Solubility and dissolution mechanism of 4-chlorotoluene in subcritical water investigated in a fused silica capillary reactor by in situ Raman spectroscopy

Bei, Ke; ChuanYong, Zhang; Wang, Junliang; Li, Kai; Lyu, Jinghui; Zhao, Jia; Chen, Jie; Chou, I‐Ming; Pan, Zhiyan

doi:10.1016/j.fluid.2016.05.018

Cited by 13 publications

(10 citation statements)

References 44 publications

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“…The vibrational spectroscopy has been contributing largely in many fields of materials science because of its versatility of non-destructive sampling methods 1 . Raman spectroscopy is a technique which has been broadly used to characterize diamond-like carbon (DLC) films, graphite and graphene films [2][3][4][5][6][7][8] . It has also been applied to detect stress in semiconductor films like Si and SiC, in ZrO and Cr 2 O 3 films which are oxidized at high temperatures and also carbon and bio tissue materials 9 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Carbon thin Films Using Raman Spectroscopy

et al. 2018

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Carbon thin films deposited by the magnetron sputtering technique were evaluated by Raman spectroscopy to study the influence on their crystallinity caused by different parameters like the carbon deposition time, the different buffer-layers and substrates employed and also two distinct heat treatments. The present results showed that the choice of these parameters plays an important role in the production of these films. The results also indicate the possibility of using the technique for the production of carbon thin films to be employed in future in applications with controlled content of structural defects, predominance of ordered sp 2 bondings and tendency of graphitization.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Carbon thin Films Using Raman Spectroscopy

et al. 2018

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“…Then, the FSCR was loaded into the heating/cooling stage (INS0908051, INSTEC, USA); the sample temperature was increased at a rate of 5 °C/min from room temperature to 240 °C and at 0.1 °C/min above 240 °C, and intermittently kept constant for no less than 2 h during heating until 1,2‐dichlorobenzene was completely dissolved in HCW. The total dissolution process of 1,2‐dichlorobenzene in HCW in the FSCR was observed under a microscope and recorded with a digital camera (TK‐C9501, JVC, Japan), as described previously . To obtain an accurate set of the liquid–liquid equilibrium experimental data for 1,2‐dichlorobenzene in HCW, the heating experiments of the same sample in a FSCR were repeated three times to determine the mean value of the dissolution T with standard deviation.…”

Section: Methodsmentioning

confidence: 99%

“…As a starting point for further research and industrial applications design, a number of novel methods to measure the solubility of hydrophobic organic compounds (HOCs) in HCW and large amounts of solubility data for organic chemicals in HCW have been reported. In previous studies, the methods for measuring the solubility of HOCs in HCW can be basically divided into static and dynamic methods . However, for most static and dynamic methods, the studies are conducted in large‐scale stainless‐steel reactors, and all of them require sampling and analyzing.…”

Section: Introductionmentioning

confidence: 99%

In situ Raman spectroscopy investigation of the solubility and dissolution mechanism of 1,2‐dichlorobenzene in hot compressed water in a fused silica capillary reactor

Bei

Chen

Wang

et al. 2017

J Raman Spectroscopy

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Hot compressed water (HCW), with its unique properties, is regarded as a promising solvent for industrial applications. A number of methods to measure the solubility of hydrophobic organic compounds (HOCs) in HCW have been reported. However, these methods were conducted in large‐scale stainless‐steel reactors, and few included an in situ study regarding the dissolution mechanism of HOCs in HCW during the solubility determination process. In this study, a fused silica capillary reactor in combination with Raman spectroscopy was applied to investigate phase changes, determine the solubility, and study the dissolution mechanism of 1,2‐dichlorobenzene in HCW. The total dissolution process of 1,2‐dichlorobenzene in HCW was observed under a microscope, and the images were recorded continuously using a digital camera. Raman spectroscopy was used to confirm the homogeneity of the 1,2‐dichlorobenzene solution during dissolution. The solubility of 1,2‐dichlorobenzene increased from 35.9 to 85.7 mg g−1 in water with increasing temperature from 256.7 to 294.1 °C. Furthermore, the dissolution mechanism of 1,2‐dichlorobenzene in HCW is proposed based on the Raman spectra of 1,2‐dichlorobenzene and water during the dissolution process in the fused silica capillary reactor. The breakage of the fully hydrogen‐bonded (tetrahedral) configuration and the consequent change in the static dielectric constant of water are deemed to be compelling reasons for the high solubility of 1,2‐dichlorobenzene in HCW. Our experimental method exhibits great potential for determining the solubility of HOCs in HCW and for investigating their dissolution behavior and dissolution mechanism at elevated pressure and temperature conditions. Copyright © 2017 John Wiley & Sons, Ltd.

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“…In recent years, due to the growing interest in subcritical fluid technology, a number of novel approaches have been proposed to measure the solubility of organic components in pressurized hot water [10][11][12][13][14][15][16][17][18][19][20]. These methods can be basically classified into static and dynamic methods [21]. To our knowledge, pressurized hot water, defined as water between 100 o C and 374 o C, is an effective solvent for both polar and non-polar compounds [22].…”

Section: Introductionmentioning

confidence: 99%

“…In the static method, an extra amount of solute and a certain amount of solvent are loaded into an equilibration cell. After the equilibrium is achieved, the sample solution is provided for analysis [21]. In the dynamic method, the solvent flows through an equilibrium solubility cell continuously.…”

Section: Introductionmentioning

confidence: 99%

Optimization of β-carotene solubility in pressurized hot water using a dynamic method and factorial methodology

Ebrahimi

Asl

Mottahedin

2019

BCC

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In this experimental investigation, the solubility of β-carotene in pressurized hot water was measured at temperatures in the range of (70-130) °C and the pressure of 20 bar by using a dynamic method. The influence of different variables, including temperature and flow rate in the range of (0.15-0.64) ml/min, on the solubility of β-carotene was investigated. Furthermore, the optimization of these parameters was done through the experimental design by using factorial methodology. The results of the experiments showed that the temperature was the main parameter affecting the solubility of β-carotene in pressurized hot water. The best conditions for solubility of β-carotene in pressurized hot water were the temperature of 85 °C and a flow rate of 0.64 ml/min. β-carotene’s solubility data in pressurized hot water were correlated with the dielectric constant values of the solvent mixture.

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Solubility and dissolution mechanism of 4-chlorotoluene in subcritical water investigated in a fused silica capillary reactor by in situ Raman spectroscopy

Cited by 13 publications

References 44 publications

Evaluation of Carbon thin Films Using Raman Spectroscopy

Evaluation of Carbon thin Films Using Raman Spectroscopy

In situ Raman spectroscopy investigation of the solubility and dissolution mechanism of 1,2‐dichlorobenzene in hot compressed water in a fused silica capillary reactor

Optimization of β-carotene solubility in pressurized hot water using a dynamic method and factorial methodology

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