Regularities in the retention of isomeric aromatic hydrocarbons in liquid chromatography. Part I. Analysis of polymethyl-and monoalkyl benzenes and polynuclear aromatic hydrocarbons on hydroxylated silica gel

Ageev, A. N.; Киселев, А. В.; Yashin, Ya. I.

doi:10.1007/bf02303435

Cited by 23 publications

(4 citation statements)

References 4 publications

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“…Nowadays, the advances achieved in this technology pass through the use of new materials as adsorbents because this process has already been studied and optimized to increase its performance and efficiency. 1−4 Currently, Faujasite-type zeolites are the adsorbents used in the Parex process; 5−10 however, other types of materials proved to be suitable in xylene isomer separation, such as silicates, 11 polymers, 12 carbon materials, 13 hydrotropes, 14 hydroxylated silica gel, 15,16 and more recently, metal−organic frameworks (MOFs). 17−24 MOFs are emerging as adsorbents in adsorptive separations, because they combine highly tunable crystalline structures and organic−inorganic compositions with large surface areas and pore volumes.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The benchmark for xylene isomer separation is the Parex process based on the simulated moving-bed technology. Nowadays, the advances achieved in this technology pass through the use of new materials as adsorbents because this process has already been studied and optimized to increase its performance and efficiency. − Currently, Faujasite-type zeolites are the adsorbents used in the Parex process; − however, other types of materials proved to be suitable in xylene isomer separation, such as silicates, polymers, carbon materials, hydrotropes, hydroxylated silica gel, , and more recently, metal–organic frameworks (MOFs). − …”

Section: Introductionmentioning

confidence: 99%

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Toward Understanding the Influence of Ethylbenzene in p-Xylene Selectivity of the Porous Titanium Amino Terephthalate MIL-125(Ti): Adsorption Equilibrium and Separation of Xylene Isomers

et al. 2012

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The potential of the porous crystalline titanium dicarboxylate MIL-125(Ti) in powder form was studied for the separation in liquid phase of xylene isomers and ethylbenzene (MIL stands for Materials from Institut Lavoisier). We report here a detailed experimental study consisting of binary and multi-component adsorption equilibrium of xylene isomers in MIL-125(Ti) powder at low (≤0.8 M) and bulk (≥0.8 M) concentrations. A series of multi-component breakthrough experiments was first performed using n-heptane as the eluent at 313 K, and the obtained selectivities were compared, followed by binary breakthrough experiments to determine the adsorption isotherms at 313 K, using n-heptane as the eluent. MIL-125(Ti) is a para-selective material suitable at low concentrations to separate p-xylene from the other xylene isomers. Pulse experiments indicate a separation factor of 1.3 for p-xylene over o-xylene and m-xylene, while breakthrough experiments using a diluted ternary mixture lead to selectivity values of 1.5 and 1.6 for p-xylene over m-xylene and o-xylene, respectively. Introduction of ethylbenzene in the mixture results however in a decrease of the selectivity.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward Understanding the Influence of Ethylbenzene in p-Xylene Selectivity of the Porous Titanium Amino Terephthalate MIL-125(Ti): Adsorption Equilibrium and Separation of Xylene Isomers

et al. 2012

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“…Two years before commercialization of ADS‐47, Cheng and Hurst at UOP filed a patent for the production of a binderless BaKX zeolitic adsorbent 34. Nevertheless, other types of materials proved to be suitable in xylene isomer separation, such as silicates 35, polymers 36, carbon materials 37, hydrotropes 38, hydroxylated silica gel 39, 40, and, more recently, metal‐organic frameworks (MOFs) 41–47.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Process for o‐ and p‐Xylene Production in Aromatics Plants

et al. 2014

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A new hybrid process for the production of o-and p-xylene is proposed to replace the traditional plant of aromatics in refineries. The proposed process comprises a simulated moving bed (SMB) unit and two crystallizers. The SMB technology as the first unit of the suggested process is applied for the separation of xylene isomers and was investigated by simulation of an industrial size unit, using experimentally measured adsorption equilibrium data on MIL-53(Al)-shaped material. The separation of p-xylene from o-xylene with m-xylene as desorbent is the key characteristic of this method. An industrial-scale SMB unit could provide extract and raffinate streams with very high purities.

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“…Presently, faujasite-type zeolites are the adsorbents in the Parex process, among which prehydrated KY, − BaKY, BaX, and BaKX , zeolites hold an important position. Zeolite KBaY is generally employed for this separation process, although other types of materials have been proven to be suitable in xylene isomers separation, such as silicates, polymers, carbon materials, hydrotropes, hydroxylated silica gel, , and, more recently, metal–organic frameworks (MOFs). ,− …”

Section: Introductionmentioning

confidence: 99%

Influence of the Eluent in the MIL-53(Al) Selectivity for Xylene Isomers Separation

Moreira

Santos

Ferreira

et al. 2011

Ind. Eng. Chem. Res.

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MetalÀorganic framework MIL-53(Al) pellets were tested for selective adsorption and separation of xylene isomers with the aim of studying the influence of the solvent used at bulk concentrations. In this way, a set of single and multicomponent pulse experiments to measure selectivities was conducted, with iso-octane, n-hexane, and n-heptane as eluents, at 313 K. In order to complete this study, multicomponent breakthrough experiments were also performed, under the same conditions, in the presence of these three eluents, and the obtained selectivities were compared. MIL-53(Al) presented a preference for o-xylene over m-xylene and p-xylene in all experiments. The selectivity was higher when n-heptane was the eluent. For the breakthrough experiments that used nheptane as the eluent, selectivities of 2.1 were obtained for o-xylene over m-xylene and over p-xylene. It was possible to conclude that the choice of eluent influences the adsorption selectivity and capacity of the adsorbent. This could result, among other factors, from the adsorbentÀadsorbate interactions. These interactions may also occur with the eluent molecules (as an adsorbate), which influences the adsorption capacity.

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Regularities in the retention of isomeric aromatic hydrocarbons in liquid chromatography. Part I. Analysis of polymethyl-and monoalkyl benzenes and polynuclear aromatic hydrocarbons on hydroxylated silica gel

Cited by 23 publications

References 4 publications

Toward Understanding the Influence of Ethylbenzene in p-Xylene Selectivity of the Porous Titanium Amino Terephthalate MIL-125(Ti): Adsorption Equilibrium and Separation of Xylene Isomers

Toward Understanding the Influence of Ethylbenzene in p-Xylene Selectivity of the Porous Titanium Amino Terephthalate MIL-125(Ti): Adsorption Equilibrium and Separation of Xylene Isomers

Hybrid Process for o‐ and p‐Xylene Production in Aromatics Plants

Influence of the Eluent in the MIL-53(Al) Selectivity for Xylene Isomers Separation

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