Kimya Mühendisliği

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The influence of lactic acid on the rate of absorption of premetallized dyes on untanned proteinic tissue
(Thesis (M.S.)- Robert College. Institute for Graduate Studies in Science and Engineering, 1964., 1964.) Fricke, Winfried S.; Noyan, Turgut.
Pozzolan of Çanakkale
(Thesis (M.S.)- Robert College. Institute for Graduate Studies in Science and Engineering, 1966., 1966.) Orhon, Gültekin.
Growth of protein-rich micro-organisms in petroleum
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Bilgin, Ömer.; Noyan, Turgut.
Beneficiation of the oolitic mineral of the Çamdağ iron deposits
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Dereboylu, Günseli.; Noyan, Turgut.
The use of perlite in the manufacture of oxychloride cement compositions
(Thesis (M.S.)- Robert College. Institute for Graduate Studies in Science and Engineering, 1967., 1967.) Natan, İsak.; Noyan, Turgut.
Activation of some Turkish clays to be used in bleaching of edible oils
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1968., 1968.) Taner, Meral.; Noyan, Turgut.
Production of citric acid from Turkish molasses by fermentation
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Mutluay, Işın.; Noyan, Turgut.
A study on the production of antimony trioxide from its ores by volatilization process and its properties
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Kohen, Marko.; Noyan, Turgut.
Protein by micro-organisms
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 199., 1969.) Özgen, Cenk.; Noyan, Turgut.
Isıl kararlılıklı polifenil kinoksalin'in termodinamik özelliklerinin gaz kromatografisinde incelenmesi
(Thesis (Assoc. Prof.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1977., 1977.) Dinçer, Salih.
Gibbs energies of adsorption (Gads) of an aromatic heterocyclic thermally stable polymer, polyphenyl quinoxaline (PQF), having a high glass transition temperature, have been obtained at l51.16°C, 176.35°C and 200.85°C with 38 solvents by gas-solid chromatography. Gads has been expressed at the three temperatures in terms of the polarizability and dipole moment of solvent and solvent-polymer specific interaction parameter. A solubility criterion for PQF has been stated in terms of solubility parameters of solvent and polymer, Flory-Huggins parameter and specific interaction parameter of polymer-solvent pair. A computer program has been developed to evaluate gas chromatographic data and to estimate pure solvent properties as second virial coefficient, critical temperature, pressure and volume, saturated vapor pressure, heat of vaporization, liquid molar volume and solubility parameter.
Sıvı akış profillerinin damlama yatak reaktörlerinin çalışmasına etkileri
(Thesis (Assoc. Prof.) - Boğaziçi Universitesi. Intıtute of Social Sciences, 1977., 1977.) Kandiyoti, Rıfat.
Katalitik hidrojen giderme reaksiyonlarının adsorplanma ve reaksiyon parametrelerinin gazkatı kromatografisi yöntemiyle incelenmesi
(Thesis (Assoc. Prof.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.) Önsan, Zeynep İlsen.
Çevre şartlarına bağlı olarak T90 değerinin değişimi
(Thesis (Assoc. Prof.) - Bogazici University. Institute of Sciences and Engineering, 1979., 1979.) Curi, Kriton, 1942-1996.
Organik sıvıların ısıl iletkenlik katsayılarının hesaplanması için yeni bir bağıntı
(Thesis (Assoc. Prof.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.) Arıkol, A. Mahir.
A study of penetration of oil into sorbents
(Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1982., 1982.) Orhan, Metin.; Dinçer, Salih.; Tekeli, Sahim.
This study was initiated to absorb petroleum spills in sea waters. For this purpose, polyurethane and polypropylene were used as sorbents, and SAE 20W-20 motor oil and SAE 90W gear oil were used as oils. To observe the penetration of oils into sorbents, four groups of experiments were carried out the horizontal penetration of oils into dry polyurethanes, the horizontal displacement of water from polyurethanes (pre-wetted with water) by oil, the vertical penetration of oils into drypolypropylenes, and the vertical retention of oils by polyurethanes (pre-wetted with oil). Sorbents are characterized by their porosities, thicknesses, and fiber diameters. Such properties of .the sorbents used were obtained from the literature. The important properties of an oil are the density, the viscosity and the surface tension coefficient. The values for the density and the viscosity of oils used were supplied by Mobil Oil Company in Istanbul. The surface tension coefficients of these oilS also were measured in Bogaziçi University Labs. The sorbent/oil contact angle, which is another important parameter, was taken as zero by assuming that the sorbents were completely wetted with oil. A linear model, developed in literature for the horizontal penetration of oils into sorbents, was used in this study, and the experimental results obtained in this study did not agree with this model. Here, the distance penetrated by oil into sorbents was observed to be directly proportional to the square root of time. In addition, the horizontal displacement of water from sorbents by oil was also studied here. The polyurethane samples (pre-wetted with water) did not absorb oil, that is, water prevented the penetration of oil into Sorbent. Therefore, the displacement of water from sorbents by oil could not be achieved. This indicates that the sorbents can absorb oil from the surface of sea waters, if they are prevented from being wetted. The verticalpenetratjon rate model, taken from the literature, is nonlinear. The vertical retention model, which was·developed in this study, is also nonlinear. The experimental and the theoretical results showed that both the vertical penetration rate and the vertical retention were nonlinear. In the vertical penetration rate experiments, the rate at which oil climbed up the soroont was measured. In the vertical retention experiments, the rate at which oil drained from the sorbent was measured. The evalua.tions were based on these measurements.
Phase transition in homogeneous flow of nematic fluids
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1983., 1983.) Bahar, İvet.; Erman, Burak.; Dinçer, Salih.
Possibility of fonnation of a highly concentrated anisotropic phase in a dilute soluticn of rodlike molecules is investigated. The free energy expression for quiescent solutions of rodlike particles, introduced by Flory, is extended to the case where the molecules are subject to homogeneous velocity field. An additional term accounting for the contribution of the flow field to phase transition is incorporated into the free energy expression. The contribution of stressinduced diffusion is considered too. It is concluded that there will be a highly concentrated liquid crystalline phase deposition on the stagnant regions of the conduit, provided that the solvent-solute interaction is sufficiently high. The application of the theory to the aggregation of cholesterol molecules, in blood vessels, is discussed.
Extraction of lignites from Çan, Soma and Tunçbilek with donor and non-donor solvents in soxhlet extractor and autoclave
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1983., 1983.) Bolat, Esen.; Dinçer, Salih.
Available energy analysis of a petroleum refinery
(Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1984., 1984.) Erkan, Deniz.; Dinçer, Salih.
The aim of this thesis is to examine the concept of available energy (availability) as applied to a petroleum refinery. For this purpose two different parts of the refinery were investigated. The first part, namely the plant 5 of İPRAŞ Refinery, deals mainly with separation and heat transfer processes. The second part, namely the Plant 6 of İPRAŞ Refinery, deals mainly with chemical reaction processes. The data needed in the calculation for Plant 5 were supplied by İPRAŞ. However, since Plant 6 involves chemical reactions and in chemically reacting systems standard chemical availabilities are needed and these standard chemical availabilities had to be simply estimated because of the uncertain structure of fractions. Therefore, the availability calculations carried out for Plant·6 are quite approximate and they are preliminary in nature. In addition, an availability analysis was made for each equipment of Plant 5 to investigate vlhere the availability losses occurred. The majority of process availability losses are in the furnaces, heat exchangers before desalters and in the air and water coolers. The availability loss of the overall process was also calculated for Plant 5 bv an overall balance. For·Plant 6, on the other hand, the availability calculations were made approximately only for the overall process .because of thelack of necessary data. In addition, an availability efficiency, which is also called Second Law efficiency in literature, was defined and it was reduced to suitable forms for different equipment.
pH and temperature dependence of the rate of dissolution of AgIO3
(Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1984., 1984.) Uyanık, Ömer Lütfi.; Enüstün, Vedat.
In this thesis a theory based ona dissolution model was checked experimentally. The theory which is developed by B.V. Enüstün expresses the initial rate of dissolution for a 1:1 type ionic solid in terms of the model parameters by considering the electrochemical properties of the crystal/ solution interfate. The theory has been verified previously on the basis of some experimental work by observing the . dependence of the initial dissolution rate of AgI03 on ionic strength in various media at 25 °C. In this work, the dissolution kinetics of AgI03 was investigated as a function of pH at 25 °C, and temperature using a concentration cell with silver electrodes. It was observed that in acidic media, initial dissplution rate of AgI03 drops to an asymptotic value at high and medium pH's showing a Gouy type electrical double layer behavior due to the proton nature of H+ ions. The temperature dependence of the initial dissolution rate of AgI03 in distilled water follows an Arrhenius type relation with a reasonable value of activation enthalpy for dissolution. The dependence of initial dissolution rate of AgI03 on ionic strength in various media at 25 °C was also followed and the results previously obtained hav.e been reproduced. Two important conclusions reached at the end of the work-were that in the presence of small hydrated cations in the dissolution medium the electrical double layer behaves as a Gouy layer and in the presence of large hydrated cations it behaves as a Stern layer.
A process variable study of apple pectin extraction
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1985., 1985.) Dereboylu, E. Ayça.; Hortaçsu, Öner.; Arıcan, Haluk.
Dried Amasya apple pomace was used for extraction of apple pectin in this process variable study. Process variables of the extraction process were chosen as extraction temperature, duration of the extraction and acidity of the extraction medium. The effect of these variables on the yield and quality of pectin obtained were studied. To determine the quality of pectins their equivalent weights and methylester contents were measured. by titrating 0.5 per cent water solutions of pectins obtained with dilute alkali. Using the titration results total anhydrouronic acid contents of pectins were calculated. Absolute viscosities of one per cent water solutions of pectins obtained were measured. The results showed that pectin yield increased with time and temperature. It was seen that yield increase was directly related to the extraction time and the temperature effect was similar in all levels studied. The anhydrouronic acid content·of pectins increased with temperature. The methylester content of pectins- showed similar behaviour. as anhydrouronic acid content. The constant temperature lines crossed each other near 750 °C - 45 min point. At lower temperatures pectins with higher degree of esterification were obtained. The results showed also that pectin yield increased with increasing acidity. Anhydrouronic acid content was highest acidity and pectin with lower methylester content was obtained. Degree of esterification of pectins extracted increased with decreasing acidity of extraction medium. Experimehtal runs showed deviations from the literature as a result of the clqrification problem.

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