Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201A New Tri-Parametrical Law of Corresponding States for Subcritical Dense Fluids4953993510.30492/ijcce.1998.9935ENGholam Abbas ParsafarDepartment of Chemistry, Isfahan University of Technology, Zip code 84154, Isfahan, I.R. IRANYousef GhayebDepartment of Chemistry, Isfahan University of Technology, Zip code 84154, Isfahan, I.R. IRANJournal Article19960407<em>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=T<sub>c</sub>). 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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201Determination of Polycyclic Aromatic Hydrocarbons in Ambient Urban Air5457993610.30492/ijcce.1998.9936ENSeyed Morteza TalebiDepartment of Chemistry, Isfahan University, Zip code 81774, Isfahan, I.R. IRANJournal Article19970301<em>Polycyclic aromatic hydrocarbons (PAH<sub>S</sub>) 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 PAH<sub>S</sub> from airborne particulate matter has been performed using SFE system and the relationship between the extraction temperature and the recovery of PAH<sub>S</sub> from airborne particulates is </em>investigated. <em>Determination of 16 PAH<sub>S</sub> has been carried out by GC-MS technique. Variation in concentration of PAH<sub>S</sub> has been compared to those for organic carbon and total suspended particles (TSP). A good agreement was found between the variation in concentration of PAH<sub>S</sub> and that for organic carbon, but weak correlation (p=0.6, r<sup>2</sup>=0.42) was found to exist between the PAH<sub>S</sub> and TSP</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201Stannous Chloride: A Reagent for Removal of Dimethoxytrityl Group from 5'-Dimethoxytrityl Nucleosides58601029510.30492/ijcce.1998.10295ENAli Khalafi NezhadDepartment of Chemistry, Faculty of Science, Shiraz University, Zip code 71454, Shiraz, I.R. IRANReza Fareghi AlamdariDepartment of Chemistry, Faculty of Science, Shiraz University, Zip code 71454, Shiraz, I.R. IRANJournal Article19970302<em>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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201Multinuclear Variable Temperature NMR Studies on Cyanide, Water and Hydroxyl Group Scrambling on Halogenation of K2[Pt(CN)4] and Related Reactions61651029710.30492/ijcce.1998.10297ENJavad SabouncheiDepartment of Chemistry, Faculty of Science, Bu-Ali-Sina University, Zip code 65174, Hamadan, I.R. IRANSadegh SalehzadehDepartment of Chemistry, Faculty of Science, Bu-Ali-Sina University, Zip code 65174, Hamadan, I.R. IRANJournal Article19960920<em><sup>195</sup></em><em>Pt and <sup>1</sup>H NMR has been used to show that addition of chlorine and bromine to [Pt(CN)<sub>4</sub>]<sup>2_</sup> in presence of perchloric acid in water results in cyanide and water scrambling with formation of eleven complexes of the type [Pt(CN)<sub>4-n</sub>Cl(H<sub>2</sub>O)<sub>n+1</sub>]<sup>(n-1)+</sup> (n=0, 1, 2, 3, 4). Addition of NBu<sub>4</sub>OH to this solution gives (NBu<sub>4</sub>)<sub>2</sub>[Pt(CN)<sub>4</sub>Cl(OH)]. NMR measurements in acetone also show cyanide and hydroxyl group scrambling with formation of complexes of the type [Pt(CN)<sub>4-n</sub>Cl(OH)<sub>n+1</sub>]<sup>2-</sup>, (n=0, 1, 2, 3, 4).</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201Nitroimidazoles XIII. Synthesis of Substituted (1-Methyl-5-Nitro-2-Imidazolyl) Isoxazoles66691030010.30492/ijcce.1998.10300ENAbbas ShafieeDepartment of Chemistry, Faculty of Pharmacy, The Medical Science University of Tehran, Zip code 14174, Tehran, I.R. IRANMohammad ALi EbrahimzadehDepartment of Chemistry, Faculty of Pharmacy, The Medical Science University of Tehran, Zip code 14174, Tehran, I.R. IRANJournal Article19970511<em>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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201A Simple Method for Evaluating the Cleaning Power of Commercial Detergents70721030110.30492/ijcce.1998.10301ENMohammad Chalkosh AmiriDepartment of Chemical Engineering, Isfahan University of Technology, Zip code 84156, Isfahan, I.R. IRANJournal Article19960425<em>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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201Optimizing of SCP Production from Sugar Beet Stillage Using Isolated Yeast73801030510.30492/ijcce.1998.10305ENSeyed Abbas ShojaosadatiBiotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, I.R. IRANRasoul KhalilzadehBiotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, I.R. IRANHamid Reza SanaeiScience and Technology Research Center, Tehran, I.R. IRANJournal Article19970525<em>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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201A New Mixing Rule for Mixtures of Hard Spheres81881030310.30492/ijcce.1998.10303ENMohsen Mohsen NiaDepartment of Chemical Engineering, Amir-Kabir University of technology, Tehran, I.R. IRANHamid ModarresDepartment of Chemical Engineering, Amir-Kabir University of technology, Tehran, I.R. IRANGholam Ali MansooriDepartment of Chemical Engineering, University of Illinois at Chicago, USAJournal Article19961201<em>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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998617219981201The Liquid Density of Complex Liquid Mixtures89931030410.30492/ijcce.1998.10304ENMohammad Hossein KeshavarzDepartment of Chemistry, Malek Ashtar University of Technology, Zip code 83158, Isfahan, I.R. IRANAli BoushehriDepartment of Chemistry, Shiraz University, Zip code 71454, Shiraz, I.R. IRANJournal Article20051104<em>A second virial coefficient correlation suitable for two different temperatures ranges, (T*)<sup>-2</sup></em><em>£</em><em>180 and (T*)<sup>-2</sup>>180, where T* is RT/</em><em>D</em><em>H<sub>vap</sub> 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 T<sub>tp</sub> to T<sub>c</sub> 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%.</em>