scholarly journals Optimization of operating parameters to remove and recover crude oil from contaminated soil using subcritical water extraction process

2018 ◽  
Vol 23 (2) ◽  
pp. 175-180 ◽  
Author(s):  
Golam Taki ◽  
Mohammad Nazrul Islam ◽  
Seong-Jae Park ◽  
Jeong-Hun Park
Keyword(s):  
Crude Oil ◽  
Contaminated Soil ◽  
Subcritical Water ◽  
Extraction Process ◽  
Water Extraction ◽  
Operating Parameters ◽  
Subcritical Water Extraction

scholarly journals Subcritical Water Extraction of Chestnut Bark and Optimization of Process Parameters

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2774 ◽  
Author(s):  
Tanja Gagić ◽  
Željko Knez ◽  
Mojca Škerget
Keyword(s):  
Process Parameters ◽  
Subcritical Water ◽  
Extraction Process ◽  
Extraction Yield ◽  
Water Extraction ◽  
Bark Extract ◽  
Total Phenol Content ◽  
Process Conditions ◽  
Subcritical Water Extraction ◽  
Influence Of Process Parameters

The aim of the work was the optimization of the subcritical water extraction process of chestnut bark using Box–Behnken response surface methodology. The influence of process parameters, such as temperature, extraction time and solvent-solid ratio, on extraction yield, yield of the main compounds, total phenol content, total tannin content and antioxidant activity has been investigated. The identified compounds were ellagic and gallic acids, ellagitannins (vescalagin, castalagin, 1-o-galloyl castalagin, vescalin and castalin), sugars (maltose, glucose, fructose and arabinose) and sugar derivatives (5-HMF, furfural and levulinic acid). Finally, the optimal process conditions for obtaining the bark extract highly rich in ellagic acid and with satisfactory levels of total phenols and total tannins have been determined.

scholarly journals Yield and Extraction Rate Analysis of Phytochemical Compounds from Eucheuma cottonii, Ganoderma lucidum, and Gracilaria sp. using Subcritical Water Extraction

2021 ◽  
Vol 21 (1) ◽  
pp. 27
Author(s):  
Fesa Putra Kristanto ◽  
Siti Machmudah ◽  
Sugeng Winardi ◽  
Wahyudiono Wahyudiono ◽  
Motonobu Goto
Keyword(s):  
Ganoderma Lucidum ◽  
Subcritical Water ◽  
Extraction Process ◽  
Extraction Rate ◽  
Water Extraction ◽  
Kinetics Model ◽  
Optimum Temperature ◽  
Subcritical Water Extraction ◽  
Phytochemical Compounds ◽  
Eucheuma Cottonii

Eucheuma cottonii (E. cottonii), Ganoderma lucidum (G. lucidum), and Gracilaria sp. are plants that contain high phytochemicals, such as flavonoids, polyphenols, saponins, and tannins. In this work, the phytochemicals were obtained using the subcritical water extraction (SWE) process. The SWE method uses water as a solvent in subcritical conditions. Therefore, the SWE process is an environmentally friendly process for extraction. In order to run the SWE process optimally, measurement of the extraction rate of SWE is needed. Calculation of the extraction rate of SWE process used first and second-order models according to Lagergren equation. SWE process was started by setting temperatures from 140 to 180oC at a pressure of 7 MPa and solvent flow rate of 1 ml/min. Before starting the extraction, the raw material was loaded into the extractor. The raw materials used were E. cottonii, G. lucidum, and Gracilaria sp. The extraction process was carried out for 3 hours, and the product was collected every 30 minutes. The collected product was put into a sample bottle and dried using a freeze dryer. After that, the products obtained were balanced by an analytical scale. Based on the result, the optimum temperature for the SWE process was 180oC for E. cottonii and G. lucidum and 160oC for Gracilaria sp. The yields of the SWE process under the optimum temperature were 85.37%, 58.42%, and 75.73% for E. cottonii, G. lucidum, and Gracilaria sp, respectively. The extract contained phytochemical compounds detected by high-performance liquid chromatography analysis. The kinetics model of extraction rate for all variables exhibited a second-order kinetics model that indicated that the extraction process was influenced by more than one factor.

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

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3872
Author(s):  
M. Samadi ◽  
Z. Zainal Abidin ◽  
H. Yoshida ◽  
R. Yunus ◽  
D. R. Awang Biak
Keyword(s):  
Essential Oil ◽  
Processing Time ◽  
Subcritical Water ◽  
Value Added ◽  
Extraction Process ◽  
Water Extraction ◽  
Subcritical Water Extraction ◽  
Yield And Quality ◽  
Aquilaria Malaccensis

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.

Decontamination of PCBs-containing soil using subcritical water extraction process

Chemosphere ◽  
2014 ◽  
Vol 109 ◽  
pp. 28-33 ◽  
Author(s):  
Mohammad Nazrul Islam ◽  
Jeong-Hun Park ◽  
Moon-Su Shin ◽  
Ha-Seung Park
Keyword(s):  
Subcritical Water ◽  
Extraction Process ◽  
Water Extraction ◽  
Subcritical Water Extraction

Mahkota Dewa Subcritical Water Extraction Process: Experimental and Molecular Dynamics Simulation Study

2019 ◽  
Vol 42 (9) ◽  
pp. 1747-1756 ◽  
Author(s):  
Nurmaryam Aini Hashim ◽  
Siti Kholijah Abdul Mudalip ◽  
Noorlisa Harun ◽  
Rohaida Che Man ◽  
Siti Zubaidah Sulaiman ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Simulation Study ◽  
Subcritical Water ◽  
Extraction Process ◽  
Water Extraction ◽  
Dynamics Simulation ◽  
Subcritical Water Extraction
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