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Статті в журналах з теми "Cyclohexane Separation"

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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

Karpińska, M., M. Wlazło, D. Ramjugernath, P. Naidoo, and U. Domańska. "Assessment of certain ionic liquids for separation of binary mixtures based on gamma infinity data measurements." RSC Advances 7, no. 12 (2017): 7092–107. http://dx.doi.org/10.1039/c6ra25208g.

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Limiting activity coefficients for 64 solutes in [BzMIM][NTf₂] and [BzMIM][DCA], the gas–liquid partition coefficients, K_L, thermodynamic functions and selectivity for hexane/hex-1-ene, cyclohexane/cyclohexene and ethylbenzene/styrene separation were presented.

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2

Mohamad Azmi, Bustam-Khalil, Abdul Hannan Muhamad, Girma Gonfa, and Zakaria Man. "Benzene and Cyclohexane Separation Using 1-Propanenitrile-3-butylimidazolium Dicyanamide Ionic Liquid." Advanced Materials Research 879 (January 2014): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amr.879.58.

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Cyclohexane is mainly produced by catalytic hydrogenation of benzene, and the separation of unreacted benzene is very important process. However, the separation of benzene and cyclohexane mixture is one of the difficult separation processes in petrochemical industry. Presently, extractive distillation is commercially used to separate benzene and cyclohexane using molecular solvents. However, the current process suffers from process complexity and high-energy consumption. In this work, new ionic liquid, 1-propanenitrile-3-butylimidazolium dicyanamide was synthesized and applied for separation benzene and cyclohexane mixture. Some of the thermophysical properties of the ionic liquid were measured. The vapour- liquid equilibrium and relative volatility of the components were determined. The ionic liquid breaks the azeotropic mixture and increased the relative volatility of cyclohexane to benzene.

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3

Hong, Yun, Yanxiong Fang, Dalei Sun, and Xiantai Zhou. "Ionic liquids modified cobalt/ZSM-5 as a highly efficient catalyst for enhancing the selectivity towards KA oil in the aerobic oxidation of cyclohexane." Open Chemistry 17, no. 1 (August 21, 2019): 639–46. http://dx.doi.org/10.1515/chem-2019-0068.

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AbstractThe industrial oxidation of cyclohexane is currently performed with very low conversion level, i.e. 4-6% conversion and poor selectivity for cyclohexanone and cyclohexanol (K-A oil), i.e.70-85%, at above 150oC reaction temperature and above 10atm reaction pressure using molecular oxygen oxidant and homogeneous catalyst. Several disadvantages are, however, associated with the process, such as, complex catalyst-product separation, high power input, and low safe operation. Therefore, the oxidation of cyclohexane using heterogeneous catalyst oxygen oxidant from air at mild conditions has received particular attention. Aerobic oxidation of cyclohexane over ionic liquids modified cobalt/ZSM-5 (IL-Co/ZSM-5) in absence of solvents was developed in this article. The prepared catalysts were characterized by XRD, FT-IR, N2 adsorption-desorption, SEM, TEM and XPS analyses. The influence of reaction parameters on the oxidation of cyclohexane was researched, such as the various catalysts, reaction temperature, reaction time, and the reaction pressure, on the process. Highly selective synthesis of KA oil was performed by aerobic oxidation of cyclohexane using ionic liquids modified cobalt/ZSM-5 (IL-Co/ZSM-5) as the catalyst in absence of solvents for the first time. A selectivity of up to 93.6% of KA oil with 9.2% conversion of cyclohexane was produced at 150℃ and 1.5 MPa after 3 h, with about 0.1 mol cyclohexane, C7mimHSO4-Co/ZSM-5 catalyst equal to 6.0 wt%, respectively. The induction period of oxidation was greatly shortened when the ionic liquid was supported on ZSM-5. The catalyst was easy to centrifuge and was reused after five cycles. It was found that both the characterization and performance of the catalysts revealed that both the presence of oxygen vacancies with incorporation of Co ions into the framework of ZSM-5 and the introduction of C7mimHSO4 into the ZSM-5 leads to the both satisfactory selectivity and robust stability of the C7mimHSO4-Co/ZSM-5 heterogeneous catalyst.

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4

Richard, Bradley, Mohammad Azmi Bustam, and Girma Gonfa. "Separation of Benzene and Cyclohexane with Mixed Solvent Using Extractive Distillation." Applied Mechanics and Materials 625 (September 2014): 578–81. http://dx.doi.org/10.4028/www.scientific.net/amm.625.578.

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Isothermal Vapour-liquid equilibrium for cyclohexane (1) + benzene (2) binary system, cyclohexane (1) + benzene (2) dimethylformamide (3) ternary system and cyclohexane (1) + benzene (2) dimethylformamide (3) + cosolvent (4) quaternary systems were obtained. The effects of cosolvents (diethyl glycol, dimethylsulfoxide, N-methylformamide) on the performance of dimethylformamide in benzene-cyclohexane separation were studied. The result shows the selected cosolvents suppress the effectiveness of dimethylformamide. The result also shows that the ratio of cosolvents to dimethylformamide affects the separation factor.

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5

Navarro, Pablo, Antonio Ovejero-Pérez, Miguel Ayuso, Noemí Delgado-Mellado, Marcos Larriba, Julián García, and Francisco Rodríguez. "Cyclohexane/cyclohexene separation by extractive distillation with cyano-based ionic liquids." Journal of Molecular Liquids 289 (September 2019): 111120. http://dx.doi.org/10.1016/j.molliq.2019.111120.

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6

Chen, Liangji, Hao Zhang, Yingxiang Ye, Zhen Yuan, Jiaqi Wang, Yisi Yang, Si Lin, Fahui Xiang, Shengchang Xiang та Zhangjing Zhang. "Microporous polycarbazole frameworks with large conjugated π systems for cyclohexane separation from cyclohexane-containing mixtures". New Journal of Chemistry 45, № 47 (2021): 22437–43. http://dx.doi.org/10.1039/d1nj04968b.

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7

Ding, Yanjun, Lukman O. Alimi, Basem Moosa, Carine Maaliki, Johan Jacquemin, Feihe Huang, and Niveen M. Khashab. "Selective adsorptive separation of cyclohexane over benzene using thienothiophene cages." Chemical Science 12, no. 14 (2021): 5315–18. http://dx.doi.org/10.1039/d1sc00440a.

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8

Hadj-Kali, Mohamed K., M. Zulhaziman M. Salleh, Irfan Wazeer, Ahmad Alhadid, and Sarwono Mulyono. "Separation of Benzene and Cyclohexane Using Eutectic Solvents with Aromatic Structure." Molecules 27, no. 13 (June 23, 2022): 4041. http://dx.doi.org/10.3390/molecules27134041.

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The separation of benzene and cyclohexane is a challenging process in the petrochemical industry, mainly because of their close boiling points. Extractive separation of the benzene-cyclohexane mixture has been shown to be feasible, but it is important to find solvents with good extractive performance. In this work, 23 eutectic solvents (ESs) containing aromatic components were screened using the predictive COSMO-RS and their respective performance was compared with other solvents. The screening results were validated with experimental work in which the liquid–liquid equilibria of the three preselected ESs were studied with benzene and cyclohexane at 298.5 K and 101.325 kPa, with benzene concentrations in the feed ranging from 10 to 60 wt%. The performance of the ESs studied was compared with organic solvents, ionic liquids, and other ESs reported in the literature. This work demonstrates the potential for improved extractive separation of the benzene-cyclohexane mixture by using ESs with aromatic moieties.

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9

Okushita, H. "Synthesis of polyoxyethylene grafting nylon 6 and the selective separation of cyclohexane/cyclohexanone/cyclohexanol mixture through its membranes." Journal of Membrane Science 112, no. 1 (April 3, 1996): 91–100. http://dx.doi.org/10.1016/0376-7388(95)00280-4.

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10

Shen, J. N., L. G. Wu, H. L. Chen, and C. J. Gao. "Separation cyclohexene/cyclohexane mixtures with facilitated transport membrane of poly(vinyl alcohol)–Co2+." Separation and Purification Technology 45, no. 2 (October 2005): 103–8. http://dx.doi.org/10.1016/j.seppur.2005.02.013.

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11

Yi, Chun-Cheng, and I.-Lung Chien. "Control Study to Enhance the Controllability of Heterogeneous Extractive Distillation: Cyclohexane/Cyclohexene Separation." Industrial & Engineering Chemistry Research 58, no. 8 (February 6, 2019): 3211–24. http://dx.doi.org/10.1021/acs.iecr.9b00341.

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12

Yao, Huan, Yu‐Mei Wang, Mao Quan, M. Umar Farooq, Liu‐Pan Yang, and Wei Jiang. "Adsorptive Separation of Benzene, Cyclohexene, and Cyclohexane by Amorphous Nonporous Amide Naphthotube Solids." Angewandte Chemie 132, no. 45 (August 31, 2020): 20117–22. http://dx.doi.org/10.1002/ange.202009436.

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13

Yao, Huan, Yu‐Mei Wang, Mao Quan, M. Umar Farooq, Liu‐Pan Yang, and Wei Jiang. "Adsorptive Separation of Benzene, Cyclohexene, and Cyclohexane by Amorphous Nonporous Amide Naphthotube Solids." Angewandte Chemie International Edition 59, no. 45 (August 31, 2020): 19945–50. http://dx.doi.org/10.1002/anie.202009436.

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14

Frolkova, A. V., M. S. Peshekhontseva, and I. S. Gaganov. "SHARP DISTILLATION FOR QUATERNARY SYSTEMS." Fine Chemical Technologies 13, no. 3 (June 28, 2018): 41–48. http://dx.doi.org/10.32362/24106593-2018-13-3-41-48.

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Conditions of sharp distillation were considered for zeotropic quaternary system (two pairs of components are characterized by relative volatility close to 1) and systems with one (with minimum or maximum boiling point) and two (with minimum and maximum boiling point) binary azeotropes. Regions of compositions for which sharp distillation is effective (distillate and bottom flows don't contain common components) were determined on the basis of analyzing diagrams of unit manifolds of distribution coefficients (distribution coefficients of two components are higher than one, and those of another two components - lower than one). This kind of separation can be recommended if it doesn’t cause an increase in the number of apparatuses in the separation flowsheet. If the system contains azeotropes of saddle type that can generate separatric manifolds, the possibility and expedience of sharp separation decreases. The conclusions were confirmed by simulation of the distillation process in AspenPlus V.10.0 for real and industrially important quaternary systems: ethyl acetate - benzene - toluene - butyl acetate; acetone - methanol - ethanol - propanol-2; methyl acetate - methanol - acetic acid - acetic anhydride and cyclohexene - cyclohexane - cyclohexanone - phenol. Mathematical modeling was carried out using local compositions models Wilson and NRTL-HOC. The relative error of vapor-liquid equilibrium description is less than 4%. The vapor-liquid equilibrium was simulated, a phase diagram was constructed and analyzed, the parameters of sharp distillation column operation (the number of stages, the feed-stage and reflux ratio) were determined for all systems. The effectiveness of using sharp distillation for the system with phenol was confirmed for a wide range of compositions.

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15

Huh, Hoon, Ji Won Rhim, Ji Soon Park, and Sang Yong Nam. "Petroleum Separation through Polymer Blend Membranes Using Pervaporation." Materials Science Forum 486-487 (June 2005): 432–35. http://dx.doi.org/10.4028/www.scientific.net/msf.486-487.432.

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Utilization of membrane offers the promise of huge energy savings if successfully applied to petroleum separations. Membranes are bound to enter into refining petroleum operations involving liquid separations once appropriate materials and modules are developed. Hybrid processes such as utilizing membrane modules to azeotropes formed during distillation are particularly attractive because they can offer less process complexity and reduced capital investment. A pervaporation performance was studied using pervaporation through the polymer blendmembranes for the separation of benzene and cyclohexane mixtures to investigate the relationship between pervaporation performance and polymer blend design. Solubility parameter calculation and thermodynamic calculation were used to predict the pervaporation performance for the benzene and cyclohexane mixture system using polymeric blend membrane composed of NBR, PVC and polar copolymers with various solubility parameters. The solubility parameter of the polymer blend membranes were controlled with different blend ratio. Screening of the membranes was accomplished by simple swelling experiments. Selectivity for the polar component increased with increasing NBR and PVC contents. Solubility parameter from polar and hydrogen bonding properties and activity calculated from thermodynamic model predicted the trend of swelling characteristics and pervaporation performance. Solubility parameter and thermodynamic calculation provide an a priori methodology for seeking the best blend formulations.

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16

Sebyakin, A. Yu, and A. K. Frolkova. "THE RELATIONSHIP BETWEEN THE STRUCTURE OF PHASE EQUILIBRIUM DIAGRAM AND THE STRUCTURE OF FLOWSHEET DIAGRAMS OF MULTIPHASE QUATERNARY MIXTURES SEPARATION." Fine Chemical Technologies 11, no. 4 (August 28, 2016): 5–14. http://dx.doi.org/10.32362/2410-6593-2016-11-4-4-14.

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In this work the structures of phase equilibrium diagrams of multiphase four-component systems n-hexane (n-heptane, n-octane) - cyclohexane - furfural - water were investigated. The systems are characterized by the existence of areas of three-phase separation. On the basis of the obtained data the synthesis of feasible variants of separation schemes was carried out, rational modes of functioning of each column were found, the energetically favorable variant was chosen. It was found that the use of preliminary phase separation in systems with n-hexane and n-octane is power-efficient, and the profit in case of the octane system (equimolar mixture) in comparison with the application of the first predetermined separation at the first stage is more than 25%. Certain difficulties (the high values of columns effectiveness: 60 and 40 theoretical plates) upon the separation of the hexane and heptane systems are due to the similar volatilities of n-hexane (n-heptane) and cyclohexane in the vicinity of the point of pure alkane.

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17

Sapianik, Aleksandr A., Konstantin A. Kovalenko, Denis G. Samsonenko, Marina O. Barsukova, Danil N. Dybtsev, and Vladimir P. Fedin. "Exceptionally effective benzene/cyclohexane separation using a nitro-decorated metal–organic framework." Chemical Communications 56, no. 59 (2020): 8241–44. http://dx.doi.org/10.1039/d0cc03227a.

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18

Wu, Li Guang, Yu Fei Chen, Yang Rong, Ting Wang, and Yu Xing Wang. "Preparation of Multi-Walled Carbon Nanotubes (MWNTs)/Polymethyl Methacrylate (PMMA) Hybrid Membranes and their Sorption Performance of Benzene/Cyclohexane." Advanced Materials Research 740 (August 2013): 550–54. http://dx.doi.org/10.4028/www.scientific.net/amr.740.550.

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Novel organic-inorganic hybrid membranes of polymethyl methacrylate (PMMA) containing multi-walled carbon nanotubes (MWNTs) were successfully prepared. Then, the swelling adsorption experiments of benzene/cyclohexane mixtures were employed to evaluate the performance of these membranes. Via transmission electron microscopy (TEM), Fourier transform infrared spectrophotometry (FTIR), the effect of surface modification on the morphology and properties of carbon nanotubes and hybrid membranes were studied. The results indicated that the separation performance for benzene/cyclohexane of the hybrid membranes depended on both the polarity of carbon nanotubes and the distribution of MWNTs in PMMA. Because the dispersion of MWNTs were obviously improved after acidification and ammonization modification, the hybrid membranes including modified MWNTs showed higher performance than membranes with un-modified MWNTs. In addition, a large number of polar group were introduced in the MWNTs during modification of acidification and ammonization, which depressed obviously the physical adsorption of cyclohexane by MWNTs. Therefore, these two changes in the properties of MWNTs both improved the separation performance of hybrid membranes.

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19

Frolkova, Anastasia V., Alla K. Frolkova, and Ivan S. Gaganov. "Comparison of Extractive and Heteroazeotropic Distillation of High-Boiling Aqueous Mixtures." ChemEngineering 6, no. 5 (October 19, 2022): 83. http://dx.doi.org/10.3390/chemengineering6050083.

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The processes of extractive distillation and heteroazeotropic distillation of mixtures containing water and a high-boiling component (propionic acid, acetic acid, 1-methoxy-2-propanol) are compared. Entrainers declared in the literature as effective agents for these processes were selected as separating agents. A distillation process simulation in AspenPlus V.11.0 is made. Parametric optimization is carried out and the column operation parameters (number of stages, feed stage, reflux ratio) that meet the minimum energy consumptions and ensure the production of marketable substances are determined. It is shown that the process of heteroazeotropic distillation is more energy-efficient compared to extractive distillation by more than 50%, due to the introduction of an entrainer that lowers the boiling point of process. In addition, in some cases (acetic acid + water with vinyl acetate, propionic acid + water with hexane, cyclohexane, cyclohexanol), one of the columns in the separation flowsheet can be abandoned due to the significantly limited mutual solubility.

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20

El blidi, Lahssen, Mohamed K. Hadj-Kali, Abdullah M. Al-Anazi, Saeed M. Alhawtali, and Irfan Wazeer. "Liquid-liquid separation of n-hexane/1-hexene and cyclohexane/cyclohexene using deep eutectic solvents." Journal of Molecular Liquids 344 (December 2021): 117776. http://dx.doi.org/10.1016/j.molliq.2021.117776.

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21

Yi, Chun-Cheng, Wen-Chi Huang, and I.-Lung Chien. "Energy-efficient heterogeneous extractive distillation system for the separation of close-boiling cyclohexane/cyclohexene mixture." Journal of the Taiwan Institute of Chemical Engineers 87 (June 2018): 26–35. http://dx.doi.org/10.1016/j.jtice.2018.03.042.

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22

Delgado-Mellado, Noemí, Antonio Ovejero-Perez, Pablo Navarro, Marcos Larriba, Miguel Ayuso, Julián García, and Francisco Rodríguez. "Imidazolium and pyridinium-based ionic liquids for the cyclohexane/cyclohexene separation by liquid-liquid extraction." Journal of Chemical Thermodynamics 131 (April 2019): 340–46. http://dx.doi.org/10.1016/j.jct.2018.11.018.

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23

Domańska, Urszula, Monika Karpińska, and Michał Wlazło. "Separation of hex-1-ene/hexane and cyclohexene/cyclohexane compounds with [EMIM]-based ionic liquids." Fluid Phase Equilibria 427 (November 2016): 421–28. http://dx.doi.org/10.1016/j.fluid.2016.08.008.

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24

Wang, Ting, Li Guang Wu, and Zeng Jiang. "Synthesis of AgCl Nanoparticles in W/O Microemulsion and Study of AgCl/Poly(GMA-co-MMA-co-AMPS) Copolymer Organic-Inorganic Hybrid Membranes." Applied Mechanics and Materials 328 (June 2013): 719–23. http://dx.doi.org/10.4028/www.scientific.net/amm.328.719.

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AgCl Nanoparticles were synthesized in the W/O microemulsion using 2-acrylamido-2-methyl propane sulfonic acid as a surfactant, glycidyl methacrylate (GMA)/ methacrylate (MMA) mixtures as an oil phase. Then, AgCl/poly (GMA-MMA-AMPS) copolymer organic-inorganic hybrid membranes were prepared by in-situ microemulsion polymerization for separation of benzene/cyclohexane mixture. The effect of concentration of surfactant (CAMPS) and salt (NaCl and AgNO3) on the morphology of AgCl nanoparticles was studied by TEM. The results showed that the sizes of AgCl nanoparticles increased with salt concentration. AgCl nanoparticles maintained well dispersion in AgCl/poly (GMA-MMA-AMPS) copolymer organic-inorganic hybrid membranes. The hybrid membrane demonstrated good separation performance for benzene/cyclohexane mixtures.

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25

Yan, Jun, Haiyu Sun, Qilin Wang, Lu Lu, Biao Zhang, Zhonggang Wang, Shengwei Guo, and Fenglan Han. "Covalent triazine frameworks for the dynamic adsorption/separation of benzene/cyclohexane mixtures." New Journal of Chemistry 46, no. 16 (2022): 7580–87. http://dx.doi.org/10.1039/d2nj00727d.

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26

Hřebabecký, Hubert, Milena Masojídková, and Antonín Holý. "Synthesis of Purine Nucleoside Analogues Derived from Carbocyclic 5-C-(Hydroxymethyl)hexopyranoses." Collection of Czechoslovak Chemical Communications 69, no. 2 (2004): 435–52. http://dx.doi.org/10.1135/cccc20040435.

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(1R,2R,3R,4S)-3-(Benzyloxy)-5,5-bis(hydroxymethyl)cyclohexane-1,2,4-triol (1) was converted to (3aS,4R,5S,7aR)-4-(benzyloxy)-2-oxo-6,6-bis[(trityloxy)methyl]hexahydro-2λ4-1,3,2-benzodioxathiol-5-ol (3) and subsequently to (3aS,4R,5S,7aR)-4-(benzyloxy)-2,2-dioxo-6,6-bis[(trityloxy)methyl]hexahydro-2λ4-1,3,2-benzodioxathiol-5-yl benzoate (4). Treatment of sulfate 4 with adenine and DBU afforded, after deprotection, 7 and 22 in low yields. Reaction of sulfite 3 with lithium azide gave (1R,2R,3S,6S)-6-azido-2-(benzyloxy)-4,4-bis[(trityloxy)methyl]-cyclohexane-1,3-diol (10) and (1S,4R,5S,6S)-5-azido-6-(benzyloxy)-2,2-bis[(trityloxy)methyl]-cyclohexane-1,4-diol (11) which were, after separation, reduced with LAH to (1R,2R,3S,6S)-6-amino-2-(benzyloxy)-4,4-bis[(trityloxy)methyl]cyclohexane-1,3-diol (9) and (1S,4R,5S,6S)-5-amino-6-(benzyloxy)-2,2-bis[(trityloxy)methyl]cyclohexane-1,4-diol (12). Amino derivatives 9 and 12 were transformed to (1R,2R,3S,6S)-6-(6-amino-9H-purin-9-yl)-4,4-bis(hydroxymethyl)cyclohexane-1,2,3-triol (7), (1R,2R,3S,6S)-6-[6-(cyclopropylamino)-9H-purin-9-yl]-4,4- bis(hydroxymethyl)cyclohexane-1,2,3-triol (16), (1S,2S,3S,4R)-3-[6-(cyclopropylamino)-9H-purin-9-yl]-6,6-bis(hydroxymethyl)cyclohexane-1,2,4-triol (20), (1S,2S,3S,4R)-3-(6-amino-9H-purin-9-yl)-6,6-bis(hydroxymethyl)cyclohexane-1,2,4-triol (22), and 2-amino-9-[(1S,2R,3R,4S)- 2,3,4-trihydroxy-5,5-bis(hydroxymethyl)cyclohexyl]-9H-purin-6(1H)-one (27).

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27

Tong, Zhen, Yoshiyuki Einaga, and Hiroshi Fujita. "Separation factor study of model polystyrene mixtures in cyclohexane." Macromolecules 18, no. 11 (November 1985): 2264–68. http://dx.doi.org/10.1021/ma00153a035.

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28

Shiau, Lie-Ding, and Chia-Chen Yu. "Separation of the benzene/cyclohexane mixture by stripping crystallization." Separation and Purification Technology 66, no. 2 (April 2009): 422–26. http://dx.doi.org/10.1016/j.seppur.2008.12.025.

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29

Yin, Wang, Shaohua Ding, Shuqian Xia, Peisheng Ma, Xiaojuan Huang, and Zhansheng Zhu. "Cosolvent Selection for Benzene−Cyclohexane Separation in Extractive Distillation." Journal of Chemical & Engineering Data 55, no. 9 (September 9, 2010): 3274–77. http://dx.doi.org/10.1021/je100081v.

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30

Vega, Aurelio, Fernando Díez, Ricardo Esteban, and José Coca. "Solvent Selection for Cyclohexane−Cyclohexene−Benzene Separation by Extractive Distillation Using Non-Steady-State Gas Chromatography." Industrial & Engineering Chemistry Research 36, no. 3 (March 1997): 803–7. http://dx.doi.org/10.1021/ie960426f.

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31

Karpińska, Monika, Michał Wlazło, and Urszula Domańska. "Liquid-liquid separation of hex-1-ene from hexane and cyclohexene from cyclohexane with ionic liquids." Journal of Chemical Thermodynamics 108 (May 2017): 127–35. http://dx.doi.org/10.1016/j.jct.2017.01.013.

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32

Karpińska, Monika, Michał Wlazło, Maciej Zawadzki, and Urszula Domańska. "Liquid-liquid separation of hexane/hex-1-ene and cyclohexane/cyclohexene by dicyanamide-based ionic liquids." Journal of Chemical Thermodynamics 116 (January 2018): 299–308. http://dx.doi.org/10.1016/j.jct.2017.09.014.

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33

Chen, Sen, Yijian Li, Lifeng Yang, Xianming Zhang, Zhenglu Yang, Lin Zhou, Xili Cui, and Huabin Xing. "Anion-pillared porous materials with suitable pore size for the efficient discrimination of cyclohexene from cyclohexane." Separation and Purification Technology 302 (December 2022): 122095. http://dx.doi.org/10.1016/j.seppur.2022.122095.

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34

Bai, Fang, Chao Hua, and Jing Li. "Separation of Benzene-Cyclohexane Azeotropes Via Extractive Distillation Using Deep Eutectic Solvents as Entrainers." Processes 9, no. 2 (February 12, 2021): 336. http://dx.doi.org/10.3390/pr9020336.

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Анотація:

The separation of benzene and cyclohexane azeotrope is one of the most challenging processes in the petrochemical industry. In this paper, deep eutectic solvents (DES) were used as solvents for the separation of benzene and cyclohexane. DES1 (1:2 mix of tetrabutylammonium bromide (TBAB) and levulinic acid (LA)), DES2 (1:2 mix of TBAB and ethylene glycol (EG)) and DES3 (1:2 mix of ChCl (choline chloride) and LA) were used as entrainers, and vapor-liquid equilibrium (VLE) measurements at atmospheric pressure revealed that a DES comprised of a 2:1 ratio of LA and TBAB could break this azeotrope with relative volatility (αij) up to 4.763. Correlation index suggested that the NRTL modelling approach fitted the experimental data very well. Mechanism of extractive distillation gained from FT-IR revealed that with hydrogen bonding and π–π bond interactions between levulinic acid and benzene could be responsible for the ability of this entrainer to break the azeotrope.

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35

Sakal, Salem A. "TERNARY LIQUID-LIQUID EQUILIBRIA FOR {BENZENE + CYCLOHEXANE + DIFFERENT IONIC LIQUIDS } at T= 298.2 K and P=1 atm: EFFECT OF CATION AND ANION ON SEPARATION PERFORMANCE." Scientific Journal of Applied Sciences of Sabratha University 1, no. 1 (December 27, 2018): 10–24. http://dx.doi.org/10.47891/sabujas.v1i1.10-24.

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Анотація:

Ionic liquids (ILs) based on imidazolium and pyridinium cations and differenttypes of anions containing transition metals were investigated for extraction of benzene from cyclohexane. The Liquid-liquid equilibrium (LLE) data are presented for six ternary systems of (Cyclohexane + Benzene + an ionic Liquid) at 298.15 K and atmospheric pressure. The ILs used in these systems are [Bmim][FeCl4], [Bmim][AlCl4], [Bmim][CuCl2], [BuPy][FeCl4]), [BuPy][AlCl4], and [C6Py][FeCl4] were all prepared in the lab. The influence of cation and anion structure of ILs on the separation selectivity and capacity for aliphatic/aromatic mixtures was analyzed. The results indicate that most ILs investigated shows both higher extractive selectivity and capacity for the aromatic components for the systems studied herein, suggesting they can be used as promising extracts for the separation of aliphatic/aromatic mixtures. The LLE data were well correlated by the non-random two-liquid (NRTL) model of non-electrolyte solutions with overall ARD deviation being about 0.0001 interm of the mole fraction based activity.

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36

Zahlan, Hala, Waseem Sharaf Saeed, Saad Alqahtani, and Taieb Aouak. "Separation of Benzene/Cyclohexane Mixtures by Pervaporation Using Poly (Ethylene-Co-Vinylalcohol) and Carbon Nanotube-Filled Poly (Vinyl Alcohol-Co-Ethylene) Membranes." Separations 7, no. 4 (November 30, 2020): 68. http://dx.doi.org/10.3390/separations7040068.

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Poly(ethylene-co-vinylalcohol) (E-VOH) and carbon nanotube-filled poly (vinyl alcohol-co-ethylene) (E-VOH/CNT) were used as membranes to separate benzene/cyclohexane mixtures by pervaporation technique. To reach this goal, E-VOH and E-VOH/CNT membranes were prepared by solvent casting method and characterized by differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The swelling tests were used to study the mass transfer of the benzene/cyclohexane mixture and their pure components. The separation by pervaporation process was carried out at 25 °C in which the effect of CNTs incorporated into E-VOH matrix and the initial concentration of benzene in the feed on the permeate flux, j, and separation factor, β, performance was investigated. The results obtained were very promising, in which the integration of CNTs through E-VOH chains increased the absorption area and raised the flux to 740 g/m2∙h. The separation factor increased to 9.03 and the pervaporation separation reached an index of 5942.2 g/m2∙h for the azeotropic mixture during 3 h of the separation process. In contrast, for the unfilled E-VOH membrane, it was found that these parameters were a rise of 280 g∙m−2∙h−1, separation factor of 12.90 and pervaporation separation index of 3332.0 g/m2∙h, under the same conditions. Likewise, the calculation of the performance of the E-VOH/CNT membrane with regard to that of the unfilled membrane indicated 2.64 for the total flux and 0.70 for the separation factor. It was also revealed that the best compromise of the filled membrane in terms of total cumulative flux and separation factor is obtained for the feed containing the azeotropic mixture.

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37

Niu, Feifan, Yuanmeng Liu, Xiaoning Wang, and Xunqiu Wang. "Separation of methylcyclopentane, cyclohexane and methylcyclohexane mixture by atmospheric distillation." Journal of Chemical Thermodynamics 161 (October 2021): 106535. http://dx.doi.org/10.1016/j.jct.2021.106535.

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38

Einaga, Yoshiyuki, Yo Nakamura, and Hiroshi Fujita. "Three-phase separation in cyclohexane solutions of binary polystyrene mixtures." Macromolecules 20, no. 5 (September 1987): 1083–87. http://dx.doi.org/10.1021/ma00171a035.

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39

Kusakabe, Katsuki, Seiki Yoneshige, and Shigeharu Morooka. "Separation of benzene/cyclohexane mixtures using polyurethane–silica hybrid membranes." Journal of Membrane Science 149, no. 1 (October 1998): 29–37. http://dx.doi.org/10.1016/s0376-7388(98)00185-9.

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40

Acharya, H. R., S. A. Stern, Z. Z. Liu, and I. Cabasso. "Separation of liquid benzene/cyclohexane mixtures by perstraction and pervaporation." Journal of Membrane Science 37, no. 3 (June 1988): 205–32. http://dx.doi.org/10.1016/s0376-7388(00)82430-8.

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41

Lyu, Zhaoxian, Teng Zhou, Lifang Chen, Yinmei Ye, Kai Sundmacher, and Zhiwen Qi. "Simulation based ionic liquid screening for benzene–cyclohexane extractive separation." Chemical Engineering Science 113 (July 2014): 45–53. http://dx.doi.org/10.1016/j.ces.2014.04.011.

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42

Yildirim, Ahmet E., Nilufer Durmaz Hilmioglu, and Sema Tulbentci. "Separation of benzene/cyclohexane mixtures by pervaporation using PEBA membranes." Desalination 219, no. 1-3 (January 2008): 14–25. http://dx.doi.org/10.1016/j.desal.2007.02.031.

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43

Shen, Jiang-nan, Xin-cun Zheng, Hui-min Ruan, Li-guang Wu, Jun-hong Qiu, and Cong-jie Gao. "Synthesis of AgCl/PMMA hybrid membranes and their sorption performance of cyclohexane/cyclohexene." Journal of Membrane Science 304, no. 1-2 (November 2007): 118–24. http://dx.doi.org/10.1016/j.memsci.2007.07.022.

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44

Mukherjee, Soumya, Biplab Manna, Aamod V. Desai, Yuefeng Yin, Rajamani Krishna, Ravichandar Babarao, and Sujit K. Ghosh. "Harnessing Lewis acidic open metal sites of metal–organic frameworks: the foremost route to achieve highly selective benzene sorption over cyclohexane." Chemical Communications 52, no. 53 (2016): 8215–18. http://dx.doi.org/10.1039/c6cc03015g.

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Анотація:

Based on the tactical utilization of the Lewis acidic open metal sites (OMS) functionality; for an OMS-rich, microporous, water-stable series of metal–organic frameworks (M-MOF-74), vapor sorption based efficient selectivity for benzene over cyclohexane has been realized, crucial from industrial separation frontier.

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45

Schmeling, Nadine, Roman Konietzny, Daniel Sieffert, Patrick Rölling, and Claudia Staudt. "Functionalized copolyimide membranes for the separation of gaseous and liquid mixtures." Beilstein Journal of Organic Chemistry 6 (August 12, 2010): 789–800. http://dx.doi.org/10.3762/bjoc.6.86.

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Functionalized copolyimides continue to attract much attention as membrane materials because they can fulfill the demands for industrial applications. Thus not only good separation characteristics but also high temperature stability and chemical resistance are required. Furthermore, it is very important that membrane materials are resistant to plasticization since it has been shown that this phenomenon leads to a significant increase in permeability with a dramatic loss in selectivity. Plasticization effects occur with most polymer membranes at high CO2 concentrations and pressures, respectively. Plasticization effects are also observed with higher hydrocarbons such as propylene, propane, aromatics or sulfur containing aromatics. Unfortunately, these components are present in mixtures of high commercial relevance and can be separated economically by single membrane units or hybrid processes where conventional separation units are combined with membrane-based processes. In this paper the advantages of carboxy group containing 6FDA (4,4′-hexafluoroisopropylidene diphthalic anhydride) -copolyimides are discussed based on the experimental results for non cross-linked, ionically and covalently cross-linked membrane materials with respect to the separation of olefins/paraffins, e.g. propylene/propane, aromatic/aliphatic separation e.g. benzene/cyclohexane as well as high pressure gas separations, e.g. CO2/CH4 mixtures. In addition, opportunities for implementing the membrane units in conventional separation processes are discussed.

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46

Kondo, Kei, Xiao-Pen Lee, Takeshi Kumazawa, Keizo Sato, Kanako Watanabe-Suzuki, Hiroshi Seno, and Osamu Suzuki. "Sensitive Determination of n-Hexane and Cyclohexane in Human Body Fluids by Capillary Gas Chromatography with Cryogenic Oven Trapping." Journal of AOAC INTERNATIONAL 84, no. 1 (January 1, 2001): 19–23. http://dx.doi.org/10.1093/jaoac/84.1.19.

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Abstract A sensitive method was developed for determination of n-hexane and cyclohexane in human body fluids by headspace capillary gas chromatography (GC) with cryogenic oven trapping. Whole blood and urine samples containing n-hexane and cyclohexane were heated in a 7.5 mL vial at 70°C for 15 min, and 5 mL of the headspace vapor was drawn into a glass syringe. All vapor was introduced through an injection port of a GC instrument in the splitless mode into an Rtx-Volatiles middle-bore capillary column at an oven temperature of −40°C for trapping volatile compounds. The oven temperature was programmed to 180°C for GC with flame ionization detection. These conditions gave sharp peaks for both n-hexane and cyclohexane, a good separation of each peak, and low background impurities for whole blood and urine. The extraction efficiencies of n-hexane and cyclohexane were 13.2–30.3% for whole blood and 12.7–20.7% for urine. The coefficients of within-day variation in terms of extraction efficiency of both compounds were 5.0–9.5% for whole blood and 3.8–10.8% for urine; those of day-to-day variationfor the compounds were not greater than 16.6%. The regression equations for n-hexane and cyclohexane showed good linearity in the range of 5–500 ng/0.5 mL for whole blood and urine. The detection limits (signal-to-noise ratio = 3) for both compounds were 1.2 and 0.5 ng/0.5 mL for whole blood and urine, respectively. The data on n-hexane or cyclohexane in rat blood after inhalation of each compound are also presented.

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47

Zhang, Pei, Xinchang Wang, Wei Xuan, Pixian Peng, Zhihao Li, Ruqiang Lu, Shuang Wu, Zhongqun Tian, and Xiaoyu Cao. "Chiral separation and characterization of triazatruxene-based face-rotating polyhedra: the role of non-covalent facial interactions." Chemical Communications 54, no. 37 (2018): 4685–88. http://dx.doi.org/10.1039/c8cc02049c.

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Анотація:

We constructed a series of novel chiral molecular face-rotating polyhedra (FRP) from two 10,15-dihydro-5H-diindolo[3,2-a:3′,2′-c]carbazole (triazatruxene) derivatives and trans-1,2-cyclohexane diamine.

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48

Taipabu, Muhammad Ikhsan, Felicia Januarlia Novita, Hao-Yeh Lee, and Renanto Handogo. "Improvement of Cyclohexene/Cyclohexane separation process design via chemical looping technology using reactive distillation and thermally coupled configurations." Chemical Engineering and Processing - Process Intensification 168 (November 2021): 108587. http://dx.doi.org/10.1016/j.cep.2021.108587.

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49

Domańska, Urszula, Michal Wlazło, Monika Karpińska, and Maciej Zawadzki. "Separation of binary mixtures hexane/hex-1-ene, cyclohexane/cyclohexene and ethylbenzene/styrene based on limiting activity coefficients." Journal of Chemical Thermodynamics 110 (July 2017): 227–36. http://dx.doi.org/10.1016/j.jct.2017.03.004.

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50

Sobanska, Anna W., and Jaroslaw Pyzowski. "Quantification of Sunscreen Ethylhexyl Triazone in Topical Skin-Care Products by Normal-Phase TLC/Densitometry." Scientific World Journal 2012 (2012): 1–6. http://dx.doi.org/10.1100/2012/807516.

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Ethylhexyl triazone (ET) was separated from other sunscreens such as avobenzone, octocrylene, octyl methoxycinnamate, and diethylamino hydroxybenzoyl hexyl benzoate and from parabens by normal-phase HPTLC on silica gel 60 as stationary phase. Two mobile phases were particularly effective: (A) cyclohexane-diethyl ether 1 : 1 (v/v) and (B) cyclohexane-diethyl ether-acetone 15 : 1 : 2 (v/v/v) since apart from ET analysis they facilitated separation and quantification of other sunscreens present in the formulations. Densitometric scanning was performed at 300 nm. Calibration curves for ET were nonlinear (second-degree polynomials), withR> 0.998. For both mobile phases limits of detection (LOD) were 0.03 and limits of quantification (LOQ) 0.1 μg spot−1. Both methods were validated.

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