Tashkent Chemical Technological Institute

Tashkent, Uzbekistan

Tashkent Chemical Technological Institute

Tashkent, Uzbekistan
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Babakhanova Z.,Tashkent Chemical Technological Institute | Aripova M.,Tashkent Chemical Technological Institute | Khodjaev N.,Research Institute of Mineral Resources | Khamidov R.,Research Institute of Mineral Resources
Chemistry and Chemical Technology | Year: 2016

Exploration studies in Uzbekistan revealed one graphite deposit (Taskazgan) and about 25 sites with varying perspective degree. In order to obtain the graphite for refractory industry uses insufficiently known Rupat, Zauchak and Zahchahona sites were studied. According to the research, Zahchahona site can be classified as a medium-sized field; the refined graphite content in the ore deposit is 3 to 15 %, which meets the requirements of the industry for this type of raw material. Graphite was refined by flotation and leaching process, brought to grade of 75 % carbon. © 2016. Chemistry & Chemical Technology. All rights reserved.

Norkobilov A.,University of Cantabria | Norkobilov A.,Tashkent Chemical Technological Institute | Gorri D.,University of Cantabria | Ortiz I.,University of Cantabria
Chemical Engineering and Processing: Process Intensification | Year: 2017

Ethyl tert-butyl ether (ETBE) is widely used as an oxygenate additive to gasoline; however, a drawback in the conventional ETBE manufacture is the energy intensive product recovery process, making ETBE expensive. The purification process of ETBE involves the separation of ETBE, mixed C4 hydrocarbons and unreacted ethanol. The unreacted ethanol forms azeotropic mixtures with ETBE that are difficult to separate by distillation. In this work, a comparative study between the conventional process to produce ETBE and two alternative intensified processes is presented by means of process simulation in Aspen Plus. One of the alternative methods for improving the separation and purification section of ETBE is the use of a hybrid distillation-pervaporation process with alcohol-selective membranes, which allows to reach the target ETBE purity (95.2. wt%) with a lower energy consumption and at the same time the permeate stream, with a high ethanol content, is recycled back to the reaction section. Alternatively, the production of ETBE by means of reactive distillation is analyzed for the same basis of calculation. The results show that the reactive distillation allows a significant increase in the conversion of the reactants, but in contrast the energy consumption is higher than in the other processes evaluated. © 2017 Elsevier B.V.

Aksenov A.A.,Far Eastern Federal University | Mansurov Yu.N.,Far Eastern Federal University | Ivanov D.O.,National University of Science and Technology "MISIS" | Kadyrova D.S.,Tashkent Chemical Technological Institute
Tsvetnye Metally | Year: 2017

Nowadays, metals and alloys remain the main constructional materials for economy industries. Considering the consumption volume, aluminum, its alloys and wastes (the details which effective life is over) take the second place after steel. It is easy to explain looking at large natural reserves of raw materials for aluminum production in crust, and valuable complex of mechanical, physical and chemical, technological properties of aluminumbased alloys. Developers impose the requirements for decrease in the weight of designs, equipment and machines: that's why, in the last decade foamformed metal materials (so-called foamed metals) were developed. Aluminum alloys, owing to their properties' uniqueness, have also drawn attention of materials scientists as the raw materials for foam aluminum production. There were developed the technologies allowing to use the foam aluminum as the insulating elements for machine and facility strengthening. Foam aluminum developers set a purpose of its production from the alloys with increased durability. At the same time, some works were carried out to use the scrap and wastes of aluminum alloys for production a foam aluminum, and almost no works were carried out for development of technologies in production of art porcelain elements and metal art. Aluminum alloys have typical metal gloss, which makes them interesting for art objects making. In connection with this, it is urgent to develop a method of obtaining a foam aluminum for art materials science, development and production of art objects making technology. This article shows the results of investigations for obtaining a foam aluminum from scrap and waste of aluminum alloys. The optimal modes of obtaining a foam aluminum are developed for production of art objects for the market in the Far East. This work was carried out in the creative collaboration of teams of the Far Eastern Federal University, National University of Science and Technology MISiS and Tashkent Chemical-Technological University within the international projects TEMPUS-MMATENG and TEMPUS-NETCENG.

Juraev A.B.,Tashkent Chemical technological Institute | Alimukhamedov M.G.,Tashkent Chemical technological Institute | Magrupov F.A.,Tashkent Chemical technological Institute | Adilov R.I.,Tashkent Chemical technological Institute | Nizamov T.A.,Tashkent Chemical technological Institute
KGK Kautschuk Gummi Kunststoffe | Year: 2017

In the paper the influence of alcoholysis conditions of secondary polyethylene terephthalate on the structure and properties of hydroxyl-containing polyetherpolyols is exposed. The modified unsaturated polyester resin from alcoholysis products of SPET has been produced. Technological properties of the synthesised unsaturated polyethers have been investigated. The developed modified resin meets to technological norms of an import unsaturated polyether for the manufacture of polymer-composite pipes.

Kadirova Z.C.,Academy of Sciences of Uzbekistan | Kadirova Z.C.,Tokyo Institute of Technology | Hojamberdiev M.,Tokyo Institute of Technology | Katsumata K.-I.,Tokyo Institute of Technology | And 5 more authors.
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2014

The spherical granular activated carbon-carbon composites (GAC-Fe) with different iron oxide contents (Fe mass% = 0.6-10) were prepared by a pore volume impregnation method. The X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2-adsorption results confirm the presence of amorphous iron oxide, pyrolytic carbon, and graphitized globular carbon nanoparticles covered with amorphous carbon in the CAG-Fe. The rate of photodegradation of methylene blue (MB) in aqueous solution under UV light in the presence of oxalic acid correlates with porosity of the prepared materials. The total MB removal includes the combination of adsorption and photodegradation without the addition of H2O2. The results of total organic carbon (TOC) analysis reveal that the decolorization of MB in aqueous solution containing oxalic acid corresponds to the decomposition of organic compounds to CO 2 and H2O. © 2014 Copyright Taylor & Francis Group, LLC.

Jin J.,Jiangnan University | Sheraliev G.,Jiangnan University | Sheraliev G.,Tashkent Chemical Technological Institute | Xie D.,Jiangnan University | And 3 more authors.
JAOCS, Journal of the American Oil Chemists' Society | Year: 2016

The current concern for health has raised the importance of natural micronutrients in edible oils and fats. Different from common micronutrients, e.g., tocopherols, tocotrienols, stigmasterol and sitosterol, new and emerging specialty micronutrients, such as plastochromanol-8, resveratrol, phenylpropanoid amides of 5-hydroxytryptamine, lanosterol, ergosterol and cyclolinopeptides, are becoming increasingly popular among health-conscious people. The first three are phenolic compounds, the forth and fifth sterols, and sixth a peptide. These micronutrients are usually present in certain oils or oilseed-related byproducts, including rapeseed, peanut, flaxseed, tea seed, and camellia oils, and safflower seed cakes, all of which are the highly valuable products of the lipid industry in China nowadays. The first object of this review is to discuss the characteristics of the micronutrients, mainly including their varieties, structures, and sources. Second, the antioxidant activities and indicative functions for oil quality were also analyzed in detail. Third, refining techniques, breeding programs and extraction methods are suggested. Suitable modification treatments of certain micronutrients are also advocated to make them easy to incorporate in other foods. © 2015 AOCS.

Fiocco L.,University of Padua | Babakhanova Z.,Tashkent Chemical Technological Institute | Bernardo E.,University of Padua
Ceramics International | Year: 2016

Rare-earth (RE) doped glass-ceramics represent very interesting luminescent materials. The thermal annealing of the glass precursor causes the controlled precipitation of several crystalline phases, in which RE may be variously distributed, also with different oxidation states, e.g. Eu2+ and Eu3+. The present investigation demonstrates the feasibility of preparation of RE-doped alumino-boro-silicate glass-ceramics by direct firing in air (at 1000-1200 °C) of a preceramic polymer, filled with nano- and micro-sized particles, as an alternative to glass melting and annealing. In particular BaCO3 or SrCO3 micro-particles, mixed with nano-sized γ-Al2O3, were found to react with amorphous silica, available from the oxidative decomposition of a commercial silicone, yielding a strontium or a barium alumino-silicate phase. Boric acid micro-particles contributed both to the development of a liquid phase upon firing (promoting ionic interdiffusion) and to the formation of a La-borate phase, by interaction with La2O3 micro-particles. The blue and red luminescence of the obtained glass-ceramics is attributed to the incorporation of Eu2+ and Eu3+ ions, from nano-sized Eu2O3 filler, in alumino-silicate and borate phases, respectively. © 2016 Elsevier Ltd and Techna Group S.r.l.

Babakhanova Z.,Tashkent Chemical Technological Institute | Aripova M.,Tashkent Chemical Technological Institute | Bernardo E.,University of Milan
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2016

Luminescent materials, activated by europium ions, with the composition SrAl2Si2O8/LaBO3 were synthesized using organosilicon compounds (methyl polysiloxane MK). The luminescence properties in red and blue LED range are characteristic of materials synthesized at 1100°C. In addition, strong luminescence is characteristic of trivalent europium ions (peaks at 591, 616, and 655 nm) in the red region of the spectrum and weak luminescence in the blue region of bivalent europium ions (peak at 405 nm). The possibility of incorporating two types of europium cations (Eu2+ and Eu3+) into the structure of synthesized polycrystalline materials makes it possible to regulate their spectral properties as a function of the conditions of synthesis. © 2016 Springer Science+Business Media New York

Adinaev K.A.,Tashkent Chemical Technological Institute | Ismatov A.A.,Tashkent Chemical Technological Institute
Russian Journal of Applied Chemistry | Year: 2010

The information on obtaining colored transparent glasses of lead silicate composition is given in the article. Cr2O3, Mn 2O3, Fe2O3, Ni2O 3, Y2O3, Ce2O3, Nd 2O3, and Er2O3 are used as colorants. Structural features of obtained glasses are investigated by methods of infrared spectroscopy and electron microscopy. © 2010 Pleiades Publishing, Ltd.

Alimzhanova Zh.I.,Tashkent Chemical Technological Institute | Kadyrova D.S.,Tashkent Chemical Technological Institute | Yusupova M.N.,Tashkent Chemical Technological Institute
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2014

Green, blue and turquoise ceramic pigments have been obtained by means of heterovalent substitution of atoms based on calcium aluminosilicate (anorthite) with calcium and silicon ions replaced by transition elements and aluminum using quartz sand from the Navoinskoe deposit, Samarkand chalk and alumina-containing wastes from the Shurtanskii Gas-Chemical Complex. The physical-chemical properties of the pigments were studied. The new ceramic pigment compositions were used to produce a commercial test lot of decorative majolica. © 2014 Springer Science+Business Media New York.

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