Time filter

Source Type

Pourreza N.,Shahid Chamran University | Sharifi H.,Shahid Chamran University | Golmohammadi H.,Shahid Chamran University | Golmohammadi H.,ACECR Production Technology Research Institute
Microchemical Journal | Year: 2016

In the current work, the enriched curcumin nanoparticles (CURNs) in nonionic surfactant phase in the presence of Fe3 + has been utilized for colorimetric recognition of citrate ions. The absorption intensity of CURN-Fe3 + complex transferred into the surfactant rich phase is decreased upon the addition of citrate ion owing to its interaction with citrate ions and consequently the formation of new complex (CURN-Fe3 +-citrate). This decrease in the absorption intensity of surfactant rich phase is proportional to the citrate concentration and was utilized for colorimetric sensing of citrate ions. The reaction conditions such as pH of the sample solution, concentration of Fe3 +, electrolyte and CURNs were appraised and optimized. Under the optimum experimental conditions, the proposed method demonstrated two linear calibration intervals in the concentration ranges of 3–100 ng mL− 1 and 100–600 ng mL− 1 of citrate with a detection limit of 1.7 ng mL− 1. The relative standard deviations (RSD) of 2.91% and 0.97% for 8 replicated measurements of 10 ng mL− 1 and 400 ng mL− 1 of citrate, respectively, indicate that developed method has good reproducibility. Eventually, the practical efficiency of the developed method was demonstrated to the analysis of citrate in lemon juice and pharmaceutical samples with satisfactory results. © 2016 Elsevier B.V.

Abdollahi N.,Shahid Chamran University | Kiasat A.R.,Shahid Chamran University | Saghanezhad S.J.,ACECR Production Technology Research Institute
Revue Roumaine de Chimie | Year: 2016

(Image presented) Melamine sulfonic acid supported Fe3O4 magnetic nanocomposite, Fe3O4@MSA, has been prepared and successfully applied as a solid acid catalyst for one-pot three-component condensation reaction of aldehyde, β-ketoester and urea or thiourea under solvent free conditions. The nanocomposite has been characterized by FT-IR, TGA and SEM spectroscopies. The nanomagnetic catalyst could be readily separated via application of an external magnet, allowing straightforward recovery and reuse.

Ebrahimi M.,ACECR Production Technology Research Institute
Society of Petroleum Engineers - Trinidad and Tobago Energy Resources Conference 2010, SPE TT 2010 | Year: 2010

Gas lift is an artificial lift technique used to increase oil wells flow rate. In this method, high pressure gas is injected into the well oil column to reduce its average density and make it flow to the surface. The main objective in gas lift system design is to obtain the optimum gas injection rate. Obtaining the optimum gas injection rate is important because excessive gas injection will reduce production rate and also increase the operation cost. Some other parameters are also important in a successful gas lift operation that if not chosen properly, make the operation impossible or at least uneconomical; namely gas injection pressure, well head pressure, depth of operating and unloading valves, valves spacing, etc. Field A, located in south-western Iran, has been producing oil for more than 60 years. Through that period, the early average oil production rate of 20 MSTB/D for each well has dropped severely by a factor of 8. At present, the field produces 185 MSTB/D through 73 active oil wells. However, the high reservoir pressure drop and continuous increase of water cut and gas oil ratio through the years, have influenced some of the wells to a greater extent such that the oil does not flow or flows at a lower rate than that of scheduled. In this paper, nodal analysis is used to compare and analyze the effects of different parameters on a sample well production. Firstly, a model is constructed and matched with the real data and thereby the best fluid and well production correlations are selected. Secondly, Sensitivity analysis tests are performed and the results are compared. Finally, the optimum parameters are chosen considering economical aspects. By applying the stated optimizations of this paper, the flow rate can be increased by 80%. © 2010, Society of Petroleum Engineers.

Heli B.,Catalan Institute of Nanoscience and Nanotechnology | Heli B.,Ecole Polytechnique de Montréal | Morales-Narvaez E.,Catalan Institute of Nanoscience and Nanotechnology | Golmohammadi H.,ACECR Production Technology Research Institute | And 2 more authors.
Nanoscale | Year: 2016

The localized surface plasmon resonance exhibited by noble metal nanoparticles can be sensitively tuned by varying their size and interparticle distances. We report that corrosive vapour (ammonia) exposure dramatically reduces the population density of silver nanoparticles (AgNPs) embedded within bacterial cellulose, leading to a larger distance between the remaining nanoparticles and a decrease in the UV-Vis absorbance associated with the AgNP plasmonic properties. We also found that the size distribution of AgNPs embedded in bacterial cellulose undergoes a reduction in the presence of volatile compounds released during food spoilage, modulating the studied nanoplasmonic properties. In fact, such a plasmonic nanopaper exhibits a change in colour from amber to light amber upon the explored corrosive vapour exposure and from amber to a grey or taupe colour upon fish or meat spoilage exposure. These phenomena are proposed as a simple visual detection of volatile compounds in a flexible, transparent, permeable and stable single-use nanoplasmonic membrane, which opens the way to innovative approaches and capabilities in gas sensing and smart packaging. © 2016 The Royal Society of Chemistry.

Kiasat A.R.,Shahid Chamran University | Chadorian F.,Shahid Chamran University | Saghanezhad S.J.,ACECR Production Technology Research Institute
Comptes Rendus Chimie | Year: 2015

β-Azidoalcohols, β-cyanohydrins, and β-acetoxy alcohols have been synthesized in the presence of a Fe3O4@SiO2/bipyridinium nanocomposite (Fe3O4@SiO2/BNC) as a novel magnetic and recyclable phase-transfer catalyst (PTC) in water. The catalyst was characterized with FT-IR, SEM, XRD, VSM, and TGA. This methodology offers several advantages, including easy work-up procedure, excellent regioselectivity, high yields, short reaction times, recyclable catalyst, easy separation of the catalyst through an external magnet and eco-friendly procedure. © 2015 Académie des sciences.

Saghanezhad S.J.,ACECR Production Technology Research Institute | Sayyahi S.,Islamic Azad University at Mahshahr
Research on Chemical Intermediates | Year: 2016

Abstract: Caffeine-H2SO4 was prepared as a novel dual acidic catalyst. The catalytic activity of caffeine-H2SO4 was evaluated in one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones. The catalyst was also characterized by Fourier-transform infrared (FT-IR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and thermogravimetric analysis (TGA). According to the obtained results including reaction time, yield, and recyclability, caffeine-H2SO4 can be considered an efficient catalyst for organic transformations. Graphical Abstract: One-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones[Figure not available: see fulltext.] © 2016 Springer Science+Business Media Dordrecht

Amini A.,Islamic Azad University at Mahshahr | Sayyahi S.,Islamic Azad University at Mahshahr | Saghanezhad S.J.,ACECR Production Technology Research Institute | Taheri N.,Islamic Azad University at Mahshahr
Catalysis Communications | Year: 2016

The present work trends to define an efficient phenacyl catalytic synthesis method employing a new nano-magnetite-supported organocatalyst. Polyethylene glycol (PEG) was bonded successfully onto silica coated ferrite and the resultant nanoparticles (PEG@SiO2@Fe3O4) characterized by fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), thermal gravimetric analysis (TGA), vibrating sample magnetometry (VSM), energy dispersive X-ray analysis (EDAX) and X-ray diffraction (XRD) that exhibited a good catalytic activity in the reaction. The nanoparticles could be easily separated from the reaction mixture by an external magnet and reused in seven reaction cycles without significant loss of activity. © 2016 Elsevier B.V. All rights reserved.

Ebrahimi M.,ACECR Production Technology Research Institute
Society of Petroleum Engineers - Trinidad and Tobago Energy Resources Conference 2010, SPE TT 2010 | Year: 2010

The main difficulty usually encountered in gas-condensate reservoirs is the loss of valuable condensed liquid in the reservoir due to capillary forces, a phenomenon called condensate blockage. The presence of condensates when coupled with the complexity of fluid flow in fractured reservoirs can increasingly obscure the expected performance of such reservoirs. A thorough understanding of the factors leading to condensate buildup in fractured reservoirs is crucial for deciding a proper strategy to exploit such reservoirs. In this paper, a compositional model is used to predict and physically justify the single-well performance of a naturally fractured gas-condensate reservoir having different reservoir properties and production schemes. The current study reveals the important role of capillary pressure in trapping condensates, especially in highly fractured reservoirs where the effect of gravity drainage is minimized. Higher matrix block sizes can reduce the amount of trapped liquid. However, high critical condensate saturation can dampen the effect to some extent. Pore size uniformity is another important factor that causes less condensate buildup due to less capillary pressure. Higher production rates result in earlier condensate dropout peak. The peak is lower for higher rates, a phenomenon attributed to velocity stripping. Furthermore, the effect of gas and liquid diffusion is the most crucial in tighter matrices and can significantly reduce the trapped condensates. © 2010, Society of Petroleum Engineers.

Ebrahimi M.,ACECR Production Technology Research Institute
Society of Petroleum Engineers - Trinidad and Tobago Energy Resources Conference 2010, SPE TT 2010 | Year: 2010

Traditional decline curve analysis is an empirical procedure used mainly to predict recoverable reserves and future production rates, based on the boundary dominated declining rate. Modern (typecurve) analysis, however, are partially (Fetkovich) or fully derived analytically, based on reservoir fluid flow equations and assuming some simplifying conditions. Such typecurves are generally used for predicting reserves and future production rates as well as reservoir parameters. In the current study, two cases have been analyzed using traditional and modern decline curves in an attempt to estimate key reservoir parameters. In the first case, an implicit reservoir simulator has been used for generating a set of declining rates for a well operating at ideal conditions, i.e. a homogenous cylindrical reservoir with isotropic permeability producing single phase oil at a constant bottomhole pressure. The generated data ware then used as an input for a decline curve analysis software to investigate the reliability and accuracy of estimated permeability, skin, and drainage area. In the second case, the declining rate of a real oil well is analyzed in terms of the previously cited parameters by the same software. The results of both cases indicate a good agreement between the actual and estimated parameters, with the Blasingame typecurve as the most accurate decline curve analysis technique. © 2010, Society of Petroleum Engineers.

Saghanezhad S.J.,ACECR Production Technology Research Institute | Nazari Y.,Kimia Kankash Jondishapur Research Co. | Davod F.,ACECR Production Technology Research Institute
RSC Advances | Year: 2016

Cucurbit[6]uril-OSO3H (CB[6]-OSO3H) has been prepared and used as an efficient acidic nanocatalyst for the one-pot preparation of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes. The nanocatalyst was characterized by FT-IR, AFM, TEM, and TGA analyses. This green protocol is catalyzed by CB[6]-OSO3H, and proceeds efficiently in the absence of any organic solvent under optimized, mild, green and environmentally benign reaction conditions in high yields and within a short reaction time. © The Royal Society of Chemistry 2016.

Loading ACECR Production Technology Research Institute collaborators
Loading ACECR Production Technology Research Institute collaborators