solvent Nanofiltration Rely on Physical Chemistry and Polymer Chemistry

Galizia

Bye

2018

Front. Chem.

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“…Synthetic porous materials, such as zeolites, have also demonstrated an impressive level of molecular sieving capabilities for chemicals, allowing the separation of minor components from heterogeneous mixtures 5 . It is generally believed that the selectivity enabling such separations arises from the ability of molecules with smaller kinetic diameter (KD) to enter the pore while larger ones are excluded [6][7][8][9] .…”

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confidence: 99%

Selective filling of n-hexane in a tight nanopore

Rayabharam

et al. 2021

Nat Commun

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Molecular sieving may occur when two molecules compete for a nanopore. In nearly all known examples, the nanopore is larger than the molecule that selectively enters the pore. Here, we experimentally demonstrate the ability of single-wall carbon nanotubes with a van der Waals pore size of 0.42 nm to separate n-hexane from cyclohexane—despite the fact that both molecules have kinetic diameters larger than the rigid nanopore. This unexpected finding challenges our current understanding of nanopore selectivity and how molecules may enter a tight channel. Ab initio molecular dynamics simulations reveal that n-hexane molecules stretch by nearly 11.2% inside the nanotube pore. Although at a relatively low probability (28.5% overall), the stretched state of n-hexane does exist in the bulk solution, allowing the molecule to enter the tight pore even at room temperature. These insights open up opportunities to engineer nanopore selectivity based on the molecular degrees of freedom.

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“…Many available methods exist to separate hexane isomers in the petrochemical industry. [1,2] One of the most common techniques is the total isomerization process (TIP) from UOP. [3] In this process, the linear hydrocarbons are converted into branched hydrocarbons using the molecular sieve zeolite 5A.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Separation of n‐Hexane from 2,2‐Dimethyl Butane in Zeolite Y Using the Novel Levi–Blow Method

Nag

Yashonath

2021

Advcd Theory and Sims

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With stricter emission standards being implemented the world over, the increase in the research octane number (RON) is essential for continued use of fuel. This can only be achieved through the separation of the linear alkanes from the branched alkanes or through conversion of linear to branched isomer. A separation method based on levitation and blow torch effects has been recently shown to separate neopentane from n-pentane. The same method has been employed here to separate n-hexane from 2,2-dimethyl butane. This method provides a single step process in which the n-hexane can be removed completely. The method yields very high purity with minimum expenditure of energy. Several properties have been computed to quantify the separation and indicate the degree of separation. The method if implemented experimentally, will provide a generic method for the separation of molecular mixtures. The steps necessary to realize the method experimentally are discussed. The setup for scaling up of the separation using the levi-blow method for industries is also presented.

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Adsorptive process design for the separation of hexane isomers using zeolites

Cited by 30 publications

References 40 publications

Advances in Organic Solvent Nanofiltration Rely on Physical Chemistry and Polymer Chemistry

Advances in Organic Solvent Nanofiltration Rely on Physical Chemistry and Polymer Chemistry

Selective filling of n-hexane in a tight nanopore

Kinetic Separation of n‐Hexane from 2,2‐Dimethyl Butane in Zeolite Y Using the Novel Levi–Blow Method

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