scholarly journals Investigation on characterization and liquefaction of coals from Tavan tolgoi deposit

2014 ◽  
Vol 14 ◽  
pp. 12-19
Author(s):  
B Purevsuren ◽  
S Jargalmaa ◽  
B Bat-Ulzil ◽  
B Avid ◽  
T Gerelmaa
Keyword(s):  
Maximum Yield ◽  
Liquid Product ◽  
Coal Ash ◽  
Fluorescence Analysis ◽  
Constant Mass ◽  
Mass Ratio ◽  
X Ray ◽  
Thermal Dissolution ◽  
Ir Analysis ◽  
Coal Organic Matter

On the basis of proximate, ultimate, petrographic and IR analysis results have been confirmed that the Tavan tolgoi coal is a high-rank G mark stone coal. The results of X-ray fluorescence analysis of coal ash show that the Tavan tolgoi coal is a subbituminous coal. The ash of Tavan tolgoi coal has an acidic character. The results of pyrolysis of Tavan tolgoi coal at different heating temperatures show that a maximum yield - 5.0% of liquid product can be obtained at 700°C. The results of thermal dissolution of Tavan tolgoi coal in tetralin with constant mass ratio between coal and tetralin (1:1.8) at 450°C show that 50.0% of liquid product can be obtained after thermal decomposition of the COM (coal organic matter). DOI: http://dx.doi.org/10.5564/mjc.v14i0.191 Mongolian Journal of Chemistry 14 (40), 2013, p12-19

scholarly journals БАГАНУУРЫН ОРДЫН НҮҮРСНИЙ ШИНГЭРҮҮЛЭЛТИЙН БОЛОН ШИНЖ ЧАНАРЫН СУДАЛГАА

2016 ◽  
pp. 5-14
Author(s):  
А Ариунаа ◽  
Г Цацрал ◽  
Р Эрдэнэчимэг ◽  
Б Пүрэвсүрэн ◽  
Ж Дугаржав
Keyword(s):  
Maximum Yield ◽  
Liquid Product ◽  
Low Rank ◽  
Mass Ratio ◽  
Economic Region ◽  
Thermal Dissolution ◽  
Coal Analysis ◽  
Lignite Coal ◽  
Ir Analysis ◽  
Central Economic

The chemical characteristics, pyrolysis and thermal dissolution of Bagnuur lignite coal,  which is located in the Central economic region of Mongolia were studied. The proximate, ultimate, petrographic and IR analysis results have been confirmed that the Baganuur coal is a low-rank B2 mark lignite coal. Analysis of ash composition of the sample shows Baganuur sample has lower contents of silicium, calcium, aluminum, ferric and zincium oxides. The results of pyrolysis of Baganuur coal at different heating temperatures show that a maximum yield 7.0% of liquid product can be obtained at 600°C. The results of thermal dissolution of Baganuur coal in tetralin with constant mass ratio between coal and tetralin (1:8) at 450°C show that 40% of liquid product can be obtained after thermal decomposition of the coal organic mass.

Synthesis and Evaluation of Levulinic Ester as Biodiesel Additives

2020 ◽  
Vol 71 (8) ◽  
pp. 21-26
Author(s):  
Elena-Emilia Oprescu ◽  
Cristina-Emanuela Enascuta ◽  
Elena Radu ◽  
Vasile Lavric
Keyword(s):  
Maximum Yield ◽  
Strength Distribution ◽  
Point Of View ◽  
Reaction Parameters ◽  
X Ray ◽  
Ethyl Levulinate ◽  
Ft Ir ◽  
Ir Analysis ◽  
Biodiesel Blend ◽  
Acid Strength Distribution

In this study, the SO42-/TiO2-La2O3-Fe2O3 catalyst was prepared and tested in the conversion of fructose to ethyl levulinate . The catalyst was characterized from the point of view of the textural analysis, FT-IR analysis, acid strength distribution, X-ray powder diffraction and pyridine adsorption IR spectra. The influence of the reaction parameters on the ethyl levulinate yield was study. The maximum yield of 37.95% in levulinate esters was obtained at 180 �C, 2 g catalyst and 4 h reaction time. The effect of ethyl levulinate addition to diesel-biodiesel blend in different rates, i.e, 0.5, 1, 2.5, 5 (w.t %) on density, kinematic viscosity and flash point was evaluated and compared with the European specification.

Synthesis of Biodiesel from Castor Oil Catalyzed by Cesium Phosphotungstate with the Assistance of Microwave

2013 ◽  
Vol 291-294 ◽  
pp. 300-306 ◽  
Author(s):  
Hong Yuan ◽  
Qing Shu
Keyword(s):  
Microwave Radiation ◽  
Castor Oil ◽  
Solid Acid ◽  
Maximum Yield ◽  
Conventional Heating ◽  
Molar Ratio ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Programmed

Two cesium phosphotungstate-derived solid acid catalysts (Cs2.5H0.5PW12 and Cs0.5H2.5PW12) were prepared. The resulting catalysts were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption and desorption isotherm and temperature programmed desorption of ammonia(NH3-TPD). The Cs2.5H0.5PW12 and Cs0.5H2.5PW12 were respectively used to catalyze the tranesterification of castor oil and methanol for the synthesis of biodiesel with the assistance of microwave. Results shown microwave radiation can greatly enhance the transesterification process when compared with conventional heating method. Cs2.5H0.5PW12 showed better catalyst performance than Cs0.5H2.5PW12. A maximum yield of 90% was obtained from the using of 30:1 molar ratio of methanol to castor oil and 15 wt % mass ratio of catalyst to castor oil at 343 K under microwave radiation after 4h.

scholarly journals DETERMINATION OF ASH CONTENT IN COAL BY X-RAY FLUORESCENCE ANALYSIS Authors D Baimolda

2021 ◽  
Vol 73 (1) ◽  
pp. 82-84
Author(s):  
D. Baimolda ◽  
◽  
T. Cechak ◽  
Sh. Shyngysova ◽  
◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Coal Ash ◽  
Fluorescence Analysis ◽  
Ash Content ◽  
Environmental Damage ◽  
Coal Quality ◽  
X Ray ◽  
Burning Coal

This article discusses the advantages of X-ray fluorescence analysis (XRF) techniques for the determination of ash in coal. The quality of coal depends on the amount of ash contained in it. On the other hand, ash causes irreversible environmental damage when using coal as a source of energy. Since coal is considered as the most important source of energy, coal quality is directly related to ash, which correlates with its non-combustible minerals and elements. Some elements such as S (sulfur), Ti (titanium), Ca (calcium), Fe (iron) after burning coal can have an adverse impact on the environment. Thus, we have demonstrated in this study how we can determine the ash content consisting of noncombustible minerals in the composition of coal and, thus, assess the quality of coal using X-ray fluorescence research. It also describes how we can determine coal ash samples using the XRF analyzer 123-1 in online, which is one of the most optimal methods in nuclear physics.

scholarly journals Property of upgraded solid and liquid products from Baganuur lignite by thermal reaction with solvent

2018 ◽  
pp. 39-47
Author(s):  
Ariunaa A ◽  
Otgonchuluun D ◽  
Purevsuren B ◽  
Davaajav Ya
Keyword(s):  
Thermal Decomposition ◽  
Liquid Product ◽  
Thermal Reaction ◽  
Low Rank ◽  
Spectrometric Analysis ◽  
Ftir Analysis ◽  
Constant Mass ◽  
Mass Ratio ◽  
Organic Mass ◽  
Liquid Products

The coal of Baganuur deposit have been investigated to determine its technical characteristics, elemental and petrographical maceral compositions. On the basis of proximate, ultimate, petrographic and FTIR analysis, the obtained results have confirmed that the Baganuur coal is a low rank lignite B2 mark. The liquid tar, produced through thermolysis of Baganuur coal, was investigated by FTIR, 13C and 1H NMR spectrometric analysis. The results of thermolysis of Baganuur coal in tetralin has a constant mass ratio between coal and tetralin (1:1.8) at 450°C, which shows that 40.0% of liquid product can be obtained after thermal decomposition of the coal organic mass.

Application of the Fundamental Parameters Model to Energy-Dispersive X-Ray Fluorescence Analysis of Complex Silicates

1979 ◽  
Vol 23 ◽  
pp. 71-76
Author(s):  
Peggy Dalheim
Keyword(s):  
Coal Ash ◽  
Fluorescence Analysis ◽  
Energy Dispersive ◽  
Calibration Constant ◽  
Empirical Methods ◽  
X Ray ◽  
Fundamental Parameters ◽  
Ideal Approach ◽  
Geologic Samples ◽  
Complicated Task

The elemental analysis of geologic samples such as rocks, minerals and coal ash is a complicated task because of their wide, complex compositional range. Energy dispersive x-ray fluorescence (EDXRF) can provide a rapid, accurate and precise way of analyzing geologic samples. Two approaches to reducing EDXRF intensity data to elemental concentrations are the empirical approach and the fundamental parameters (theoretical) approach. Empirical methods require numerous standards within restricted compositional ranges so can become complex, time consuming and, therefore, expensive if diverse suites of samples are to be analyzed for many elements. Fundamental parameters, on the other hand, requires knowledge of physical constants such as mass absorption coefficients, jump ratios and fluorescent yields, and only one matrix independent standard to calculate a calibration constant for each element making it an ideal approach to the analysis of diverse geologic samples.

scholarly journals Investigation of the possibility of the reutilization of some industrial wastes

2005 ◽  
Vol 70 (6) ◽  
pp. 843-851 ◽  
Author(s):  
A. Kostic-Pulek ◽  
S. Marinkovic ◽  
S. Popov ◽  
J. Djinovic
Keyword(s):  
Atmospheric Pressure ◽  
Room Temperature ◽  
Bottom Ash ◽  
Calcium Sulphate ◽  
Industrial Wastes ◽  
Mass Ratio ◽  
Solid Mass ◽  
X Ray ◽  
Mass Ratios ◽  
Ir Analysis

The utilization of nitrogypsum and bottom ash, wastes from the factory "Milan Blagojevic" (Lucani?Serbia), was investigated. For this purpose, mixtures composed of calcined nitrogypsum (CaSO4. 0,5H2O), ash (mass ratio 1:1) and water (water/solid mass ratio 0.5), as well as similar mixtures consisting of 1.0 mass%5.0 mass%10.0mass%of lime (CaO) with the same gypsum/ash and water/solid mass ratios, were prepared. These mixtures gave solidified products at room temperature and atmospheric pressure, which after 28 days had satisfactory compressive strengths for application in the civil industry. The product with 5.0mass%of added lime has the best mechanical characeristics. X-ray and qualitative IR analysis showed that this product mainly consisted of calcium sulphate dihydrate (CaSO4.2H2O) and carbonates, as well as a small quantity of ettringite (3CaO.Al2O3.3CaSO4.32H2O).

scholarly journals INVESTIGATION AND OPTIMIZATION OF COMPLEXATION OF MANGANESE (II) IONS WITH DIHY-DROQUERCETIN IN AQUEOUS SOLUTIONS

2020 ◽  
pp. 47-56
Author(s):  
Yelena Vladimirovna Stolpovskaya ◽  
Natalya Nikolaevna Trofimova ◽  
Vasily Anatolyevich Babkin ◽  
Spartak Spiridonovich Khutsishvili ◽  
Roman Georgievich Zhitov ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Maximum Yield ◽  
Bound Water ◽  
Fluorescence Analysis ◽  
Molar Ratio ◽  
Complexation Reaction ◽  
Stoichiometric Ratio ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Molar Ratios

The purpose of this work was to study and optimize the complexation reaction of Mn2+ ions with flavonoid dihydroquercetin (DHQ) in aqueous solutions. It was found that the interaction of DHQ (0.015–0.030 M) with manganese (II) salts at molar ratios of DHQ : Mn2+ from 1 : 1 to 1 : 3 at pH 6.9–7.9 leads to the formation of a complex compound (CC) with a stoichiometric ratio of metal : flavonoid ligand (Met : L) 1 : 1. The conditions for the complexation of Mn2+ ions with dihydroquercetin at laboratory conditions optimized for the yield of the product, are proposed. The maximum yield of the complex (95%) was achieved at the interaction of DHQ with Mn(CH3COO)2∙4H2O under conditions: pH 7.7, 70 °C, the reaction time was 15 min, the molar ratio of the initial reagents DHQ: Mn2+ was 1 : 1.5, the initial concentrations were 0.020 M DHQ and 0.030 M Mn2+. The most probable composition of the complex with the determination of the amount of bound water [MnL(OH)(H2O)2] and the structure of the complex were established using the data of thermogravimetry (TG), differential scanning calorimetry (DSC), elemental analysis and X-ray fluorescence analysis (XRF), confirmed by the data of total reflection X-ray fluorescence analysis (TXRF), and EPR spectroscopy data.

scholarly journals Thermal processing of Khoot coal and characterization of obtained solid and liquid products

2014 ◽  
Vol 15 ◽  
pp. 66-72
Author(s):  
S Batbileg ◽  
B Purevsuren ◽  
Ya Davaajav ◽  
J Namkhainorov
Keyword(s):  
Activated Carbon ◽  
Liquid Product ◽  
Sem Analysis ◽  
Spectrometric Analysis ◽  
Water Steam ◽  
Initial Coal ◽  
Thermal Dissolution ◽  
Liquid Products ◽  
Ir Analysis

On 21st January 2015, the abstract of this paper was replaced with the correct abstract.The coal of Khoot deposit have been investigated and determined the technical characteristics, elemental and petrographical maceral compositions. On the basis of proximate, ultimate, petrographic and IR analysis results have been confirmed that the Khoot coal is a sub-bituminous coal. The hard residue after pyrolysis have been activated by heated water steam and determined the iodine and methylene blue adsorption of initial coal and activated carbon samples from pyrolysis hard residue. The porosity structure of initial coal, activated carbon of pyrolysis hard residue and hard residue after thermolysis (thermal dissolution) have been determined by SEM analysis. The liquid tar product of thermolysis of Khoot coal was investigated by FTIR, 13C and 1H NMR spectrometric analysis. The results of thermolysis of Khoot coal in tetralin with constant mass ratio between coal and tetralin (1:1.8) at 450°C show that 60.8% of liquid product can be obtained after thermolysis of the coal organic mass.DOI: http://doi.dx.org/10.5564/mjc.v15i0.326 Mongolian Journal of Chemistry 15 (41), 2014, p66-72

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