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Bahman Zarenezhad,Mona Mottahedin,Ali Haghighi Asl 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
Accurate prediction of phase equilibria regarding CH_4 replacement in hydrate phase with high pressure CO_2 is an important issue in modern reservoir engineering. In this work we investigate the possibility of establishing a thermodynamic framework for predicting the hydrate equilibrium conditions for evaluation of CO_2 injection scenarios. Different combinations of equations of state and mixing rules are applied and the most accurate thermodynamic models at different CO_2 concentration ranges are proposed.
Hadi Share Mohammadi,Ali Haghighi Asl,Maryam Khajenoori 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
To improve the bioavailability of ampicillin trihydrate (AMP) as a poorly water-soluble drug, the nanonization of AMP particles was carried out by solvent anti-solvent precipitation for the first time. In this method the subcritical water (SW) and cold water at ambient conditions were utilized as the solvent and anti-solvent, respectively. At first, the solubility of AMP in SW was measured. The solubility of AMP in SW at a constant pressure of 5MPa and the temperature range from 303.15 to 403.15 K was found to range from 0.380×103 to 17.689×103 mole fractions. The effects of three independent variables, including SW temperature, polyethylene glycol concentration, and anti-solvent temperature, on the particle size and morphology of the precipitated nanoparticles were studied. The obtained results of analyses confirmed that the AMP particles were nanosized to the smallest mean size of 66.5 nm using an environmentally friendly method without the requirement of organic solvents and related post-processing purification stages.
Hadi Baseri,Mohammad Nader Lotfollahi,Ali Haghighi Asl 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.1
An equation of state (EOS), which is based upon contributions to the Helmholtz energy, is presented for systems containing aqueous electrolyte solutions at high pressure. The Peng-Robinson equation of state is used to provide the Helmholtz energy of a reference system. The electrolyte terms consist three terms containing a modified Debye- Hückel term for long-range electrostatic interactions, the Born energy contribution for electrostatic works and a Margules term for short-range electrostatic interactions between ions and solvents. The binary and ternary interaction parameters of the equation of state are obtained by experimental osmotic coefficient data. Systems that were studied here are (water+ NaCl+SC-CO2), (water+NH4Cl+SC-CO2), (water+Na2SO4+SC-CO2) and (water+methanol+NaCl+SC-CO2). It is found that the proposed equation of state is able to accurately represent the experimental data over a wide range of pressure, temperature and salt concentration.
Jafar Mahmoudi,Mohammad Nader Lotfollahi,Ali Haghighi Asl 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Benzene reduction in gasoline was investigated with propylene over synthesized mesoporous H-Al- MCM-41 with Si/Al = 15, 29 and 42 as catalysts in order to produce more environmental friendly gasoline. The resulting catalysts were characterized by XRF, XRD, FTIR, TGA, BET and TPD-NH3 techniques. The results of alkylation of C6-cut obtained from gasoline indicated that the synthesized mesoporous H-AL-MCM-41 with Si/Al = 15 is the most active catalyst among the synthesized catalysts due to high crystallinity, favorable textural properties and large bronsted acidity. The higher conversion of benzene (47.88%) was observed over H-Al-MCM-41 with Si/Al = 15 at B/P = 1 and T = 200 8C.
Mohammad Saber Karambeigi,Masoud Nasiri,Ali Haghighi Asl,Mohammad Ali Emadi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
The positive feedback from previous studies has confirmed the high performance of microemulsionflooding. However, there are few researches assessing this efficient method in carbonates reservoirs,particularly at high temperature. This paper attempts to fill the gap. Furthermore, biodiesel is introducedand evaluated as a new hydrocarbon source of mixture. For this purpose, phase behavior of surfactant/brine/biodiesel/co-solvent was systematically studied using response surface methodology to find theoptimum formulation. Thereafter, optimized microemulsion was characterized in terms of particle sizedistribution, zeta potential, electrical conductivity, polarized light microscopy, surface tension,interfacial tension, and viscosity. Finally, oil recovery tests comprising spontaneous imbibition, contactangle, core-flood and microvisual experiments were conducted to examine the potential of optimumformulation for chemical enhanced oil recovery (CEOR) purpose in carbonates. Experiments of differentstages were carried out at elevated temperature (75 8C). Employing optimal microemulsion, 20.0%original oil in place (OOIP) in spontaneous imbibition and 6.4% OOIP in core-flood tests were tertiaryadded to oil recovery. The results of this study illustrate the efficacy of proposed formulation to increaseoil recovery factor of carbonate formations.