• Title, Summary, Keyword: extraction rate constant

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Preliminary Study: Comparison of Kinetic Models of Oil Extraction from Vetiver (Vetiveria Zizanioides) by Microwave Hydrodistillation

  • Kusuma, Heri Septya;Rohadi, Taufik Imam;Daniswara, Edwin Fatah;Altway, Ali;Mahfud, Mahfud
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.574-577
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    • 2017
  • In Indonesia, vetiver oil is one commodity that plays an important role in the country's foreign exchange earnings. Currently, the extraction of essential oil from vetiver still uses conventional methods. Therefore, the aim of this study was to know and verify the kinetics and mechanism of microwave hydrodistillation of vetiver based on two models. In this study, microwave hydrodistillation was used to extract essential oils from vetiver. The extraction was carried out in nine extraction cycles of 20 min to 3 hours. The rate constant, the equilibrium extraction capacity, and the initial extraction rate were calculated using the two models. Kinetics of oil extraction from vetiver by microwave hydrodistillation proved that the extraction process was based on the second-order extraction model. The second-order model was satisfactorily applied, with high coefficients of correlation ($R^2=0.9427$), showing that it well described the process.

Transport of Zinc Ion in a Contained Liquid Membrane Permeator with Two Micro-Porous Films (지지막을 이용하는 액막 추출기 내에서 아연 이온의 이동)

  • 주창식;이석희;이민규;홍성수;하홍두;정석기
    • Journal of Environmental Science International
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    • v.9 no.2
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    • pp.159-164
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    • 2000
  • For the purpose of development of a liquid membrane permeator which separates metal ions from aqueous solutions continuously and effectively, a continuous membrane permeator with the membrane solution trapped between extraction and stripping phases by two micro-porous hydrophilic films was manufactured. Experimental researches on the separation of zinc ion from aqueous solutions were performed in the liquid membrane permeator with 30 vol % D2EHPA solution in kerosine as liquid membrane. As results, the liquid membrane permeator separates zinc ion from aqueous solutions continuously and effectively in the wide range of operating conditions. A simple mass transfer rate model using equilibrium constant of the extraction reaction for the system used were proposed, and the model was compared with experimental results of separation of zinc ion in the permeator. And the effects of operating factors, such as space time, pH of extraction solution, extraction temperature, on the separation rate of zinc ion in the permeator were experimentally examined.

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Equlibrium and Kinetics of Metal Extraction by Amidoxime (Amidoxime에 의한 금속 추출 평형 및 추출 속도)

  • Shin, Jeong-Ho;Min, Seong-Kee;Jeong, Kap-Seop;Kim, Joo-Seok
    • Applied Chemistry for Engineering
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    • v.5 no.1
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    • pp.149-159
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    • 1994
  • The kinetics and equilibrium of metal extraction by benzamidoxime and phenylacetamidoxime-chloroform were investigated to apply amidoxime to metal extraction as chelating agent. The overall extraction constant extraction mechanism and selective extraction of copper were examined from the relation among extraction ratio, hydrogen ion concentration and extractant concentration. The experimental rate equation of copper extraction coincided with the theoretical rate equation and was expressed as $R_o=k{\overline{C}}_{HRo}(C_{Mo}/C_{Ho})^{1/2}$. The chemical species extracted was found to the type of ${\overline{CuR_2}}$.

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Influence Factor on Remediation of PAHs-Contaminated Soil by Using Flowing Subcritical Water (흐름식 아임계수를 이용한 PAHs 오염토양 정화 영향인자)

  • Jo, Young-Tae;Islam, Mohammad Nazrul;Park, Jeong-Hun
    • Journal of Soil and Groundwater Environment
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    • v.18 no.4
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    • pp.1-7
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    • 2013
  • Subcritical water which acts as organic solvent with increasing temperature and pressure because dielectric constant and viscosity decrease can be used to remediate PAHs-contaminated soil. Factors influencing on extraction were studied with varying the water temperature $200{\sim}275^{\circ}C$, extraction time 0~90 min, flow rate 10~100 mL/min and pressure 3.9~10MPa. 300 g of soil sample which was contaminated with PAHs(naphthalene, phenanthrene, fluoranthene and pyrene; 423, 420, 539 and 428 mg/kg of initial concentration) was packed into the cell and placed to reactor and then the subcritical water was pumped through the cell for PAHs extraction. Naphthalene was removed almost 100% at relatively low temperature ($200^{\circ}C$). The removal rate of phenanthrene, fluoranthene, and pyrene increased by 8, 26, and 23% when the temperature increased from 200 to $275^{\circ}C$; and it was gradually increased as extraction time increased from 0 to 90 min. Decreasing removal rate when water flow rate increased from 10 to 30 mL/min, but there was no significant change after 30 mL/min. This is supposed due to channeling phenomenon. The pressure was not an effective factor for extraction of PAHs in this study. Based on the results, the importance of effective factor was in following sequence: temperature >> time > flow rate.

Composite copper powder from Kelex 100 (Kelex100로부터 구리입자 분말 합성)

  • ;P.R Taylor
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.8 no.1
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    • pp.131-137
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    • 1998
  • A composite copper coated powder was generated by pressure hydrogen stripping copper from Kelex 100 solvent extractant in the presence of silica powder. Within the limitation of solvent extraction under constant conditions, both loading level and stripping rate were reproducible. The stripping copper kinetics are reduced from a divalent state to a metallic state and then deposited on the surface of the silica powder. Copper nucleates heterogeneously on the seed particles. They are giving an agglomerated and non - uniform powder.

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Liquid-liquid extraction process for gas separation from water in polymeric membrane: Mathematical modeling and simulation

  • Salimi, Nahid;Moradi, Sadegh;Fakhar, Afsaneh;Razavi, Seyed Mohammad Reza
    • Membrane Water Treatment
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    • v.7 no.5
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    • pp.463-476
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    • 2016
  • In this study, application of polypropylene hollow fiber membrane contactors for $CO_2$ removal from water in liquid-liquid extraction (LLE) mode was simulated. For this purpose, a steady state 2D mathematical model was developed. In this model axial and radial diffusion was considered to $CO_2$ permeation through the hollow fibers. $CO_2$ laden water is fed at a constant flow rate into the lumen side, permeated through the pores of membrane and at the end of this process, $CO_2$ solution in the lumen side was extracted by means of aqueous diethanolamine (DEA) and chemical reaction. The simulation results were validated with the experimental data and it was found a good agreement between them, which confirmed the reliability of the proposed model. Both simulation and experimental results confirmed the reduction in the percentage of $CO_2$ removal by increment of feed flow rate.

Extraction Conditions of Barley Tea in Cylindrical Packed Column (원통형 충전 탑에서 보리차의 추출조건)

  • 박상기;전재근
    • The Korean Journal of Food And Nutrition
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    • v.4 no.2
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    • pp.141-148
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    • 1991
  • In order to Investigate the extraction mechanism of barley tea in cylindrical packed column, pilot plant scale packed column was designed and constructed. And extraction conditions for steady flow in the packed column were searched. The main results of this study are as follows ; 1. Circulation of the stock barley tea before the extraction running was indispensable In consideration of inequality, gas, particles existed in packed bed. Solid-liquid equilibrium was initially maintained after the circulation. 2. Flow direction of solvent must be up-flow for maintaining the constant bed height and flow rate during the extraction. Paessure drop in pucked bed was similar to decrease ratio of extract concentration. 3. The porosity of packed bed was in the range of 0.24∼0.36 according to the particle sloe. And it was decreased as the particle size became smaller.

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Effective Extraction of Sea Mustard with Supercritical Carbon Dioxide (초임계 이산화탄소에 의한 미역의 효과적 추출)

  • Lee Seok-Hee;Cheon Jae-Kee;Ju Chang-Sik
    • Journal of the Korean Institute of Gas
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    • v.3 no.1
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    • pp.33-40
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    • 1999
  • The extraction characteristics of lipids from powdered sea mustard have been investigated by the use of supercritical carbon dioxide($SC-CO_2$) and cosolvents. The extraction rate was increased as the particle size of the sea mustard is smaller, the pressure is higher, the temperature is lower, and the quantities of the fluid is more. However, the extraction yield of lipids from sea mustard was almost constant at a given condition. The optimum extraction condition was determined with the extraction yield of $1.45wt\%$ at 300um of particle size, 313K of $SC-CO_2$ temperature, 13.8MPa of pressure, and 30L/min of flow rate. Ethanol was the most efficient cosolvent among ethanol, methanol, and hexane. The extraction yield was increased at about 2.21times by the addition of ethanol as a cosolvent to $SC-CO_2$. As the residence time and the average concentration of lipids were decreased, the mass transfer parameter($k_fa$) was increased. But the opposite result was obtained when the ethanol was used as cosolvent.

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Change in Molecular Weight Distribution of Diffusible Species on RTV Silicone Rubber Using Solvent Extraction and Recovery Rate of Hydrophobicity (용매추출에 의한 옥외용 RTV 실리콘고무의 분자량 변화와 발수성 회복속도)

  • Lee, Chang-R.;Kim, Dong-H.;Choi, Yong-C.;Kim, Jong-G.;Homma, H.;Izumi, K.
    • Proceedings of the KIEE Conference
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    • pp.1337-1339
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    • 2001
  • We have investigated the relation between the molecular weight distribution (MWD) of diffusible species and the recovery rate of hydrophobicity of room-temperature vulcanizing (RTV) silicone rubber (SIR) using solvent extraction at various temperatures. It was observed that the extract had a MWD ranging from a few hundreds g/mol to hundreds of thousands g/mol. By measuring the migration of siloxane to the extracted SIR surface through a thin carbon coating, the aspect of migration of diffusible species was observed as a real time plot, and the time constant of the migration was also calculated. According to the time dependence of IR-absorbance, the time constant was increased with the increase of MW of the extracts.

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Solvent Extraction of Cu(II) by 2,4-Heptadione in Chloroform (2, 4-Heptadione에 의한 Cu(II)의 용매추출특성)

  • Shin, Jeong-Ho;Jeong, Kap-Seop;Lee, Sang-Hoon;Park, Sang-Wook;Park, Dae-Weon
    • Applied Chemistry for Engineering
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    • v.4 no.4
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    • pp.672-682
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    • 1993
  • 2, 4-Heptadione(abbreviated to 24HTD) was synthesized from methylpropyl ketone and ethyl acetate with sodium amide, and the equilibrium and the kinetic characteristics of copper extraction by 24HTD-chloroform were investigated. Equilibrium constants such as the dissociation constant and the distribution coefficient of 24HTD and the stability constant of the 24HTD-Cu chelate were evaluated from the spectrophotometry, and the overall equilibrium constant of the extraction was also determined. The extracted species of the 24HTD-Cu chelate was found to be $CuR_2$ and the initial rate of the extraction of coupper by 24HTD in chloroform was expressed by $R_0=k[\bar{HR}]([Cu^{2+}]/[H^+])^{0.5}$.

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