The potential application modified lignin sulfonate matrix to controlled-release urea and predict the release profile
کیوان
شایسته
دانشگاه محقق اردبیلی- دانشکده فنی مهندسی- استادیار گروه مهندسی شیمی
author
نادر
صادقی
دانشگاه محقق اردبیلی
author
text
article
2017
per
The main aim of this paper is to investigate the potential usage of acetylated Lignin sulfonate for controlling urea fertilizer release. Initially, lignin sulfonate was isolated from black liquor, based on precipitation calcium hydroxide. FTIR spectrum of this material showed that it is high soluble in water, due to the large number of hydroxyl groups in its structure. Oxalic acid was used to reduce this biopolymer solubility in water. Different weight ratios of acetylated Lignin sulfonate and urea were melted. After complete mixing, they were poured in the spherical template, to produce spherical granules. In this study, time-release urea increased from about 2 min to 48 hr, for equal weight ratio of acetylated Lignin sulfonate to urea. One analytical model was used to predict the release profile. The results showed that the model could predict the release profile accurately.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
1
9
https://jsse.uk.ac.ir/article_1554_7f764fbc709b00f59a5d0f152184bfe1.pdf
dx.doi.org/10.22103/jsse.2017.1554
Simulation of double-deck vibrating screens based on DEM using PFC3D software
زهرا
فرجی
دانشگاه کاشان
author
اکبر
فرزانگان
دانشگاه تهران
author
text
article
2017
per
Double-deck industrial vibrating screens are extensively used for solid-solid separation based on particle size. Discrete Element Method (DEM) is a numerical simulation approach that can compute interactions between particles, particles and screen surface and their movement. In this article, the results of simulation of particles classification in a 5-panel banana screen with DEM under PFC3D environment is presented. DEM simulations were performed to study the effects of operating conditions and geometry on classification performance. The results previously reported in literature by other researchers were used to validate DEM predications in current research. The mean relative error of partition curves for screen overflow, middlings and underflow were 38.6 %, 16.9 % and 12.8 %, respectively. Given the close agreement between trends of partition curves in previous and current studies, values and sources of prediction errors, the accuracy of performed simulation is evaluated as acceptable.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
11
21
https://jsse.uk.ac.ir/article_1556_4c869fc6e7852a41605407ed6ffe65fa.pdf
dx.doi.org/10.22103/jsse.2017.1556
Experimental Study of Height and Number of Transfer Unit in Rotating Packed Bed and Conventional Column
فریبا
زارعی
فارغ التحصیل کارشناسی ارشد مهندسی شیمی پیشرفته/دانشگاه یاسوج
author
محمود رضا
رحیمی
دانشیار گروه مهندسی شیمی دانشگاه یاسوج
author
سلیمان
مصلح
دانشجوی مقطع دکتری مهندسی شیمی دانشگاه یاسوج
author
text
article
2017
per
Height of transfer unit (HTU) and number of transfer unit (NTU) are important factors to achieve maximum possible efficiency in pecked beds. In this work, in order to eliminate lack of previous studies, HTU and NTU were investigated for many absorption systems, such as CO2-MDEA, CO2-MEA, CO2-AMP, CO2-PZ, CO2-NaOH, and volatile organic compounds including iso propyl alcohol, acetone, ethyl acetate, methanol, ethanol and iso butanol. The effects of various inner packed radius, outer packed radius and height of packed zone, different packing type and contact flow regimes on the height and number of transfer unit were investigated in mentioned systems. The results indicated deep influence of operating parameters on the HTU and NTU in rotating packed bed (RPB). Also, the performance of RPB and conventional packed bed was evaluated. It was found that higher transfer unit and efficiency with lower volume of experimental setup is distinguished factors cause to preferred RPB in comparison to conventional packed beds.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
23
32
https://jsse.uk.ac.ir/article_1557_e7308cd2587c1691aee54ea477ae5b4d.pdf
dx.doi.org/10.22103/jsse.2017.1557
Investigation of petrochemical industries spent caustic wastewater photocatalitic treatment using DOE & ANN methods
امین
احمدپور
دانشجو
author
علی
حقیقی اصل
دانشگاه سمنان
author
نرگس
فلاح
دانشگاه صنعتی امیرکبیر
author
text
article
2017
per
In this study, photocatalytic treatment was used to treat spent caustic wastewater of olefin petrochemical plants which is one of industrial wastewater with high total dissolved solids (TDS). For this purpose, by using the synthetic photocatalyst of ZNO and measuring the parameter of the chemical oxygen demand (COD), this parameter decrease percentage in the Photocatalyst process has been evaluated by means of Box-Behnken (BBD) design of experiment (DOE) and the artificial neural network (ANN) in a double-cylindrical-shell photo-reactor. According to the implemented calculations, it can be resulted that the artificial neural network is more suitable method than the experimental design in modeling and forecasting the amount of COD removal. Modeling of this research showed that increasing the concentration of photocatalyst in a state of neutral pH, lead to enhance the COD removal till the optimal amount of 1.8 g/L without restrictions and 2 g/L with restrictions in the rate of 79% and 68%, respectively.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
33
45
https://jsse.uk.ac.ir/article_1637_78409a24ccf8533cada70e3d5f7792c7.pdf
dx.doi.org/10.22103/jsse.2017.1637
Subsequent Extraction of Organic Matter from Peat Swamp Soil by Organic Solvents
میلاد
کردی
دانشگاه صنعتی امیرکبیر
author
تیمور
اسلام کیش
دانشگاه صنعتی امیرکبیر
author
text
article
2017
per
Study of substances dissolved in various solvents and extraction organic material extracted from organic soils like peat and swamps is one of the most important discussions in the field of organic chemistry. In this article, the application of Subsequent Extraction Method to study of the extracted substances in the organic solvents and the interaction with organic solvents has been studied. To achieve this goal, firstly, soil samples which consist organic matter have been collected from a swamp in Golestan province and then 4 types of organic solvent, Diethyl Ether, Ethanol, Dioxane, and Hexane were chosen as a solvent and were used respectively. To investigate the changes of solvents and determining the functional groups, FTIR was used in each phase of extraction. Results showed some compounds like lignin, fats, waxes, lipids, carbohydrates, and phenols are present in all phases but compounds such as clay, aldehydes, esters, humic acids, proteins, polysaccharides, and cellulose are shown in particular phases.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
47
56
https://jsse.uk.ac.ir/article_1638_67de874b39b637062ac5c27c56afcf10.pdf
dx.doi.org/10.22103/jsse.2017.1638
Feasibility study of using agglomeration method in heap leaching stage of copper oxidized ore by polymeric binder
فرج الله
کیانی بروجنی
مدیرعامل شرکت کیان معدن پارس
author
محمد حسن
گلپایگانی
کارشناس ارشد فرآوری مواد معدنی در شرکت کیان معدن پارس- فارغ التحصیل کارشناسی ارشد فرآوری مواد معدنی از دانشگاه کاشان
author
معبود
عسگری مهرآبادی
دانشوی دکتری فرآوری مواد معدنی دانشگاه صنعتی شاهرود و مدیر فنی آزمایشگاه شرکت صنعتی و معدنی کیان معدن پارس
author
بهار
صلاحی
کارشناس ازشد فرآوری مواد معدنی در شکرت کیان معئن پارس
author
text
article
2017
per
he most important factor in reducing the permeability of heap leaching, is the presence of fine particles which result in impermeable zones and channel streaming in the heap due to their movements along with the leaching agent in the aggregation areas. That’s why in Chahmousa copper mine, ore with 0-2 mm dimensions and with the copper grade of 1.34 %, could be separated before heap loading. In this research, in order to use the 0-2 mm fraction, the agglomeration method using inorganic compounds (sodium silicate, calcium sulfate) and non-ionic polymer compounds and cationic and anionic, is applied. The strength of bonding among particles is measured using soak test with fine migration parameter. Showing the least fine migration of 3.89%, based on the results, the most powerful bonding ties are agglomerates produced using non-ionic compounds. The reason for this increase in strength using non-ionic compounds is hydrogen bonding forces in which they are more effective aside with Van der Waals forces.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
57
67
https://jsse.uk.ac.ir/article_1641_fcea90bb5bb5f87bf117b535c0c9e090.pdf
dx.doi.org/10.22103/jsse.2017.1641
Comparison of chemical, morphological and adsorptive properties of physically-activated carbons produced from walnut shell and peach core
احسان
صالحی
عضو هیئت علمی
author
سلمان
احمدی پویا
التحصیل کارشناسی مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه اراک، اراک، ایران.
author
مجید
زارع زاده
عضو هیئت علمی/دانشگاه اراک
author
text
article
2017
per
Agricultural wastes are appropriate precursors for producing activated carbon due to their accessibility and affordability. Therefore, walnut hard shell and peach hard core were selected to produce activated carbon via physical activation method. Methyene blue was used to study the batch equilibrium adsorption. The equilibrium data was fitted to four isotherm models including Langmuir, Freundlich, Temkin and Dubinin-Radushkevich. Adsorption capacity of the walnut shell-based activated carbon was around 16 mg/g lower than that of the peach hard core. In addition, SEM and image processing technique were applied to compare the morphology of the two adsorbents. Results indicated that the peach core activated carbon has higher disordered structure, more homogeneous pore size distribution, higher pore density and better mechanical hardness reflecting superiority of this activated carbon for adsorption.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
69
79
https://jsse.uk.ac.ir/article_1642_a6ebea990ea0e51bf8916c438f9fdfac.pdf
dx.doi.org/10.22103/jsse.2017.1642
Mathematical modeling of carbon dioxide separation from gaseous mixture N2/CO2 using polypropylene hollow membrane contactor in the presence of aqueous amines
محمد رضا
طلاقت
عضو هیات علمی- بخش مهندسی شیمی دانشگاه صنعتی شیراز
author
امحد رضا
بهمنی
در حال حاضر سرباز وظیفه است
author
text
article
2017
per
In this paper, the mathematical modeling of carbon dioxide removal from the gas mixture of N2/CO2 in a polypropylene hollow fiber membrane contactor in the presence of amines is studied. Modeling was performed in both axial and radial directions under the fully-wet condition for countercurrent gas-liquid flow arrangement. To evaluate the model, the results of this model with experimental data and results of COMSOL software were compared. The results showed that, the CO2 removal efficiency increased with the increase of the liquid flow rate, number of fibers, membrane length,porosity-to-tortuosity ratio and solvent concentration, but, decrease by increasing gas flow rate. The results show that percentage of CO2 removal by the polypropylene hollow fiber membrane is higher than the polyvnildeflouride and polytetrafluroethylene hollow fiber membranes in the presence of MEA. Finally, the results showed that by increasing the wetting, the removal of gas is reduced.
Journal of Separation Science and Engineering
Shahid Bahonar University of Kerman
Iranian Association of Chemical Engineering
2008-3963
9
v.
1
no.
2017
81
97
https://jsse.uk.ac.ir/article_1644_ada020f3728fa77c099aed8f70f1bd25.pdf
dx.doi.org/10.22103/jsse.2017.1644