Thermodynamic and kinetic study for subcritical water extraction of PAHs

Islam, Mohammad Nazrul; Jo, Young-Tae; Jung, Sun-Kook

doi:10.1016/j.jiec.2012.07.014

Cited by 40 publications

(18 citation statements)

References 31 publications

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“…In a solid–liquid extraction system, increasing temperature generally leads to reduced surface tension and dielectric constant of the liquid solvent, thereby increasing the internal mass transfer within the solid (Islam et al, ). Therefore, it was expected that higher temperature would facilitate the alkaline extraction and result in a higher protein yield.…”

Section: Resultsmentioning

confidence: 99%

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Integrating kinetics with thermodynamics to study the alkaline extraction of protein from Caragana korshinskii Kom

Zhong

Zhou

Zhang

et al. 2014

Biotech & Bioengineering

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Extraction and recovery of protein from abundant plant biomass is one potential way to improve the economic feasibility of biorefineries. However, valorization of the protein fraction is challenging due to its low yield (kg protein extraction/kg biomass). In order to reveal the limiting operation parameters, the alkaline extraction process of protein from Caragana korshinskii Kom. was investigated by an integrative analysis of kinetics and thermodynamics. Both a two-site kinetic extraction model and a second-order model indicated that particle size is the most pivotal factor affecting protein extraction yield. In a two-site model, most proteins are extracted quickly from broken cells, while protein removal from the intact cells takes much longer; these are the faster and slower processes, respectively. A decrease of particle size from 20-40 to 60-80 mesh resulted in a decrease of C2 (protein yield in the slower process) from 14.02 to 7.32 mg g(-1), but a great increase of C1 (protein yield in the faster process) from 20.61 to 59.07 mg g(-1) . However, the protein yield was dominated by the faster process when the average particle size is under 80 mesh. The maximum initial extraction rate was 72.20 mg g(-1) min(-1) with the particle size of 60-80 mesh, almost ninefold of that with 20-40 mesh. Thermodynamic analysis revealed that the enthalpy change (ΔH) and entropy change (ΔS) in the protein extraction process were calculated as 21.08 kJ mol(-1) and 84.76 J K(-1), respectively. The standard free energy (ΔG) had a magnitude from -3.77 to -5.46, suggesting that the extraction process was spontaneous and physically feasible.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, two parallel processes, one faster and one slower, were considered in a two‐site kinetic model. The equation of a two‐site kinetic model can be described (Islam et al, ) by the following form:

\frac{C_{t}}{C_{\infty}} = 1 - F {normale}^{- k_{1} t} - [(1 - F) {normale}^{- k_{2} t}]

…”

Section: Methodsmentioning

confidence: 99%

Integrating kinetics with thermodynamics to study the alkaline extraction of protein from Caragana korshinskii Kom

Zhong

Zhou

Zhang

et al. 2014

Biotech & Bioengineering

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“…Furthermore, the high temperature-pressure associated with SCWE not only decreases the water polarity, but also increases the pressure within the plant cells. This increase in pressure effectively ruptures the cell walls, pores, and oil glands of the plant cells to enhance the essential oil recovery process [ 24 , 25 , 26 , 27 ]. However, a prolonged extraction time under a high temperature leads to degradation, which reduces the oil yield [ 28 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

“…The disruption of the cell walls promotes the efficiency of the water, by removing the barrier in its way. In addition, the increase in pressure within the plant glands, serves to improve the essential oil extraction process [ 26 , 27 , 43 , 51 ]. Previous investigations also reported severe rupturing of the sample‘s cell walls, following SCWE at different temperatures [ 39 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

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Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

et al. 2020

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A method that delivers a high yield and excellent quality of essential oil, which retains most of its value-added compounds, and undergoes least change after the extraction process, is greatly sought after. Although chemical free methods are acceptable, they call for an extensive processing time, while the yield and quality from these methods are often disappointing. This work utilizes subcritical water technology to address these issues. In this undertaking, essential oil was extracted from Aquilaria malaccensis wood by way of subcritical conditions, and characterized through gas chromatography/mass spectroscopy (GC/MS). Optimization through response surface methodology revealed temperature to be the most critical factor for the extraction process, while the optimum conditions for temperature, sample-to-solvent ratio, and time for subcritical water extraction was revealed as 225 °C, 0.2 gr/mL, and 17 min, respectively. The subcritical water extraction technique involves two simultaneous processes, which are based on good fitting to the two-site kinetic and second order model. In comparison to the hydrodistillation method, GC/MS results indicated that the quality of A. malaccensis’ wood oils, derived through the subcritical water technique, are of significantly better quality, while containing many constructive value-added compounds, such as furfural and guaiacol, which are useful for the production of pesticides and medicines. Pore size, functional groups, and morphology analysis revealed the occurrence of substantial damage to the samples, which facilitated an improved extraction of bio-products. In comparison to conventional methods, the use of the subcritical method not only involves a shorter processing time, but also delivers a higher oil yield and quality.

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Subcritical Water Remediation of Petroleum and Aromatic Hydrocarbon-Contaminated Soil: a Semi-pilot Scale Study

Islam

Park

2014

Water Air Soil Pollut

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Thermodynamic and kinetic study for subcritical water extraction of PAHs

Cited by 40 publications

References 31 publications

Integrating kinetics with thermodynamics to study the alkaline extraction of protein from Caragana korshinskii Kom

Integrating kinetics with thermodynamics to study the alkaline extraction of protein from Caragana korshinskii Kom

Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

Subcritical Water Remediation of Petroleum and Aromatic Hydrocarbon-Contaminated Soil: a Semi-pilot Scale Study

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