ORIGINAL_ARTICLE
A New Tri-Parametrical Law of Corresponding States for Subcritical Dense Fluids
This article introduces a new tri-parameter law of corresponding states from the known regularities, namely the LIR and Zeno line for dense fluids (when Tz=Tc). Two of these parameters are the Zeno line parameters and the third parameter (the fluid parameter), has been obtained from the LIR, this parameter is solely dependent upon the fluid characteristics. The third parameter can be obtaind from p-v-T data of at least two different isotherms of the fluid. These three parameters enable us to calculate quantities such as the density of the fluid, within a reasonable accuracy (the maximum error is less than 5%). Comparing the calculated results with the experimental values shown that this law can at least be applied to spherical, polar and hydrocarbon fluids.
https://ijcce.ac.ir/article_9935_573e93a401ab829411c74e1321b1ee78.pdf
1998-12-01
49
53
10.30492/ijcce.1998.9935
Corresponding states
Supercritical
Dense fluid
Fluid parameter
Gholam Abbas
Parsafar
parsafar@sharif.edu
1
Department of Chemistry, Isfahan University of Technology, Zip code 84154, Isfahan, I.R. IRAN
AUTHOR
Yousef
Ghayeb
2
Department of Chemistry, Isfahan University of Technology, Zip code 84154, Isfahan, I.R. IRAN
LEAD_AUTHOR
ORIGINAL_ARTICLE
Determination of Polycyclic Aromatic Hydrocarbons in Ambient Urban Air
Polycyclic aromatic hydrocarbons (PAHS) have been determined in the atmosphere of Isfahan, Iran. Airborne particulate matter was sampled using a high-volume air sampler at roof-top level (~6m). Extraction of PAHS from airborne particulate matter has been performed using SFE system and the relationship between the extraction temperature and the recovery of PAHS from airborne particulates is investigated. Determination of 16 PAHS has been carried out by GC-MS technique. Variation in concentration of PAHS has been compared to those for organic carbon and total suspended particles (TSP). A good agreement was found between the variation in concentration of PAHS and that for organic carbon, but weak correlation (p=0.6, r2=0.42) was found to exist between the PAHS and TSP
https://ijcce.ac.ir/article_9936_366fb0cfa89710b3d2c428212d15b883.pdf
1998-12-01
54
57
10.30492/ijcce.1998.9936
Air pollution
Polycyclic aromatic hydrocarbons
Airborne particulate matter
Extraction of PAHS by SFE
Seyed Morteza
Talebi
1
Department of Chemistry, Isfahan University, Zip code 81774, Isfahan, I.R. IRAN
LEAD_AUTHOR
ORIGINAL_ARTICLE
Stannous Chloride: A Reagent for Removal of Dimethoxytrityl Group from 5'-Dimethoxytrityl Nucleosides
Detritylation of 5'-dimethoxytrityl nucleosides have been quantitatively achieved in minutes at room temperature under aprotic neutral conditions by using stannous chloride. Of additional practical consideration and in contrast to protic acids, no depurination was observed with this reagent.
https://ijcce.ac.ir/article_10295_8704c645723827cb44d8be2de0545407.pdf
1998-12-01
58
60
10.30492/ijcce.1998.10295
Deprotection
5'-Dimethoxytrityl group
Nucleosides
Ali
Khalafi Nezhad
1
Department of Chemistry, Faculty of Science, Shiraz University, Zip code 71454, Shiraz, I.R. IRAN
LEAD_AUTHOR
Reza
Fareghi Alamdari
2
Department of Chemistry, Faculty of Science, Shiraz University, Zip code 71454, Shiraz, I.R. IRAN
AUTHOR
ORIGINAL_ARTICLE
Multinuclear Variable Temperature NMR Studies on Cyanide, Water and Hydroxyl Group Scrambling on Halogenation of K2[Pt(CN)4] and Related Reactions
195Pt and 1H NMR has been used to show that addition of chlorine and bromine to [Pt(CN)4]2_ in presence of perchloric acid in water results in cyanide and water scrambling with formation of eleven complexes of the type [Pt(CN)4-nCl(H2O)n+1](n-1)+ (n=0, 1, 2, 3, 4). Addition of NBu4OH to this solution gives (NBu4)2[Pt(CN)4Cl(OH)]. NMR measurements in acetone also show cyanide and hydroxyl group scrambling with formation of complexes of the type [Pt(CN)4-nCl(OH)n+1]2-, (n=0, 1, 2, 3, 4).
https://ijcce.ac.ir/article_10297_6fb062bf13c3b3bc764aead0d1eabc46.pdf
1998-12-01
61
65
10.30492/ijcce.1998.10297
Multinuclear NMR
Scrambling
Halogenation
Javad
Sabounchei
1
Department of Chemistry, Faculty of Science, Bu-Ali-Sina University, Zip code 65174, Hamadan, I.R. IRAN
LEAD_AUTHOR
Sadegh
Salehzadeh
2
Department of Chemistry, Faculty of Science, Bu-Ali-Sina University, Zip code 65174, Hamadan, I.R. IRAN
AUTHOR
ORIGINAL_ARTICLE
Nitroimidazoles XIII. Synthesis of Substituted (1-Methyl-5-Nitro-2-Imidazolyl) Isoxazoles
The beta0diketone derivatives of nitroimidazole were synthesized from the reaction of magnesium salt of beta-ketoaccids 3 with imidazolide 4. The raction of beta-diketones with hydroxylamine hydrochloride afforded either the isoxazoles or the 5-hydroxyl-2-isoxazolines.
https://ijcce.ac.ir/article_10300_ab5284f77dd9ffdf059d039b05f109d7.pdf
1998-12-01
66
69
10.30492/ijcce.1998.10300
Beta-diketones
Nitroimidazole
Imidazolide
Isoxazoles
Isoxazoline
Abbas
Shafiee
shafieea@tims.ac.ir
1
Department of Chemistry, Faculty of Pharmacy, The Medical Science University of Tehran, Zip code 14174, Tehran, I.R. IRAN
LEAD_AUTHOR
Mohammad ALi
Ebrahimzadeh
2
Department of Chemistry, Faculty of Pharmacy, The Medical Science University of Tehran, Zip code 14174, Tehran, I.R. IRAN
AUTHOR
ORIGINAL_ARTICLE
A Simple Method for Evaluating the Cleaning Power of Commercial Detergents
Commercial detergents, in spite of their various names and marks, are used to remove foreign matter (dirt) from substrate. Following removal of dirt from the surface, it is necessary to prevent redeposition, so the detergent must have supending power. In this experimental work, a simple method has been developed to evaluate the cleaning power of commercial detergents. The method, showing the change of surface tension of detergent solution versus concentration, makes possible the dynamic study of the cleaning power of different commercial detergents without concerning their formulation. It has been found that the method differentiates between various detergents. The examined detergents were: Arial, Barf, Bianco, Darya, Paak, Persil, Sepid, Shoma, Vash and Yes.
https://ijcce.ac.ir/article_10301_6f766f32d22bc134bbf56f2e672e968a.pdf
1998-12-01
70
72
10.30492/ijcce.1998.10301
Commercial detergents
Cleaning power
Dynamically
Evaluation
Mohammad
Chalkosh Amiri
amir33@cc.iut.ac.ir
1
Department of Chemical Engineering, Isfahan University of Technology, Zip code 84156, Isfahan, I.R. IRAN
LEAD_AUTHOR
ORIGINAL_ARTICLE
Optimizing of SCP Production from Sugar Beet Stillage Using Isolated Yeast
In this study fungi isolated from the effluent of ethanol factories were identified. Optimal conditions for single cell protein (SCP) production and COD reduction of sugar beet stillage are specified for a species of Hansenula in a continuous culture. Under these conditions 5.7 g dm-3 biomass was produced and 31% of COD was reduced without addition of further nutrients to the beet molasses stillage. Adding nitrogen and phosphorus sources، increased the biomass production and COD reduction to 8.5 g dm-3 and 35.7%، respectively. The crude protein content of SCP in the absence and presence of additives was 39.6% and to 50.6% respectively. The amounts of essential amino acids measured were greater than that of the FAO standards reference and are comparable with some other food proteins، such as soya bean and fish meal.
https://ijcce.ac.ir/article_10305_f1bd6f0631e7f3474358fe4d795512ac.pdf
1998-12-01
73
80
10.30492/ijcce.1998.10305
Single cell protein (SCP)
Stillage
Yeast
Hansenula
Seyed Abbas
Shojaosadati
shoja_sa@modares.ac.ir
1
Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, I.R. IRAN
LEAD_AUTHOR
Rasoul
Khalilzadeh
2
Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, I.R. IRAN
AUTHOR
Hamid Reza
Sanaei
3
Science and Technology Research Center, Tehran, I.R. IRAN
AUTHOR
ORIGINAL_ARTICLE
A New Mixing Rule for Mixtures of Hard Spheres
A mixing rule for the mixtures of hard-spheres is presented which can be reduced to the standard van der Waals mixing rule at low densities. The effectiveness of the mixing rule for the size and energy parameters of lennard-Jones fluid are examined by combining them with an equation of state to calculate thermodynamic properties. The results of calculation are compared with the molecular dynamic simulation data and the superiority of the present mixing rule over the standard van der Waals mixing rule is demonstrated.
https://ijcce.ac.ir/article_10303_3cd7365adca3371f9c8bd1f37ef31e0e.pdf
1998-12-01
81
88
10.30492/ijcce.1998.10303
Equation of state
Mixing rule
van der waals
Corresponding state theory
Mohsen
Mohsen Nia
1
Department of Chemical Engineering, Amir-Kabir University of technology, Tehran, I.R. IRAN
AUTHOR
Hamid
Modarres
2
Department of Chemical Engineering, Amir-Kabir University of technology, Tehran, I.R. IRAN
LEAD_AUTHOR
Gholam Ali
Mansoori
3
Department of Chemical Engineering, University of Illinois at Chicago, USA
AUTHOR
ORIGINAL_ARTICLE
The Liquid Density of Complex Liquid Mixtures
A second virial coefficient correlation suitable for two different temperatures ranges, (T*)-2£180 and (T*)-2>180, where T* is RT/DHvap is presented. The equation of state can be calculated for different, complicated non-polar, and slightly polar liquid mixtures at any temperature over the range from Ttp to Tc and up to high pressures. The latent heat of vaporization and density at the triple point are the only two parameters that are needed in these calculations. The results indicate that the liquid densities of liquid mixtures with quite different acentric factors can be predicted to within about 5%.
https://ijcce.ac.ir/article_10304_9e799262f2e66ccc1eb5d316fb12aca6.pdf
1998-12-01
89
93
10.30492/ijcce.1998.10304
Compressed liquids and mixtures
Equation of state
Density
Second Virial Coefficients
Statistical Mechanics
Mohammad Hossein
Keshavarz
1
Department of Chemistry, Malek Ashtar University of Technology, Zip code 83158, Isfahan, I.R. IRAN
LEAD_AUTHOR
Ali
Boushehri
2
Department of Chemistry, Shiraz University, Zip code 71454, Shiraz, I.R. IRAN
AUTHOR