Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
A Simple Approach to the Synthesis of 3-Substituted Rhodanines and Thiazolidine-2,4-diones
1833
1838
EN
Fezzeh
Aryanasab
Department of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, Iran
Alireza
Shokri
Department of Chemistry, Sharif University of Technology, Tehran, Iran
Mohammad R.
Saidi
Department of Chemistry, Sharif University of Technology, Tehran, Iran
saidi@sharif.edu
A novel synthesis of 3-substituted rhodanine and thiazolidine-2,4-dione derivatives starting from aliphatic primary amines, carbon disulfide, and methyl 2-bromoacetate is described. The reaction proceeds successfully both in water and under solvent-free conditions, but 2-thioxothiazolidin-4-one (rhodanine) derivatives were obtained under solvent free-conditions, and thiazolidine-2,4-dions were formed when water was used as the solvent.
3-Substituted Rhodanines,Thiazolidine-2,4-diones,Solvent-free
https://scientiairanica.sharif.edu/article_3424.html
https://scientiairanica.sharif.edu/article_3424_9216f9bec651cf730c461d1c4240a40b.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Synthesis and Characterization of Biodegradable Multiblock Copolymers of L-Lactide, e-Caprolactone and Poly(ethylene glycol)
1839
1847
EN
J.
Mohammadi-Rovshanndeh
Caspian Faculty of Engineering, College of Engineering, University of Tehran, Rezvanshahr, , Guilan, Iran
roshandeh@ut.ac.ir
Shirzad
Bagheri
Department of Chemistry, Polymer & Composite Materials Research Laboratory, University of Malaya, 50603 Kuala Lumpur, Malaysia
Aziz
Hassan
Department of Chemistry, Polymer & Composite Materials Research Laboratory, University of Malaya, 50603 Kuala Lumpur, Malaysia
Two multiblock copolymers of polyethylene glycol (PEG), L-lactide (LLA) and e-caprolactone (CL) were synthesized and characterized. Triblock prepolymers were first synthesized using PEG with molecular weight (Mn) of 15,000 Daltons, e-caprolactone or L-lactide in the presence of Sn(Oct)2as catalyst. The triblockPCL-b-PEG-b-PCL prepolymerwith two hydroxyl functional groups was subjected to further block copolymerization with L-lactide in the presence of Sn(Oct)2as catalyst. Similarly, the triblockPLLA-b-PEG-b-PLLA prepolymerwas subjected to further block copolymerization with e-caprolactone in the presence of the same catalyst. The molecular structures of the copolymers were characterized by 1H NMR and 13C NMR analyses. Thermal behavior and thermal stability of these copolymers were evaluated by DSC and TGA thermograms, respectively. Finally,the effect of each discrete block on the thermal behavior and stability was studied in the typical pentablock copolymers.
Tailor-made polymers,e-caprolactone,L-lactide,PEG,multiblock copolymers
https://scientiairanica.sharif.edu/article_3425.html
https://scientiairanica.sharif.edu/article_3425_5199477d942fc126d951bb04bc3cc212.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
L-Proline as an efficient organocatalyst for the synthesis of quinoxaline derivatives under solvent-free conditions
1848
1854
EN
Ali
Ezabadi
Department of Chemistry, Faculty of sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran
aliezabadi@yahoo.com
Niki
Farrokhinia
Department of Chemistry, Faculty of sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran
L-Proline has been found to be an efficient organocatalyst for one-pot synthesis of quinoxaline derivatives under solvent-free conditions. The method provided advantages such as short reaction time, high yields and simple work-up.
Quinoxaline derivatives,1,2-diamines,1,2-dicarbonyls,L-proline,solvent-free conditions
https://scientiairanica.sharif.edu/article_3426.html
https://scientiairanica.sharif.edu/article_3426_bf12a269129a0006c9452424fd3ddb9f.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
An efficient method for the catalyst-free one-pot green synthesis of 2,4,5-trisubstituted imidazoles in water
1855
1862
EN
Shiva
Dehghan Khalili
Department of Chemistry, Najafabad Branch, Islamic Azad University, Isfahan, Iran
Sayed Hossein
Banitaba
Javad
Safari
Laboratory of Organic Chemistry Research, Department of Organic Chemistry, College of Chemistry, University of Kashan, 87317-51167, Kashan, Iran
safari@kashanu.ac.ir
A mild, efficient and environmentally friendly method has been developed for the green synthesis of 2,4,5-trisubstituted imidazoles via a three-component one-pot condensation of 1,2-diketones, diammonium hydrogen phosphate, (NH4)2HPO4(DAHP) and aryl aldehydes in waterunder reflux conditions. The DAHP shows remarkable activities for the synthesis of title compounds.The key advantages of this method toward conventional methods are experimental simplicity, good functional group tolerance; excellent yields, short routine, and selectivity without the need for a transition metal or base catalyst.
2,4,5-Trisubstituted imidazoles,Diammonium hydrogen phosphate,Water,Three-component
https://scientiairanica.sharif.edu/article_3427.html
https://scientiairanica.sharif.edu/article_3427_6bde08291323d762d53872f6199554b7.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Synthesis of 2-amino-4,6-diarylnicotininitriles using 3-propyldiethylenetriamine-silica as a recyclable solid base catalyst
1863
1870
EN
Khodabakhsh
Niknam
Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, 75169, Iran
niknam@pgu.ac.ir
Reza
Rashidian
Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, 75169, Iran
Abbas
Jamali
Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, 75169, Iran
A simple and efficient procedure for the preparation of 3-propyldiethylenetriaminesilica (PDTAS) by reaction of 3-chloropropylsilica with diethylene-triamine is described. 3-Propyldiethylenetriaminesilicais employed as a recyclable base catalyst for the synthesis of 2-amino-4,6-diarylnicotininitrilefrom the reaction of acetophenone derivatives, aromatic aldehydes, malononitrile, and ammonium acetate under solvent-free conditions at 100 oC. The heterogeneous solid base catalyst was recycled for four runs upon the reaction of 4-chloroacetophenone, 4-chloroenzaldehyde, malononitrile, and ammonium acetate without losing its catalytic activity.
3-Propyldiethylenetriaminesilica,2-amino-4,6-diarylnicotininitriles,solid base catalyst,pyridines,aldehydes,Solvent-free
https://scientiairanica.sharif.edu/article_3428.html
https://scientiairanica.sharif.edu/article_3428_44c4cec1643f45fb144853c3434a64dc.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Biosorption of As(III) from aqueous solution by Acacia auriculiformisleaves
1871
1880
EN
Mohammad
Al-Mamun
aSchool of Physical Sciences, Department of Chemistry, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh
mamun_chem@yahoo.com
Mohammad
Poostforush
bDepartment of Polymer Engineering, Islamic Azad University, South Tehran Branch, Tehran-11365-4435, Iran
Sharif Ahmed
Mukul
cSchool of Agriculture and Food Sciences, The University of Queensland, Brisbane Qld 4072, Australia
Md. Khaled
Parvez
Synthetic Chemistry Group, Max Planck Institute for Polymer Research, Ackermannweg 10,
Md. Abdus
Subhan
aSchool of Physical Sciences, Department of Chemistry, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh
subhan-che@sust.edu
The biosorption capability of Acacia (Acacia auriculiformis A.Cunn.exBenth.) leaf powder in batch and small scale column was investigated. The adsorption properties were analyzed with different experimental variables such as solution pH, amount of biosorbent, initial As(III) concentration and temperature. The maximum adsorption was observed at pH 6.0 while the equilibrium was attained in 5 h. Langmuir and Freundlich equilibrium adsorption isotherm models were utilized for fitting the experimental data. The maximum adsorption capacity of A. auriculiformisleaf powder was calculated to be 41.410 μg g-1. The kinetic data were well fitted by pseudo-first-order model with the correlation coefficient greater than 0.989. Surface morphology of the biosorbent was analyzed by scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) was employed to characterize the surface functional groups of A. auriculiformisleaf powder.The activation energy (Ea) and heat of biosorption (∆H) were calculated to be 27.549 and 43.380 kJ mol-1 respectively. The thermodynamic parameters such as Gibbs free energy (∆G), enthalpy (∆H), and entropy (∆S) revealed the spontaneous nature of the biosorption followed by physical activated process. Small scale column tests (SSCT) were also conducted to find out the breakthrough characteristics of the column packed with biosorbent.
Arsenic,Biosorption,Acacia auriculiformis,Langmuir isotherm,FTIR
https://scientiairanica.sharif.edu/article_3429.html
https://scientiairanica.sharif.edu/article_3429_3e99822e66b92b619bff2842c87193bf.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Dimerization ofIsoquinolinium Ylide and 1,3-Dipolar Cycloaddition with Isoquinoline: Synthesis of Nitrogen-Containing Heterocyclic Compounds
1881
1884
EN
Mohammad
Seifi
Department of Chemistry, Faculty of Science, Shahid Bahonar University, P.O. Box 76169, Kerman, Iran
mohammadseifi61@yahoo.com
Fatemeh
Alinaghizadeh
Department of Chemistry, Faculty of Science, Shahid Bahonar University, P.O. Box 76169, Kerman, Iran
falinaghi65@yahoo.com
Hassan
Sheibani
Department of Chemistry, Faculty of Science, Shahid Bahonar University, P.O. Box 76169, Kerman, Iran
hsheibani@mail.uk.ac.ir
Dimerization and 1,3-dipolar cycloaddition reactions of isoquinolinium ylidewith isoquinolinehave been investigated to prepare diaza-dibenzo compounds in good to excellent yields and in a short reaction time. These reactions occur in the presence of base catalyst such as triethylamine at room temperature.
Isoquinolinium ylide,1,3-Dipolar cycloaddition,Diaza-dibenzo compounds
https://scientiairanica.sharif.edu/article_3430.html
https://scientiairanica.sharif.edu/article_3430_bcc8fdc6b5631d4a955d1f6896bc9a80.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Nano silica phosphoric acid: as a suitable catalyst for synthesis of trisubstituted imidazoles via sonication condition
1885
1889
EN
A.
Bamoniri
Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. Iran
bamoniri@kashanu.ac.ir
B.F.
Mirjalili
Department of Chemistry, College of Science, Yazd University, Yazd, P.O. Box 89195-741, I. R. Iran
S.
Nazemian
Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. Iran
Nano silica phosphoric acid has been found to be a suitable catalyst for the preparation of 2,4,5-tri-substituted imidazoles via three-component reactions of benzil, aldehydes and ammonium acetate under sonication condition.
2,4,5-tri substituted imidazole,silica phosphoric acid,Benzil,sonication condition,Heterogeneous catalyst
https://scientiairanica.sharif.edu/article_3431.html
https://scientiairanica.sharif.edu/article_3431_e97901aabede598f5ef3e1064d8462b6.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Sol-gel preparation and characterisation of SnO2 powders employed as catalyst for phenol photodegradation
1891
1898
EN
Hadj
Benhebal
Laboratoire de Chimie et Environnement, Université de Tiaret, BP 78 Zaaroura, Tiaret 14000, Algeria
benhebalh@yahoo.fr
Messaoud
Chaib
Laboratoire de Chimie et Environnement, Université de Tiaret, BP 78 Zaaroura, Tiaret 14000, Algeria
Angélique
Léonard
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Ludivine
Tasseroul
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Carlos
A.Paèz
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Thierry
Salmon
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Dirk
Poelman
Ghent University, Lumilab, Department of Solid State Sciences, Krijgslaan 281-S1, B-9000 Ghent, Belgium
Michel
Crine
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Benoît
Heinrichs
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Jean-Paul
Pirard
Laboratoire de Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium
Crystallized pure SnO2 powders were prepared by the sol-gel process and were used as photocatalyst for the degradation of phenol under UV light at pH 6.5 and a temperature of 20°C. The physical properties of photocatalyst were characterized by X-ray diffraction, Scanning Electron Microscopy, nitrogen adsorption-desorption and Ultraviolet-visible diffuse reflectance spectroscopy. The influences of different operating variables such as the pH, the photocatalyst loading, the initial concentration of phenol, were studied to improve the efficiency of phenol degradation.
Tin dioxide,Sol&ndash,gel,Photocatalysis,Phenol degradation
https://scientiairanica.sharif.edu/article_3432.html
https://scientiairanica.sharif.edu/article_3432_5396e826d91716de3639136a636b41b3.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Study the Effect of Adding Co-Solvent (n-Alkoxyethanol) To Sulfolane on the Toluene Extraction
1899
1911
EN
Khalid Farhod
Chasib
Chemical Engineering Department, University of Technology, Baghdad, Iraq
khalid_farhod@uotechnology.edu.iq
Liquid–liquid equilibrium data, both binodal and tie lines are presented for the pseudo-ternary systems: {(sulfolane + n-Alkoxyethanol) + octane + toluene} at 293.15 K. The experimental liquid–liquid equilibrium data have been correlated using the nonrandom two liquid (NRTL), UNIQUAC and UNIFAC models to predict the phase composition of the systems studied here, and the binary interaction parameters of these components have been calculated. The correlated tie lines have been compared with the experimental data. The comparisons indicate thatthecalculation based onboth NRTL and UNIQUAC models gave a good representation of theequilibrium compositionsdata for all systems studied. Also Othmer, Tobias and Hand method satisfactorily correlated tie-line data of the studied systems. The agreement between the correlated and experimental results was very good. The solvent (25% sulfolane+75% 2-ethoxyethanol) shows high capacity for toluene (a distribution coefficient around unity) and for this reason it can be used for higher recovery of aromatics at lower solvent to feed ratios and temperatures.
Liquid&ndash,liquid equilibrium, sulfolane, n-Alkoxyethanol, Extraction, NRTL, UNIQUAC, UNIFAC
https://scientiairanica.sharif.edu/article_3433.html
https://scientiairanica.sharif.edu/article_3433_0dfdf16780e22d3351ebc699d34d649f.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Effects of viscoelastic polymer solutions on the oil extraction from dead ends
1912
1920
EN
Ata
Kamyabi
Department of Chemical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
Ahmad
Ramazani S.A.
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
ramazani@sharif.edu
Mohammad Mahdi
Kamyabi
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
This research deals with the numerical simulation of two viscoelastic fluids flow in an open capillary of a reservoir. The Oldroyd-B and Leonov models have been used to describe the rheological behavior of polymer solutions. The nite volume method on a structured and collocated grid has been used for discretization the governing equations. The discrete elastic viscous stress splitting technique also has been used. The steady state, isothermal and incompressible fluids past through a two dimensional micropore have been considered. The numerical method has been validated through the comparison of numerical results by the analytical solutions of Oldroyd-B fluid flow through a planar channel.
The effects of fluid characteristics and operating
conditions on the oil sweeping from the dead ends are investigated. The contours of velocity, stream function and pressure are presented, and the swept depth is calculated. The presented results show that with increasing the Weissenberg number the swept depth of
ooding fluid in the dead ends increases considerably. However, in the studied range, the Reynolds number does not have any signi cant e ects on the sweep efficiency. The results also show that the swept depth in the case of viscoelastic fluids is more than the Newtonian and generalized Newtonian fluids.
Viscoelastic,Oldroyd-B,Leonov,polymer solution,numerical simulation,dead end
https://scientiairanica.sharif.edu/article_3434.html
https://scientiairanica.sharif.edu/article_3434_7989ab35b9308dd9785c7d5c563c65a3.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Gas separation properties of crosslinked and non-crosslinked Carboxymethylcellulose (CMC)membranes
1921
1928
EN
Seyed Iman
Miremadi
Department of Energy Engineering, Sharif University of Technology, Tehran, Iran
miremadi@energy.sharif.edu
Navid
Shafiabadi
Department of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, Iran
musavi@sharif.edu
Mohammad Sadegh
Amini-Fazl
Department of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, Iran
aminifazl@alum.sharif.edu
In this study, crosslinked and non-crosslinked carboxymethylcellulose (CMC) membranes were prepared with different concentrations of polymer. Then, the permeability of pure CO2, N2, and CH4was measured through these membranes in dry state,to investigate the influence of polymer concentration and applied feed pressure on permeability and permselectivity. The permeability of CO2through membranes was higher than the other gases. A comparison of permeabilities revealed that (the)permeability of N2, CO2(,)and CH4 increased on an average of 33, 40 and 20 percent, respectivly, by increasing the feed pressure from 6 to 10 bar. Increasing CMC concentration from 1.2 to 3.0 wt%, the permeability of N2, CO2(,)and CH4 decreased on an average of 25, 12 and 19 percent, respectivly. Also, the CO2/CH4and CO2/N2 permselectivities increased 9 and 18 percent, respectivly, with an increment in CMC concentration from 1.2 to 3 wt%. The crosslinked CMC membranes with the same polymer concentrations were also prepared to investigating(to investigate) theeffects of crosslinking reaction on permeability and permselectivity.The ATR-FTIR test was applied,and the peak at about 1108 cm-1 confirmed the presence of corsslinker groups. The comparision of gas permeation test results for crosslinked and non-crosslinked CMC membranes showed that the gas permeability decreased and its permselectivity increased due to crosslinking reaction. According to Robeson’s plots, the prepared CMC membranes would have potential for commercialization.
Membrane,Carboxymethylcellulose,Gas separation,Gas permeability,Permselectivity
https://scientiairanica.sharif.edu/article_3435.html
https://scientiairanica.sharif.edu/article_3435_8ac71a15406978857fd6f92b490e2fb9.pdf
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
20
6
2013
12
01
Biodegradation of heavy fuel oil by newly isolated strain Enterobacter cloacae BBRC10061: study on unstructured kinetic models and innovative equation
1929
1938
EN
Alireza
Chackoshian Khorasani
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, Tehran 11155-9465, Iran
Mansour
Mashreghi
Cell and molecular research group, Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi sq., Mashhad 91775-1436, Iran
mashrghi@um.ac.ir
Soheyla
Yaghmaei
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Avenue, Tehran 11155-9465, Iran
Modeling process is very important and valuable to predict process outcome, especially to bioprocesses which are intricate. Because of complex hydrocarbon compounds and oscillations happened in the medium of process, biodegradation of mazut has not already been investigated by mathematical models. In this study, an indigenous bacterium was isolated from oil contaminated soil to investigate biodegradation of mazut at different experimental conditions. Data resulted from mazut degradation, pH, and electrical potential in the medium were recorded. Some kinetic models reported and combinations of them were investigated to practically modeling the process. In addition, a new equation, that can predict various phenomena, was applied to functionalize changes of mazut concentration, pH, and electrical potential. Any of the kinetic models didn't have potential for modeling behavior of mazut biodegradation at different conditions. Opposed to them, the novel equation was able to predict desirable parameter using two variables, and functionalize data by appropriate coefficients.
Kinetic model,General predictive equation,pH modeling,Electrical potential modeling,Biodegradation,Mazut
https://scientiairanica.sharif.edu/article_3436.html
https://scientiairanica.sharif.edu/article_3436_93beccdf6dda5ea9e341d2d4d9c30162.pdf