Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Study of Silanolate Groups (SiO-) in Synthesis of Micelle Templated Silica with Various Condition of Cationic Surfactant16692710.30492/ijcce.2008.6927ENAlireza BadieiSchool of Chemistry, University College of Science, University of Tehran, I.R. IRANRazieh VahidifarSchool of Chemistry, University College of Science, University of Tehran, I.R. IRANAbed HasheminasabSchool of Chemistry, University College of Science, University of Tehran, I.R. IRANJournal Article20060218<em>Based on the {S<sup>+</sup>, I</em><em><sup>-</sup></em><em>} pathway, the concentration of surfactant and surface charge density of silanolate groups control the phase transition from lamellar, to hexagonal through cubic form. The high surface charge density of silanolate groups was observed for the lamellar phase. With decrease of molar concentration of surfactant on the gel, the yield of reaction decreases and the stability of mesophase increase. The silanolate groups of surface are approximately constant when the hydrocarbon length chain of surfactant changes. The disorder mesophase forms for surfactant with short hydrocarbon length chain and the surface charge density decreases. The yield of reaction decreases with decrease of hydrocarbon length chain of surfactant.</em>https://ijcce.ac.ir/article_6927_ab9ecc76cc8da019da1b8b57bf2f3f0e.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Determination of Surface Tension and Viscosity of Liquids by the Aid of the Capillary Rise Procedure Using Artificial Neural Network (ANN)715692810.30492/ijcce.2008.6928ENSamad AhadianDepartent of Polymer and Color Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANSiamak MoradianDepartent of Polymer and Color Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANMohsen MohseniDepartent of Polymer and Color Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANMohammad Amani TehranDepartment of Textile Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANFarhad SharifDepartent of Polymer and Color Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANJournal Article20060414<em>The present investigation entails a procedure by which the surface tension and viscosity of liquids could be redicted.</em><em>To this end, capillary experiments were performed for porous media by utilizing fifteen different liquids and powders. The time of capillary rise to a certain known height of each liquid in a particular powder was recorded. Two artificial neural networks (ANNs) were designed and used to separately predict the surface tension and the viscosity of each liquid respectively. The surface</em><em>tension predictor</em><em>network had six inputs, namely:</em><em>particle</em><em>size,</em><em>bulk density, packing density and surface free energy of the powders as well as the density of the probe liquids together with the capillary rise time of the liquids in the corresponding powders. The viscosity predictor network had surface tension as an extra input. In order to correlate the surface tension and viscosity as predicted by the corresponding artificial neural network to their experimentally determined equivalents, two different statistical parameters namely the product moment correlation coefficient (r<sup>2</sup>) and the performance factor (PF/3) were used. It must be noted that for a perfect correlation r<sup>2</sup> = 1 and PF/3 = 0. The results of the present work clearly showed that the artificial neural network approach is able to predict the surface tension (i.e. r<sup>2</sup> = 0.95, PF/3 = 16) and viscosity (i.e. r<sup>2</sup> = 0.998 , PF/3 = 13) of the probe liquids with unsurpassed accuracy.</em> https://ijcce.ac.ir/article_6928_3b9c25207b8ea6b3c94b50c452984cea.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Synthesis of Enaminones and Their Reaction with Dimethyl Acetylene Dicarboxylate1723700810.30492/ijcce.2008.7008ENShahram MoradiFaculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I.R. IRANFarhad Rajabi MehrFaculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I.R. IRANAfrooz BaharvandFaculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I.R. IRANCobra RostamiFaculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I.R. IRANJournal Article20061002In present paper a simple procedure for the synthesis of enaminones without catalyst from 1,3-diketones that reacted with primary or secondary amines in ethanol as solvent, as well as the reaction of enaminones with unsaturated esters such as dimethyl acetylene dicarboxylate are reported.https://ijcce.ac.ir/article_7008_e7e055ddbadcdf4140e05f282ba7435c.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Application of Genetic Algorithm in Kinetic Modeling of Fischer-Tropsch Synthesis2534700910.30492/ijcce.2008.7009ENMohammad MasooriDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANRamin Bozorgmehry BoozarjomehryDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANMaryam Sarnavi JMinistry of Education, Khoram Abad, Lorestan, I.R. IRANNafise ReshadiDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANJournal Article20060730<em>Kinetic modeling is an important issue, whose objective is the accurate determination of the rates of various reactions taking place in a reacting system. This issue is a pivotal element in the process design and development particularly for novel processes which are based on reactions taking place between various types of species. The Fischer Tropsch (FT) reactions have been used as the kinetic modeling bench mark. General kinetic models for FT, Water-Gas-Shift (WGS) and overall rates based on Langmuir-Hinshelwood-Hougen-Watson (LHHW) type have been considered and their optimum parameters have been obtained by Genetic Algorithms. The study shows the obtained model outperforms the other alternative models both in generality and accuracy. Due to flexibility and generality of Genetic Algorithms, it seems that GA is a useful technique with lots of potentials in determination of optimum kinetic model corresponding to a set of complex reactions.</em>https://ijcce.ac.ir/article_7009_8ab018bafe3cbb261f4586566add93d6.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Effect of Fracture Spacing on VAPEX Performance in Heavy Oil Fracture Systems3545701010.30492/ijcce.2008.7010ENReza AzinDepartment of Chemical Engineering, Persian Gulf University, Bushehr 75169, I.R. IRANRiyaz KharratPetroleum University of Technology, Petroleum Research Center, Tehran, I.R. IRANCyrus GhotbiDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANShapour VossoughiDepartment of Chemical and Petroleum Engineering, Kansas University, KS, USAJournal Article20060803<em>The vapor extraction (VAPEX) process, a solvent-based enhanced oil recovery process has been found promising for some heavy oil reservoirs. In this work, the VAPEX process is studied using a compositional simulator on a number of single-block and multiple block fractured systems. PVT data of one of an Iranian heavy oil reservoir are used to tune the equation of state. Effects of fracture spacing on the performance of process were studied. It was found that the fracture network enhances the VAPEX process in low-permeability systems by increasing the contact area between solvent and oil contained in the matrix blocks. Also, the fracture network reduced the instabilities in the system pressure and damped pressure surges in the system during the VAPEX process. In addition, results showed that solvent traverse between fracture network delayed the onset of solvent breakthrough and provided more residence time for the solvent to be in contact with heavy oil. In other part, effect of well location on the performance of process was studied. It was found that the oil production decreased as the well spacing increased. When the injection and production wells were far from each other, the oil production was governed by displacement for quite a long time rather than the gravity drainage enhanced by the VAPEX process. Also, improper location of the injection and production wells may results in the shortcut between injector and producer, which would lead to early solvent breakthrough and increased gas production through the system. The well location is a critical issue when applying the VAPEX process in fractured systems.</em>https://ijcce.ac.ir/article_7010_4320b02fb5a470c85abdb14da4f692ac.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Influence of Different Nitrogen Sources on Amount of Chitosan Production by Aspergillus niger in Solid State Fermentation4752701110.30492/ijcce.2008.7011ENVida MaghsoodiBiochemical and Bioenvironmental Engineering Research Center, Sharif University of Technology, Tehran, I.R. IRANSoheila YaghmaeiDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANSayed Mohammad BeigiDepartment of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRANJournal Article20061009<em>In this study the effect of different nitrogen source substrates on the amount of chitosan production by Aspergillus niger was investigated. </em><em>A</em><em>. niger PTCC 5012</em> <em>from the Persian Type Culture Collection (PTCC) was grown on soy bean, corn seed and canola residues at 30 °C for specified</em><em> cultivation</em><em> days under sterilized condition</em><em>s</em><em>. Chitosan was extracted from the fungal mycelia using hot alkaline and acid treatment. The results were shown that soy bean residue at moisture of 37% and 8.4</em><em>0.26 % of nitrogen content produced the highest amount of chitosan (17.053</em><em>0.95</em><em> g/kg of dry substrate), after 12 days of incubation. Corn seed residue produced very low amount of chitosan (1.9</em><em>0.4 % of nitrogen conten</em><em>t</em><em>). The chitosan was analyzed by FTIR spectroscopy and its spectrum was recorded. </em>
https://ijcce.ac.ir/article_7011_2524a20030058d078dd2dac2cb38e252.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Numerical Modelling of Porous Radiant Burners Using Full and Reduced Kinetics Mechanisms5363701210.30492/ijcce.2008.7012ENMostafa Khosravy El-HossainiDepartment of Mechanical Engineering, Faculty of Engineering, Tarbiat Modares University,
P.O. Box 14115-111 Tehran, I.R. IRANMehdi MaerefatDepartment of Mechanical Engineering, Faculty of Engineering, Tarbiat Modares University,
P.O. Box 14115-111 Tehran, I.R. IRAN0000-0003-4473-1561Kiumars MazaheriDepartment of Mechanical Engineering, Faculty of Engineering, Tarbiat Modares University,
P.O. Box 14115-111 Tehran, I.R. IRANJournal Article20060930<em>The present paper compares full kinetics mechanisms in numerical modelling of porous radiant burners (PRB), with their reduced forms. The two most frequently used mechanisms of methane combustion (GRI3.0 and Miller) were selected and their effects were examined on temperature, species concentration, burning speed, and pollutant emission. While the findings of numerical simulation of PRB show fine concurrence between each full mechanism and its related reduced mechanism, no significant temperature differences are observed in the results of full mechanisms. However, CO concentration along burner axis shows a small difference between two full mechanisms, which is related to HCO and HO<sub>2</sub> concentrations. The inconsistency is more pronounced for NO concentration along porous axis, which is due to prompt NO evaluation. The present research finds deviation also between burning speeds, calculated by numerical simulation and experimental results. This difference is much more significant in rich mixtures. GRI3.0 mechanism estimated the burning velocities as closer to the experimental values than those predicted using Miller mechanism.</em> https://ijcce.ac.ir/article_7012_446b9949155fed97f85b8a16a937f589.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Diagnosis of Heat Exchanger Scales in Cooling Water Systems6572701310.30492/ijcce.2008.7013ENMohammad KameliChemical and Petrochemical Division, Research Institute of Petroleum Industry,
P.O. Box: 18745-4163 Tehran, I.R. IRANNaser EsmaeiliChemical and Petrochemical Division, Research Institute of Petroleum Industry,
P.O. Box: 18745-4163 Tehran, I.R. IRANHossein Rahimi MofradChemical and Petrochemical Division, Research Institute of Petroleum Industry,
P.O. Box: 18745-4163 Tehran, I.R. IRANJournal Article20061112<em>An experimental database is compiled in order to fingerprint the scales formed over the hot surfaces of heat exchangers, in cooling water systems or other systems with similar chemistry. To collect these data, a dynamic simulating pilot plant was designed with considerable application flexibility among which simultaneous flow of water with different velocity and heat fluxes to three simulating heat exchangers can be mentioned. Changing the water chemistry and using various inhibitors composition known in the art, the nature of scale deposits formed on the heating elements was studied by scanning electron microscopy (SEM) coupled with Energy Dispersive X-ray instrument. The heat flux of the elements ranges from 9.46 × 10<sup>4</sup> to 1.45 × 10<sup>5</sup> J/m<sup>2</sup>.sec, which depending on the velocity of fluid passing through the orifice of pipe, give rise to skin temperatures of 80 °C to 230 °C. The flow velocities used in this study were 0.21 and 0.46 m/sec. Phosphonates and most popular polymers were studied as scale inhibitors.</em>
https://ijcce.ac.ir/article_7013_2e5377fb330b63ec5924c6c1ce4ffa08.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301A Comprehensive Comparative Investigation of Compressed Natural Gas as an Alternative Fuel in a Bi-Fuel Spark Ignition Engine7383701410.30492/ijcce.2008.7014ENAmir Hossein ShamekhDepartment of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, I.R. IRANNima KhatibzadehDepartment of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, I.R. IRANAbazar ShamekhiDepartment of Mechanical Engineering, University of Tehran, Tehran, I.R. IRANJournal Article20061219<em>Nowadays, increased attention has been focused on internal combustion engine fuels. Regarding environmental effects of internal combustion engines particularly as sources of pollution and depletion of fossil fuels, compressed natural gas has been introduced as an alternative to gasoline and diesel fuels in many applications. A high research octane number which allows combustion at higher compression ratios without knocking phenomenon and with good emission characteristics of unburned hydrocarbons and carbon monoxide are major benefits of compressed natural gas as an engine fuel. In this paper, natural gas as an alternative fuel in a spark ignition engine, has been considered. Engine performance and exhaust emissions have been experimentally studied for both natural gas and gasoline fuels in a wide range of engine operating conditions.</em>
https://ijcce.ac.ir/article_7014_b9126d5718cf1d7e9ae3bfcf8d8e9d09.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Synthesis of Ammonium Dinitramide by Nitration of Potassium and Ammonium Sulfamate. The Effect of Sulfamate Conterion on ADN Purity8589712810.30492/ijcce.2008.7128ENGholam Hossein NazeriAdvanced Material’s Research Center, P.O. Box 16765-3574 Tehran, I.R. IRANRamin MastourAdvanced Material’s Research Center, P.O. Box 16765-3574 Tehran, I.R. IRANMohammad FayazniaAdvanced Material’s Research Center, P.O. Box 16765-3574 Tehran, I.R. IRANParviz KeyghobadiAdvanced Material’s Research Center, P.O. Box 16765-3574 Tehran, I.R. IRANJournal Article20060709<em>Nitration of potassium sulphamate was carried out using a mixture of sulphuric and nitric acid at -30 °C. The reaction time was optimized at the mole ratio of sulphuric to nitric acid of (1:3.5). The difference in product yield by changing the potassium to ammonium sulphamate was studied throughly. It was found that both the yield and purity of the product is better starting with potassium sulphamate.</em>https://ijcce.ac.ir/article_7128_95472a7cb423c8056ae145c7e55316c9.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Application of Plackett Burman Design for Citric Acid Production from Pretreated and Untreated Wheat Straw91104712910.30492/ijcce.2008.7129ENKianoosh Khosravi DaraniDepartment of Food Technology Research, National Nutrition and Food Technology Research Institute, Shaheed Beheshti University, M.C., P.O. Box 19395 Tehran, I.R. IRAN0000-0002-0269-6385Alale ZoghiDepartment of Chemical Engineering, Faculty of Engineering, Azad Islamic University, Science and Technology Campus, P.O. Box 14115-775 Tehran, I.R. IRANSayed Abolhasan AlaviDepartment of Chemical Engineering, Faculty of Engineering, Azad Islamic University, Science and Technology Campus, P.O. Box 14115-775 Tehran, I.R. IRANSayed Safa Ali FatemiDepartment of Bioprocess Engineering, National Institute for Genetic Engineering and Biotechnology, P.O. Box 14965-161 Tehran, I.R. IRANJournal Article20061216<em>A solid state fermentation method was used to utilize wheat straw as substrates for citric acid production by using Aspergillus niger </em><em>ATCC </em><em>9142. The Plackett Burman design (PBD) of experiments was used to test the relative importance of t</em><em>he variables affecting production such as moisture content, age of spore, inoculum size, initial pH of substrate, methanol concentration, incubation temperature and time, as well as initial sugar concentration, steam time and type of solvent. In best condition, the microorganism produced 47 g citric acid per kg dry crude wheat straw, with yield of 93 % based on the amount of fermentable sugar consumed. The effect of pretreatment of wheat straw with HCl, NaOH and urea on the yield of production was also investigated by using </em><em>PBD</em><em>. Acid, alkaline and urea pretreatment of wheat straw increased citric acid concentration to 115, 85.0 and 109.5 g/kg of dry wheat straw and yield to 97, 97 and 96 % (respectively) based on available sugar consumed. Finally, up scaling was achieved to a 20-L solid state fermentor (tray bioreactor) in which moisture was constant in gas phase and acid pretreated wheat straw was selected as the most efficient pretreated substrate. The produced acid concentration and yield in fermentor was 60.53 g/kg of dry wheat straw and 2.11 g/kg.day, respectively.</em> https://ijcce.ac.ir/article_7129_0608f08afa7398a38d5a55e784e1738f.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Synthesis of Pyrrole Phosphonate Esters: Emphasis on Pyrrole NH Acids and Dialkylacetylenic Esters Substitution105113713010.30492/ijcce.2008.7130ENMalek Taher MaghsoodlouDepartment of Chemistry, University of Sistan & Baluchestan, P.O. Box 98135-674 Zahedan, I.R. IRANFaramarz Rostami CharatiHigh Education Center, Gorgan University of Agricultural Sciences and Natural Resources,
P.O.Box 163, Gonbad, I.R. IRANSayed Mostafa Habibi KhorassaniDepartment of Chemistry, University of Sistan & Baluchestan, P.O. Box 98135-674 Zahedan, I.R. IRANMaryam KhosroshahrodiDepartment of Chemistry, University of Sistan & Baluchestan, P.O. Box 98135-674 Zahedan, I.R. IRANJournal Article20070119<em>Reaction of dialkyl acetylenedicarboxylates 1a-c andpyrrole derivatives 2a-e in the presence of triphenylphosphite (TPP) was investigated and the effect of the pyrrole substitution was established. Diastereoselectivity is observed with pyrroles, 2a,b, yieldingphosphonate ester derivatives 3a-f and 4,and their relative configuration is determined by <sup>1</sup>H/<sup>13</sup>C and <sup>31</sup>P NMR and confirmed by single X-ray diffraction. Similar reactions with higher degree of substitution of the pyrrole, 2c,e showed no diastereoselectivity.</em>
https://ijcce.ac.ir/article_7130_69257fdfcd468c9d87171195310c7921.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Fabrication of a Sulfite Biosensor by the Use of Conducting Polymer115121713210.30492/ijcce.2008.7132ENMohammad HosseiniDepartment of Chemical Engineering, Amirkabir University of Technology,
P.O. Box 15874-4413 Tehran, I.R. IRANBaharak BahmaniDepartment of Biomedical Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANFatollah MoztarzadehDepartment of Biomedical Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANMohammad RabieeDepartment of Biomedical Engineering, Amirkabir University of Technology,
P.O. Box 15875-4413 Tehran, I.R. IRANJournal Article20070127<em>In this research, an enzyme modified electrode has been produced during the electropolymerization of aniline through incorporation of sulfite oxidase into a conducting polymer. Then the bioelectrochemical response of resulted sulfite biosensor was investigated at different experimental conditions. Study of the stability of the resulted sulfite biosensor revealed that formation of a passive film on the aluminum surface causes improved stability of the electroactive films formed on the electrode surface. The bioelectrochemical response of the enzyme-modified electrode as a sulfite biosensor was investigated at different experimental conditions. The optimum pH and temperature were 8.5 and 35</em><em>°</em><em>C, respectively. The apparent Michaelis-Menten constant and the activation energy of the enzyme catalyzed reaction were calculated.</em>https://ijcce.ac.ir/article_7132_d5c60d14f7a56824ba461c2e2ae9756a.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Preparation of Sulfur Mortar from Modified Sulfur123127713310.30492/ijcce.2008.7133ENNarmin Bahrami AdehInorganic Chemical Industries Research Group, Iranian Research and Development Center for Chemical Industries (IRDCI), P.O. Box 13145-1494 Tehran, I.R. IRANMitra Mohtadi HaghighiInorganic Chemical Industries Research Group, Iranian Research and Development Center for Chemical Industries (IRDCI), P.O. Box 13145-1494 Tehran, I.R. IRANNahid Mohammad HosseiniInorganic Chemical Industries Research Group, Iranian Research and Development Center for Chemical Industries (IRDCI), P.O. Box 13145-1494 Tehran, I.R. IRANJournal Article20061105<em>Mixtures of mineral aggregate and modified sulfur, wherein the modified sulfur functions as a binder, are termed sulfur concretes or sulfur mortars depending on the form of the mineral aggregate. Molten sulfur reacted with olefinic additive, at 130-140 ºC, and then mixed with preheated filler and aggregates. Sulfur mortar samples were prepared by mixing 32 % molten sulfur, 10 % filler and 58 % aggregates. The effects of reaction temperature, and heating time, were tested on mechanical properties of sulfur mortar. Sulfur mortars were prepared by silica flour, mica and carbon as filler in which silica flour can reduce odor problems. Sulfur mortar specimens have compressive strength (200-424 kg/cm<sup>2</sup>), tensile strength (more than 80 kg/cm<sup>2</sup>), and flexural strength (110-120 kg/cm<sup>2</sup>).</em>
https://ijcce.ac.ir/article_7133_418adca303175e7057bc527dabb3cfdc.pdfIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-998627120080301Acoustical Studies of Some Derivatives of 4-Amino Benzoic Acid in 1, 4-Dioxane and Dimethyl Formamide at 308.15 K129135713410.30492/ijcce.2008.7134ENShipra BalujaDepartment of Chemistry, Saurashtra University, Rajkot- 360 005, (Gujarat) INDIAJagdish MovaliyaDepartment of Chemistry, Saurashtra University, Rajkot- 360 005, (Gujarat) INDIAJournal Article20060711<em>The ultrasonic velocity, density and viscosity of some Schiff bases of 4-amino benzoic acid were measured in 1,4-dioxane and dimethylformamide at 308.15 K. Various acoustical properties such as isentropic compressibility (</em><em>k</em><em><sub>s</sub></em><em>), Rao’s molar sound function (R<sub>m</sub>), the Van der Waals constant (b), molar compressibility (W), inter molecular free length (L<sub>f</sub>), relaxation strength (r), internal pressure (</em><em>p</em><em>), solvation number (S<sub>n</sub>) etc., were calculated. The results are interpreted in terms of molecular interaction occurring in the solutions.</em>
https://ijcce.ac.ir/article_7134_04a7641fa9c58c37f615a68cb22e3799.pdf