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RISS 인기검색어
- 검색키워드
- 저자 : M.K. Aroua (검색결과 5 건)
- 무료
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The effects of catalysts in biodiesel production: A review
I.M. Atadashi,M.K. Aroua,A.R. Abdul Aziz,N.M.N. Sulaiman 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Biodiesel fuel has shown great promise as an alternative to petro-diesel fuel. Biodiesel production is widely conducted through transesterification reaction, catalyzed by homogeneous catalysts or heterogeneous catalysts. The most notable catalyst used in producing biodiesel is the homogeneous alkaline catalyst such as NaOH, KOH, CH3ONa and CH3OK. The choice of these catalysts is due to their higher kinetic reaction rates. However because of high cost of refined feedstocks and difficulties associated with use of homogeneous alkaline catalysts to transesterify low quality feedstocks for biodiesel production, development of various heterogeneous catalysts are now on the increase. Development of heterogeneous catalyst such as solid and enzymes catalysts could overcome most of the problems associated with homogeneous catalysts. Therefore this study critically analyzes the effects of different catalysts used for producing biodiesel using findings available in the open literature. Also, this critical review could allow identification of research areas to explore and improve the catalysts performance commonly employed in producing biodiesel fuel.
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Physical properties of aqueous mixtures of N-methyldiethanolamine (MDEA) and ionic liquids
R. Yusoff,A. Shamiri,M.K. Aroua,A. Ahmady,M.S. Shafeeyan,W.S. Lee,S.L. Lim,S.N.M. Burhanuddin 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In the present study, experiments have been conducted to measure the surface tension and heat capacity of aqueous mixtures of N-methyldiethanolamine (MDEA) and ionic liquids (ILs) at atmospheric pressure. Two types of ILs, 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4] and 1-butyl-3-methyl-imidazolium dicyanamide [bmim][DCA]) were used in these experiments. The surface tension was found to decrease with increasing temperature and ionic liquid concentration. Furthermore, the heat capacity of the mixtures increases with decreasing ionic-liquid concentration and increasing temperature. Linear equations were used to correlate the measured surface tension values, quadratic equations were applied to correlate the heat capacity at different compositions and temperatures.
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Chun Ming Chew,M.K. Aroua,M.A. Hussain 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
In this work, a novel approach combining first principle equation of Darcy’s law on cake filtration andartificial neural network (ANN) predictivemodels were utilized to represent the dead-end ultrafiltration(UF) process. Common on-line data available in most industrial-scale UF membrane water treatmentplant such as feed water turbidity, filtration time and transmembrane pressure were used as inputsparameters. An UF pilot plant was set up to carry out these experiments. This hybridmodelling approachconsisting of cake filtration and ANN models have shown promising results to predict the specific cakeresistance and total suspended solids of the feed water with good accuracy. These two filtrationparameters are often considered as indicators for membrane fouling propensity. Sensitivity analysis hasindicated strong linear correlation between feed water turbidity and specific cake resistance in the UFprocess. The hybrid model provides an alternative method to estimate these parameters besides theconventional laboratory analysis. This practical modelling approach will be beneficial to industrial-scaleUF membrane water treatment plant operations to predict the fouling propensity of the UF process basedon commonly available on-line data and simple laboratory analysis.
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Al‐Hakimi Ahmed N.,Abdulghani Mahfoudh A.M.,Alhag Sadeq K.,Aroua Lotfi M.,Mahyoub Jazem A. 한국곤충학회 2022 Entomological Research Vol.52 No.3
The development of natural insecticide from plant products may have a beneficial effect as a promising candidate for practical strategies for controlling vector-borne diseases without current treatment. The present study was carried out to characterize green synthesized metallic nanomaterials for silver (Ag-NPs) and gold (Au-NPs) from extract leaf of Nerium oleander L., assess in vivo toxicity, and evaluate the larvicidal activity against Aedes aegypti. The prepared nanomaterials (Ag-NPs and Au-NPs) were characterized by Ultraviolet–Visible Spectroscopy (UV–Vi s ) , F o u r i e r transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and transmission electron microscopy (TEM). In addition, the subacute in vivo toxicity method was used to assess the extract and the nanomaterials (Ag-NPs and Au-NPs); in evaluating larvicidal activities using the World Health Organization (WHO) method. The Ag-NPs and Au-NPs were confirmed by shifting the absorption band in UV–Vi s , FTIR spectrums toward higher wavelengths. TEM and XRD analysis were revealed that the average particle size of Au-NPs and Ag-NPs showed 15.30 and 11.48 nm, respectively. In the toxicity experiment, no mortality or signs of toxicity were reported in all groups of treated animals; in larvicidal activity, the Au-NPs and Ag-NPs with LC50 36.0716 and 46.645 ppm respectively showed more effectiveness than leaf extract alone 108.1665 ppm. Collectively, extract leaf of N. oleander L. can be efficiently used to synthesize metallic nanomaterials with silver and gold, which can be adopted as a natural source of insecticide against Ae. aegypti.
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Reza Afshar Ghotli,Abdul Raman Abdul Aziz,I.M. Atadashi,D.B. Hasan,Pei San Kong,M.K. Aroua 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Crude glycerol, the main byproduct of biodiesel production, consists of excess methanol and otherimpurities and can be converted into other useful products through purification or conversion processes. In this work, dynamic viscosities, densities, excess molar volumes and refractive indexes for severalmixtures of biodiesel crude glycerol and methanol with were determined at different temperatures. Thephysiochemical characteristics of crude glycerol in mixture form with methanol could be useful for thedesign of industrial equipment and purification or conversion process. The results demonstratedtemperature dependent behaviors of all binarymixtures. The empirical correlations were obtained basedon the experimental results.
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