Kocaeli University | Chemical Engineering

Any impurities above a certain concentration in water are harmful to the living spaces of living things. Therefore, the removal of pollutants in the water is very important in terms of maintaining the lives of living things. Nickel has an... more

Hydrogen is considered as the cleanest fuel of the future due to its environmental friendliness. Since each of the hydrogen production methods is not always green, there has been a need to redesign processes to minimize waste, increase... more

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- by Meltem YILDIZ
- •
- Green Synthesis

deactivation conditions of a co-precipitated 36 wt% Co/Al2O3 catalyst in CO hydrogenation were investigated. Environmental-SEM-EDX and temperature-programmed reduction (TPR) studies were performed on used catalysts to investigate the... more

Biodiesel, monoalkyl esters of fatty acids derived from vegetable oils or animal fats, is known as a clean and renewable fuel. Biodiesel is usually produced by the transesterification of vegetable oils or animal fats with methanol or... more

Biodiesel produced by the transesterification of vegetable oils is a promising alternative fuel to diesel because of limited fossil fuel resources and environmental concerns. The use of heterogeneous catalysts greatly simplifies the... more

As the renewable energy technologies are making progress every day, hydrogen energy technologies are taking huge part of this development. Nowadays, there are several industries using hydrogen. Also, the increase at biodiesel production... more

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- by Meltem YILDIZ
- •
- 2
  Catalysis, Hydrogen Production

It was investigated the lactic acid production by glycerol oxidation using % 1 Au/ bentonite catalysts in alkaline medium. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath over a... more

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- by Meltem YILDIZ
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- 2
  Chemistry, Catalysis

The development of specific "green" solvents with unique combination of properties and associated techniques for target applications, capable of minimizing the environmental impact from their use in chemical production or by developing... more

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- by Meltem YILDIZ
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- 3
  Materials Science, Renewable Energy, Ionic Liquid

The direct combination of hydrogen and oxygen to form hydrogen peroxide in liquid media with prepared catalysts was carried out in a slurry reactor at atmospheric pressure and room temperature. An O2/H2 ratio of 2:1 with a 50 mL/min flow... more

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- by Meltem YILDIZ
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- 3
  Chemistry, Inorganic Chemistry, Catalysis

Sulfonated polyether-etherketone (SPEEK) has a potential for proton exchange fuel cell applications. However, its conductivity and thermohydrolytic stability should be improved. In this study the proton conductivity was improved by... more

Bir ağacın gövdesinin dallarına oranla daha fazla gelişmesi nasıl ki toprağı olumsuz yönde etkileyecekse asimetrik gelişmemiz de doğayı bugünkü vahim durumuna getirmiştir.

ÖZ Bu çalışmada, kağıt endüstrisi atıksularının NFgevşek/NFsıkı membran filtrasyonu ile sürekli işletimi sonucu oluşan konsantre akımın, hibrit İleri Oksidasyon (Fenton ve foto-Fenton)/batık UF prosesleri ile arıtılarak minimizasyonu... more

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- by Elif Durna
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- 2
  Membrane Science, Membrane Separation Technology

Öz Abstract Bu çalışmada, kağıt atıksuları için literatürde etkinliği bilinen basınç sürücülü sistemlerin kesikli şartlarda işletimleri, NFgevşek/NFsıkı membran sistem kombinasyonu kullanılarak yerine getirilmiştir. Kesikli... more

Öz Abstract Bu çalışmada, kağıt atıksuları için literatürde etkinliği bilinen basınç sürücülü sistemlerin kesikli şartlarda işletimleri, NFgevşek/NFsıkı membran sistem kombinasyonu kullanılarak yerine getirilmiştir. Kesikli NFgevşek/NFsıkı deneyleri sırasıyla 12 ve 20 barda klasik membran filtrasyon yöntemiyle 300 rpm'lik karıştırma hızında, pH 10'da ve 25 °C sıcaklıkta uygulanmıştır. Kesikli işletim şartlarında kullanılacak en uygun membran türlerinin tespiti NFgevşek için NP010, NFG, MPF36 ve CK3001 ve NFsıkı için NP030, NF270, DS-5DK, ESNA olmak üzere toplamda 8 farklı membran kullanılarak, organik madde giderimi ve süzüntü akı değerleri üzerinden belirlenmiştir. NFgevşek membranlarda 4.12 L/m 2 sa'lik süzüntü akısında, %61.0 TOK ve %76.9 KOİ giderimi ile MPF36 membran en iyi NFgevşek membran olarak belirlenmiştir. Sürekli işletimle MPF36 ile elde edilen süzüntü suyu daha sonra NFsıkı membranlardan geçirilmiştir. Tüm NFsıkı membranlarda, genel olarak iyi seviyelerde organik madde giderim etkinliği elde edilmiş olmakla birlikte 10.05 L/m 2 sa süzüntü akısında, %93.9 TOK ve %94.2 KOİ oranlarında organik madde giderimi sağlanarak en iyi çıkış suyu kalitesi eldesi bakımından ESNA uygun membran olarak seçilmiştir. Bu noktadan hareketle, kâğıt atıksularının etkinliği bilinen basınç sürücülü NFgevşek/NFsıkı bütünleşik membran sistemiyle kısa süreli işletimlerinde, 7.35 pH ve 144 S/cm iletkenlik değerlerinde 13 mg/L TOK ve 28 mg/L KOİ konsantrasyonlarında iyi kalitede arıtılmış çıkış suyunun elde edilebildiği, ayrıca hedeflenen çıkış suyu açısından, iyi kalitede yeniden kullanım suyu üretilebildiği görülmüştür. In this study operating pressure driven systems which is known their efficiency in literature, for paper and pulp industry wastewaters in batch conditions were executed by using NFloose/NFtight membrane combination. The batch NFloose/NFtight experiments were respectively applied at 12 and 20 bars by conventional membrane filtration process, at a stirring rate of 300 cycle/min, at pH 10 and at a temperature of 25 °C. Determination of most suitable membrane at batch operating conditions were made by using 8 different membranes (for NFloose NP010, NFG, MPF36 and CK3001 and for NFtight NP030, NF270, DS-5DK, ESNA) through organic matter removal and filtrate flux values. In NFloose membranes at a filtrate flux of 4.12 L/m 2 h removal of 61.0% TOC and 76.9% COD and MPF36 membrane was determined to be best NFloose membrane. The filtrate water obtained by MPF36 were later passed through NFtight membranes. In all NFtight membranes generally the organic matter removal efficiency was good and ESNA was selected to be the best membrane in terms of effluent quality by obtaining organic matter removal at rates of 93.9% TOC and 94.2% COD with 10.05 L/m 2 h filtrate flux. From this point of view, in short term operation of paper wastewaters by pressure driven NFloose/NFtight integrated membrane system, it was seen that good quality of outlet water with 7.15 pH and a conductivity coefficient of 144 µS/cm and at 13 mg/L TOC and 28 mg/L COD concentrations could be obtained also that good quality of reuse water could be produced in terms of aimed effluent water.

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- by Elif Durna and +1
  coskun aydiner
- •
- 2
  Membrane Science, Membrane Filtration

The surfeit of crude glycerol as by product from biodiesel industry triggered alternative routes to valorise glycerol to value added fuels such as syngas, mixture of hydrogen and carbon monoxide. Dry reforming of glycerol uses carbon... more

The surfeit of crude glycerol as by product from biodiesel industry triggered alternative routes to valorise glycerol to value added fuels such as syngas, mixture of hydrogen and carbon monoxide. Dry reforming of glycerol uses carbon dioxide (CO2) as reactant to produce syngas. The process of glycerol dry reforming has been simulated and the effect of thermodynamic properties on yield, selectivity and conversion were studied and optimized with the aid of ASPEN PLUS V8.8 in this paper. The process of simulating glycerol dry reforming was carried out using RGIBBS and RPLUG reactor types. The sensitivity analysis and the optimization of the process were accomplished using the sensitivity and optimization sections of the model analysis tools of the ASPEN PLUS. Furthermore, sensitivity analysis was carried out to observe the effect of several parameters. The kinetic data for glycerol dry reforming and water gas shift reactions were obtained from literature. The kinetic based simulation was performed using ASPEN PLUS RPLUG model blocks with rearranged Power law and Langmuir-Hinshelwood-Hougen –Watson (LHHW). The result obtained revealed that the simulation with RGIBBS and RPLUG gave different values of components. Furthermore, it was revealed from sensitivity analysis of the process that optimization was necessary to obtain the operating variable that would involved in the process. Optimization was able to give a satisfactory value of conversion of glycerol, carbon dioxide for reforming and carbon monoxide and water for water gas shift reaction. However, much has been reported about thermodynamic analysis of steam reforming of glycerol, little is known about thermodynamic analysis of glycerol dry reforming. In this regard, in the current work, with Aspen plus simulator glycerol dry reforming thermodynamic analysis is carried out. The effect of process such as: temperature, pressure, length of the reactor, catalyst particle density, and feed ratio to the reactor performance were investigated. Based on this the yield of syngas was 92% over the range of temperature 573 -1273K whereas, over the range of pressure 1-30 bar and feed ratio 1-5; the yield of syngas were 50% and 51.24% respectively

Key word: Sensitivity analysis, Aspen plus, Optimization, Syngas, Dry reforming

Exopolysaccharides (EPSs), which are secreted by microorganisms are natural, nontoxic, biocompatible and biodegradable polysaccharides. Chemical modifications of exopolysaccharides, such as phosphorylation, sulfation, oxidation,... more

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- by Ayça Akçay
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- 5
  Bioengineering, Chemical Engineering, Polymer Chemistry, Biotechnology

Chemical derivatives of levan from Halomonas smyrnensis AAD6 T with low, medium and high levels of sulfation were synthesized and characterized by FTIR and 2D-NMR. Sulfated levan samples were found to exhibit anticoagulation activity via... more

Zeolite beta Membrane electrode assembly (MEA) a b s t r a c t Sulfonated polyether-etherketone (SPEEK) has a potential for proton exchange fuel cell applications. However, its conductivity and thermohydrolytic stability should be improved.

Rhodobacter sphaeroides O.U. 001 is a purple non-sulfur bacterium which evolves hydrogen from the breakdown of organic acids under illumination and anaerobic conditions. In this study, the effect of light intensity, light wavelength and... more

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- by L. Turker and +1
  Basar Uyar
- •
- 5
  Engineering, Chemical Engineering, Hydrogen Production, Design of photobioreactors

Chemical Engineering

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