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- Halogen- and nitrobenzoylisothiocyanates (2)
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- Petal (2)
Articles 1 - 30 of 87
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Gradient Precipitation Of Recombinant Proteins Contained In Silkworm Larvae (Bombyx Mori) With Ammonium Sulphate, Abdurhakhmanov Jaloliddin, Sasmakov Sobirdjan, Khasanov Shuhrat, Ashirov Оybek
Gradient Precipitation Of Recombinant Proteins Contained In Silkworm Larvae (Bombyx Mori) With Ammonium Sulphate, Abdurhakhmanov Jaloliddin, Sasmakov Sobirdjan, Khasanov Shuhrat, Ashirov Оybek
CHEMISTRY AND CHEMICAL ENGINEERING
We investigated the protein extract of silkworm larvae. For the first time, an extract containing proteins from silkworm larvae, obtained by fractional precipitation using ammonium sulfate, was studied. As a result of experiment is established, that solutions of ammonium sulfate with a concentration from 20% to 65% are optimal for the sedimentation of protein molecules with a mass in the range of 25 and 45 kDa. Optimal results of the study proposed to use in the process of purification of recombinant proteins.
Extraction-Photometric Determination Of Bismuth (Iii) With 1-(2-Pyridylaze)-2-Naphthol, Turabdjanov Sadritdin, Otakuzieva Vazira, Giyasov Anvar, Rakhmatullaeva Nargiza
Extraction-Photometric Determination Of Bismuth (Iii) With 1-(2-Pyridylaze)-2-Naphthol, Turabdjanov Sadritdin, Otakuzieva Vazira, Giyasov Anvar, Rakhmatullaeva Nargiza
CHEMISTRY AND CHEMICAL ENGINEERING
The conditions of selective extraction of the bismuth (III) by inert organic solvents in the presence of DMFA are established. The conditions for complex formation of the bismuth (III) with the PAN directly in the organic phase are found. It is possible to increase the sensitivity of the methodology using more sensitive azoreagents that have not found the application in practice due to their low selectivity. The effect of extraneous ions on the results of the definition of the bismuth (III) with the PAN azoreagent is investigated. In the presence of large amounts of extraneous ions the determination of bismuth …
Analysis Of Experimental Research In Determining Bubbling Extractor Mixing Zones’ Sizes, Karimov Ikromali
Analysis Of Experimental Research In Determining Bubbling Extractor Mixing Zones’ Sizes, Karimov Ikromali
CHEMISTRY AND CHEMICAL ENGINEERING
In the inner mixing zone of the tested suspended extractor, the fluid and gas flows in the stream and the external mixing zone moves in a contradictory flow. In order for these mixing zones to operate equally in hydrodynamic mode, their gas values should be equal. This is achieved by the correct selection of the dimensions of the mixing zones of the liquid and gas. The article summarizes the results of the study of the measurement of the mixing zones of the apparatus.
Sorbents For Cleaning Of Vegetable Oils, Ikromov Oybek, Suvanova Fayoza, Farmonov Jasur
Sorbents For Cleaning Of Vegetable Oils, Ikromov Oybek, Suvanova Fayoza, Farmonov Jasur
CHEMISTRY AND CHEMICAL ENGINEERING
The article presents the results of the study of adsorbents obtained from rice husk. To increase the sorption capacity of the raw material is treated with hydrogen peroxide for 30 minutes and subjected to roasting. Before thermal activation, the resulting mass was treated with a 30% alumium calcium alum solution. Reagent consumption is 20% of the mass of the adsorbent. The alum-enriched adsorbent is thermally activated at a temperature of 300-800 °C without oxygen access for two hours. According to the results of laboratory tests, the adsorbents that have undergone thermal activation at a temperature of 500-800 °C have the …
Development Of Environmentally Friendly Drilling Fluids In Order To Reduce The Anthropogenic Impact On The Environment, Arslanova Nodirakhon, Arslanov Sharafutdin, Zavorotnyy Vitaliy Leonidovich
Development Of Environmentally Friendly Drilling Fluids In Order To Reduce The Anthropogenic Impact On The Environment, Arslanova Nodirakhon, Arslanov Sharafutdin, Zavorotnyy Vitaliy Leonidovich
CHEMISTRY AND CHEMICAL ENGINEERING
The article discusses natural clay as a raw material for drilling fluids of the oil and gas industry of the Republic of Uzbekistan. Studied compositions of clays from the Akoy and Navbakhor area (the Republic of Uzbekistan) and Tagansky area (Republic of Kazakhstan) were. Evaluated technological parameters of clay powders based on the original and modified explored clays. Were determined modifying additives (2.0% Na2CO3 and PAA 0.25%) to obtain low-toxic clay powders that do not have a technogenic impact on the environment during the drilling process. Calculations are confirmed by the results of bio-testing using standard methods based on the …
Physico-Chemical Properties Of Hydrogel Based On 1-Chloro-3-Piperidino-2-Propylacrylate, Pulatova Nilufar, Maksumova Oytura
Physico-Chemical Properties Of Hydrogel Based On 1-Chloro-3-Piperidino-2-Propylacrylate, Pulatova Nilufar, Maksumova Oytura
CHEMISTRY AND CHEMICAL ENGINEERING
In the article the results of synthesis of the reticulated high molecular connection are rotined on the basis of 1-khlor-3-piperidin-2-propilakrilata, his structure and properties. Influence of different factors is studied on the process of receipt of hydrogel. Physical and chemical properties of polymer are studied on the basis of 1-khlor-3-piperidin-2-propilakrilata, swelling speed in water and different environments. A change speed of swelling of hydrogel is rotined from acid and alkaline terms, that them it is possible to vary. A change swelling speed depending on a temperature was studied at different temperatures and it is rotined that with the increase of …
Benzamide Coordination Compounds Of Magnesium Nicotinate, Ibragimova Мavluda, Ibadullayeva Тursunoy
Benzamide Coordination Compounds Of Magnesium Nicotinate, Ibragimova Мavluda, Ibadullayeva Тursunoy
CHEMISTRY AND CHEMICAL ENGINEERING
The synthesis of benzamide coordination compounds of magnesium nicotinate by a mechanochemical method was carried out. The optimal component ratios and the time of the reactions were established. The composition of the synthesized compounds is established by the method of elemental analysis. A comparison of the interplanar distances and the relative intensities of magnesium nicotinate, formamide molecules, acetamide, benzamide, and the synthesized complexes shows that the new coordination compounds differ from each other, as well as from the initial components. Therefore, the compounds have an individual crystal lattice. The method of coordination of amide molecules, the environment of the central …
Enantioselective Alkynylation Of Some Cyclical Ketones By 3,3′-Diphenylbinaphtol Dilithium, Otamuxamedova Guzal, Ziyadullayev Odiljon, Shmid Elena, Maniecki Tomash
Enantioselective Alkynylation Of Some Cyclical Ketones By 3,3′-Diphenylbinaphtol Dilithium, Otamuxamedova Guzal, Ziyadullayev Odiljon, Shmid Elena, Maniecki Tomash
CHEMISTRY AND CHEMICAL ENGINEERING
Synthesis of new biologically-active acetylene alcohols containing in composition of their molecules aromatical, cyclical and hydroxyl-groups and also triple bond by reaction of enantioselective alkylation of some cyclic ketones such as cyclohexanon, 2-methylcyclohexanon, menton and camphora with phenylacetylene in the presence of 3,3′-diphenylbinaphtol has been investigated. New methods of synthesis of acetylene alcohols and mechanisms of corresponding reactions were preposed. Influence of nature of initial compounds, catalysts and solvents on carring out of reaction and yields of products has been determined. On the base experimental results optimal condition of carring out of reactions have been also determined. It was shown …
Influence Of The Structure Of Aldehydes On The Directions Of Their Reactions With Monoethanolamine, Khudoyberdidiev Akhmadali, Khodjayorova Guzal, Adilov Ravshan, Alimukhamedov Muzaffar
Influence Of The Structure Of Aldehydes On The Directions Of Their Reactions With Monoethanolamine, Khudoyberdidiev Akhmadali, Khodjayorova Guzal, Adilov Ravshan, Alimukhamedov Muzaffar
CHEMISTRY AND CHEMICAL ENGINEERING
The article presents the results of studies to identify the nature of aldehydes on the direction of their reaction with monoethanolamine. IR, PMR and NMR13C spectral analyzes have shown that a heterocyclic compound consisting of methylene groups and tertiary nitrogen is formed as a result of the reaction of equimolar amounts of MEA and PD. In addition, each tertiary nitrogen atom contains a side pendant - hydroxyethyl groups. The presence of hydroxyl groups allows this compound to be attributed to symmetrical hexahydrotriazine containing three OH groups. The formation of symmetric hexahydrotriazine is due to the trimerization of methylideneaminoethanol, which in …
Development Of Technology For Obtaining Liquid Synthetic Washing Means On The Basis Of Local Raw Material Resources, Erkayeva Nazokat, Sharipova Khabiba, Erkayev Aktam, Kucharov Bakhrom
Development Of Technology For Obtaining Liquid Synthetic Washing Means On The Basis Of Local Raw Material Resources, Erkayeva Nazokat, Sharipova Khabiba, Erkayev Aktam, Kucharov Bakhrom
CHEMISTRY AND CHEMICAL ENGINEERING
The aim of the study is to determine the optimal composition of the composition of synthetic detergents having a high functional property from local raw materials. For the preparation of synthetic detergents as a source of raw materials were used: sodium laureth sulfate, linear alkyl benzene sulfonic acid, urea, sodium chloride, sodium carboxyl methylcellulose, various types of starches, gelatin and potassium carbonate. The paper studies the effect of the compositions of the composition of synthetic detergents on their functional performance and foaming and detergency capacity, depending on the mass ratio of the initial reagents and the amount of added potassium …
Monocalcium Phosphate From Central Cyzylkum Phosphorites, Shaymardanova Mohichehra, Usmanov Ilkham, Melikulova Gavkhar, Mirzakulov Kholtura
Monocalcium Phosphate From Central Cyzylkum Phosphorites, Shaymardanova Mohichehra, Usmanov Ilkham, Melikulova Gavkhar, Mirzakulov Kholtura
CHEMISTRY AND CHEMICAL ENGINEERING
The results of researchers on the obtaining of defluoride monocalsiumphosphate using defluorinated and desulphated extraction phosphoric acid obtained from washed fured phosconcentrate and limestone are presented. The data are presented on the effect of partially defluorinated and desulphated extraction phosphoric acid on the chemical composition of the resulting pulp of monocalciumphosphate at a rate of 40-45% for P2O5 acid 95, 100, 105 and 110% of stoichiometry on the formation of monocalciumphosphate. With an increase in the concentration acid, the content of P2O5 increases, depending on the quadbit ox acid, and contein of fluorine does not exceed 0.27%.
Photocatalytic Properties Of Almalyk Mining Company Zns Concentrate, Kadirova Zukhra, Strijevskaya Anna, Hojamberdiev Mirabbos, Daminova Shahlo
Photocatalytic Properties Of Almalyk Mining Company Zns Concentrate, Kadirova Zukhra, Strijevskaya Anna, Hojamberdiev Mirabbos, Daminova Shahlo
CHEMISTRY AND CHEMICAL ENGINEERING
Mineralogical and chemical compositions of the Almalyk Mining zinc concentrate were studied. Experimental results indicated that sphalerite zinc concentrate can be used as a photocatalyst for decomposition of different reactive textile dyes in water treatment. The photodegradation rate constant increased in following order: Blue SPD>Red SPD>Black B150>Yellow 4GL. The adsorption properties decreased in order Red SPD>Blue SPD> Black B150>Yellow 4GL. Decolorization of dye is not corresponded to COD values of treated dyes solution except Black B150 dye, confirming it’s complete mineralization in aqueous solution
Bi / Pb Room Temperature Superconducting Phases Of Тс=291 К, 295 K Obtained By Solar Energy, Gulamova Dilbara, Ashimov Sabir, Chigvinadze Jaba
Bi / Pb Room Temperature Superconducting Phases Of Тс=291 К, 295 K Obtained By Solar Energy, Gulamova Dilbara, Ashimov Sabir, Chigvinadze Jaba
CHEMISTRY AND CHEMICAL ENGINEERING
The purpose of the study is to obtain superconducting phases with Ts ≥ 260 K. The advanced “Solar Fast Alloys Quenching-T” technology obtained nanoscale precursors and ceramics of nominal composition Bi1.7Pb0.3 Sr2 Ca19Cu20Oy. The main crystalline phase in the precursors is the low-temperature superconducting phase Bi / Pb 2201. According to the ceramic technology, massive samples were obtained from the precursors by calcining at 840-851 oС, 3-120 hours. The microstructure, phase composition, critical temperature of the transition to the superconducting state Ts are investigated. The influence of the properties of precursors on the formation of layered microstructure of ceramics is …
Research Authentication Of The Medical Herbals By Multispectral Analysis, Kaddour Abderrahmane Ait, Safarov Jasur, Dadaev Gani
Research Authentication Of The Medical Herbals By Multispectral Analysis, Kaddour Abderrahmane Ait, Safarov Jasur, Dadaev Gani
CHEMISTRY AND CHEMICAL ENGINEERING
The article discusses the results of the study of the authentication of medicinal herbs by the method of multispectral analysis. The results of the study of the authentication of medicinal herbs motor - Allium motor and senna - Folia sennae by multispectral analysis are presented. The results of the drying process experiments carried out in the laboratory of the Tashkent State Technical University, where the processes of heat and mass transfer were reproduced during the helio-drying of medicinal herbs, are given. The results of the further study of the obtained samples of medicinal herbs in the laboratory of the VetAgro …
Investigation Polyphenol Composition Of Liquid Extract Of “Flegmen”, Olimov Nemat, Sidametova Zaynab, Sultonov Bokhodir
Investigation Polyphenol Composition Of Liquid Extract Of “Flegmen”, Olimov Nemat, Sidametova Zaynab, Sultonov Bokhodir
CHEMISTRY AND CHEMICAL ENGINEERING
Defined by qualitative reactions availability of flavonoids, saponins and essential oils in liquid extract of “Flegmen”. The qualitative composition of these compounds by method of paper chromatography in system of solvents 15%- acetic acid with the subsequent visualization 1%-spirit solution of aluminium chloride is carried out. For in-depth studying component composition of liquid extract of "Flegmen", the method of high-effective liquid chromatography is applied. Detection of these compounds indicates about completeness extraction the basic actual substances in liquid extract, that allows to judge correctness the chosen technology of extraction.
Changes In The Structure Of Nucleus, Mildness And Fries Obtained From High And Low Sorted Cotton Seeds, Akhmedov Azimjon, Suvanova Fayoza, Sagdullaeva Dilnoza, Аbdurakhimov Saidakbar
Changes In The Structure Of Nucleus, Mildness And Fries Obtained From High And Low Sorted Cotton Seeds, Akhmedov Azimjon, Suvanova Fayoza, Sagdullaeva Dilnoza, Аbdurakhimov Saidakbar
CHEMISTRY AND CHEMICAL ENGINEERING
In order to investigate the characteristics of low-grade cotton seeds process, the process of preparation of cotton seeds by means of pressing process is investigated. The distinctive features of low-grade cotton seeds have been detected by the negative impact on gravel, thermo access and other processes, which leads to change in tidal parameters. It is desirable to heat and moisture at 90 degrees Celsius so that gossypol can be exposed to maximum crude oil content, at this temperature, the separation of the protein from the is caused by the maximum breakdown of gossypol grains.
Technological Features Of Deodorization Of Local Soybean Oil, Khuzhakulova Dilbar, Mazhidov Kakhramon
Technological Features Of Deodorization Of Local Soybean Oil, Khuzhakulova Dilbar, Mazhidov Kakhramon
CHEMISTRY AND CHEMICAL ENGINEERING
The purpose of the work is to study the technological features of the deodorization of local soybean oil. Deodorization of soybean oil was carried out in laboratory and pilot plants, to analyze the composition of the original and deodorized soybean oils modern methods of physical-chemical research were used. The influence of technological parameters on the degree of deodorization of local soybean oil has been determined. By-products of deodorization of soybean oil consist of a mixture of phosphatides, unsaponifiable substances, free fatty acids, and soap. In experimental studies, distillates of deodorization range from 0.25 to 0.50% of the raw materials fed …
Influence Of The Air Flow On The Heat Of Combustion Purified Melted Sulfur, Kholmuminov Abdulfatto, Sherniyozov Bobur, Khodzhaeva Nasiba, Akhadov Alisher
Influence Of The Air Flow On The Heat Of Combustion Purified Melted Sulfur, Kholmuminov Abdulfatto, Sherniyozov Bobur, Khodzhaeva Nasiba, Akhadov Alisher
CHEMISTRY AND CHEMICAL ENGINEERING
A sample of sulfur had extracted from sulfur-containing oil and gas processing wastes by washing in water and acetone, dissolved in toluene and appreciated the purity by UV spectroscopy method. Sulfur burning is carried out on the surface of a micromesh substrate that covers the bottom of a glass cylinder connected on top of a water-jet pump to generate air flow. The transparency of the cylinder wall made it possible to visually observe the process of melting and burning sulfur at various pressures of air flow. It was revealed that up to 4-fold increase in air pressure there is a …
Study Of Heat Exchange In A Dryer With A Vortex Pseudo Liquefied Layer, Suyarova Khilola, Bakhronov Khoshim, Khudoyberdieva Nazora
Study Of Heat Exchange In A Dryer With A Vortex Pseudo Liquefied Layer, Suyarova Khilola, Bakhronov Khoshim, Khudoyberdieva Nazora
CHEMISTRY AND CHEMICAL ENGINEERING
It is established that one of the methods of intensification of convective drying of dispersed materials is the twisting of the drying agent stream. The description of the pilot installation and the result of experimental studies on the study of the first drying-heating period of the material, which was chosen as silica gel, are given. It is established that the use of the hydrodynamic effect of the centrifugal force makes it possible to substantially intensify the heat transfer from the drying agent to the particles of the material.
Developing Of Nеw Filtr Material From Rаw Materials For The Filtration Diaсetatе Cellulose Solution, Kholturaev Bahriddin, Kareva Natalya, Shahobuddinov Sirojiddin, Sarymsakov Abdushkur
Developing Of Nеw Filtr Material From Rаw Materials For The Filtration Diaсetatе Cellulose Solution, Kholturaev Bahriddin, Kareva Natalya, Shahobuddinov Sirojiddin, Sarymsakov Abdushkur
CHEMISTRY AND CHEMICAL ENGINEERING
The new filter-material based on waste of textile industry (WTI) for filtering diacetate cellulose (DС) solution has been developed. Alkaline cooking, hypochlorite and peroxide bleaching of WTI were carried out and optimal conditions of the processes were found. Filter materials were obtained that meet the required production standards, filtration time and DC filter quality (transmittance coefficient and optical density of the solution, micro-gel particles in solutions) were studied. The optimal parameters of the filtering material are found and the possibility of its use in filtering DС solutions has shown.
Polycondensation Type Anion-Exchange Polymers, Yuldashev Alisher, Mutalov Shukhrat, Nazirova Rano, Tursunov Tulkun
Polycondensation Type Anion-Exchange Polymers, Yuldashev Alisher, Mutalov Shukhrat, Nazirova Rano, Tursunov Tulkun
CHEMISTRY AND CHEMICAL ENGINEERING
The influence of the reaction temperature, the ratio of the starting materials, the amount and nature of the solvent and other factors on the polycondensation of melamine with furfural in this present work was investigated. The rate of polycondensation reaction of melamine with furfural was studied at 100, 110, 120, 130 °С, the molar ratio of melamine to furfural was constant 1.5:1.0. It was noticed that at a temperature of 100°C the duration of the polycondensation reaction is 17 hours, the exchange capacity of the ion exchanger is 4,0 mEq/g, with an increase in temperature to 120 °C the exchange …
Development Of The Composition And Research Of Anti-Corrosive Properties Of Coatings For Large-Sized Technological Equipment, Turabdjanov Sadritdin, Rakhmatov Erkin, Li Myung Suk, Ziyamukhamedova Umida
Development Of The Composition And Research Of Anti-Corrosive Properties Of Coatings For Large-Sized Technological Equipment, Turabdjanov Sadritdin, Rakhmatov Erkin, Li Myung Suk, Ziyamukhamedova Umida
CHEMISTRY AND CHEMICAL ENGINEERING
The dependence of the polarization resistance on time in salt, acidic and aqueous media of coatings based on epoxy binder filled with kaolin AKF–78, AKS–30, AKT–10 was studied. It has been established that compositions filled with kaolin of the AKT – 10 a production grade in an acidic environment — compositions filled with the kaolin of the AKF – 78 production grade possess the best protective properties against corrosion in a salt medium. The proposed compositions for protection against corrosion in saline and acidic environments
Obtaining Vinyl Acetate By Heterogeneous-Catalytic Method Using A New Catalyst, Vapoev Khusnitdin, Muhiddinov Bakhodir, Nurmonov Suvonqul, Turdieva Odina
Obtaining Vinyl Acetate By Heterogeneous-Catalytic Method Using A New Catalyst, Vapoev Khusnitdin, Muhiddinov Bakhodir, Nurmonov Suvonqul, Turdieva Odina
CHEMISTRY AND CHEMICAL ENGINEERING
The paper presents the results of a study on the production of vinyl acetate in a heterogeneous-catalytic manner in the presence of catalysts of zinc acetate/γ -Al2O3, zinc acetate/activated carbon, PHA, PHA-6, in the temperature range of 140-260 ° C and the acetylene and acetic acid molar ratio 3: 1 and 1: 5 environment of the studied catalysts turned out to be the most efficient zinc acetate/γ - Al2O3, in the presence of which a high yield of vinyl acetate is observed, at a temperature of 220 ° C and a molar ratio of acetylene and acetic acid is 4.5-5.0:1
The Study Of The Alcoholysis Regularities Of Secondary Polyethylenethertalate With The Mixture Of Polyhydric, Khudayberdiev Akhmadali, Sayidov Boysayid, Juraev Asror, Alimukhamedov Muzaffar
The Study Of The Alcoholysis Regularities Of Secondary Polyethylenethertalate With The Mixture Of Polyhydric, Khudayberdiev Akhmadali, Sayidov Boysayid, Juraev Asror, Alimukhamedov Muzaffar
CHEMISTRY AND CHEMICAL ENGINEERING
In this article the alcoholysis process conditions of secondary polyethylene terephthalate with the mixture of polyhydric alcohols have been investigated. This study has found that the aggregative state of the products of alcoholysis of secondary polyethylene terephthalate with glycerol is solid, and does not meet the requirements of the technological indicator of polyurethane foam. The structure of the resulting hydroxyl-containing polyether polyols was studied by IR spectroscopy. The influence of the physicochemical properties of alcoholysis products on the molar ratio of SPET with glycerine and the duration of the reaction has been shown. The structure and technological properties of the …
The Synthesis Of Heterocyclic Derivatives Of Phenyl(Benzoyl) Thiourea, Baltabaev Ubaydulla
The Synthesis Of Heterocyclic Derivatives Of Phenyl(Benzoyl) Thiourea, Baltabaev Ubaydulla
CHEMISTRY AND CHEMICAL ENGINEERING
By the reaction of phenylisothiocyanate, halogen-, nitrobenzoylisothiocyanates with 1-methyl-2-aminobenzimidazole in dimethylformamide at 90 ˚C for 5 hours, the corresponding phenyl (benzoyl) thiourea derivatives were obtained. Elemental analysis data and infrared spectroscopy, PMR, and chromato-mass-spectra completely confirm the structure of the synthesized thiourea derivatives.
Synthesis And Antibacterial Activity Of Iodine Containing Benzoate Derivatives, Jurayev Abdukakhkhar, Mukhamedov Ilamon
Synthesis And Antibacterial Activity Of Iodine Containing Benzoate Derivatives, Jurayev Abdukakhkhar, Mukhamedov Ilamon
CHEMISTRY AND CHEMICAL ENGINEERING
The interaction of the acid chlorides of benzoic acid derivatives with 1,1,2-triiodopropen-1-ol-3 produced new compounds, iodine-containing benzoic acid derivatives, whose structure was proved by spectral analysis data. The antibacterial properties of the synthesized compounds were studied. It was established that all the tested drugs have approximately the same antimicrobial properties against most of the test microbes taken for the study, erocolitica, Citrobacter, S. parathyphi A, B and some Shigella were more sensitive to them
Peculiarities Of Mullite Formation During Heat Treatment Of Shale From The Jerdanak Deposit, Mkrtchyan Ripsime Vachaganovna, Aripova Mastura Khikmatovna
Peculiarities Of Mullite Formation During Heat Treatment Of Shale From The Jerdanak Deposit, Mkrtchyan Ripsime Vachaganovna, Aripova Mastura Khikmatovna
CHEMISTRY AND CHEMICAL ENGINEERING
The chemical and mineralogical composition of the clay slate of the Dzherdanak deposit is determined. Four species were investigated in the natural and heat-treated state in the range of 800-1400 °C using the X-ray method. Established phase changes undergoing breed. The phase composition of the original rock, intermediate substances during roasting up to 1400 oC has been determined. The initial phases in all varieties are quartz and mica of different composition. One variety contains kaolinite. The main phases formed during high-temperature processing are mullite, quartz and cristobalite. The structure of natural and heat-treated samples was studied by scanning electron microscopy. …
Study Of The Process Of Ammonization Of Nitrogen-Acid Solutions Of The Leaving Of The Kaolin Clays Of The Angren Deposit, Kenjayev Mirjalol, Mirzakulov Kholtura, Mamadjаnov Zokir
Study Of The Process Of Ammonization Of Nitrogen-Acid Solutions Of The Leaving Of The Kaolin Clays Of The Angren Deposit, Kenjayev Mirjalol, Mirzakulov Kholtura, Mamadjаnov Zokir
CHEMISTRY AND CHEMICAL ENGINEERING
The results of investigations on the ammonization with nitric acid extract of kaolin clays from the Angrene deposit, calcined at 650-700 °C are presented. It is shown that phase aluminum it is absent from the liquido at pH above 4,5 nitrate and the liquid phase consists mainly of ammonium nitrate. Washing the precipitate of aluminum and iron hydroxides allows to obtain mixture of aluminum and iron hydroxides with content of 98,00% Al(OH)3 and 1,70% Fe(OH)3 in terms of dry matter. The viscosity is changed from 1,012cPa to 0,553 cPa at this conditions
Bi/Pb Superconducting Phases, With An Elevated Superconducting Transition Temperature, Synthesized By Solar Energy, Gulamova Dilbara
Bi/Pb Superconducting Phases, With An Elevated Superconducting Transition Temperature, Synthesized By Solar Energy, Gulamova Dilbara
CHEMISTRY AND CHEMICAL ENGINEERING
Superconductors superconductor line Bi1,7Pb0,3Sr2Ca(n-1)CunO10-δ(n=5,9,12,19) microstructure, phases compositions, critical temperature to superconducting state transition Tc was investigated. Precursors for superconductors phases synthesis by solar energy have been elaborated. The formation of superconducting homologous phases with a superconducting transition temperature in the range of 240-270 K is determined
Selection Of Optimal Conditions For The Cultivation Of Insect Cells For Use In Biotechnology, Khasanоv Shuhrat, Sasmakоv Sobir, Abdurakhmanоv Jaloliddin, Ashirоv Оybek
Selection Of Optimal Conditions For The Cultivation Of Insect Cells For Use In Biotechnology, Khasanоv Shuhrat, Sasmakоv Sobir, Abdurakhmanоv Jaloliddin, Ashirоv Оybek
CHEMISTRY AND CHEMICAL ENGINEERING
The article discusses use of the insect cell cultures for biotechnological purposes. Optimal conditions for the cultiva-tion of Spodoptera exigua and Lymantria dispar cell lines were selected.