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Gyul'Maliev A.M.,RAS Topchiev Institute of Petrochemical Synthesis | Maloletnev A.S.,Moscow State Mining University | Kairbekov Z.K.,Al Farabi State University of Kazakhstan | Emel'Yanova V.S.,Al Farabi State University of Kazakhstan | Myltykbaeva Z.K.,Al Farabi State University of Kazakhstan
Solid Fuel Chemistry | Year: 2014

Based on the thermodynamic calculations of the equilibrium composition of the gasification products of shale from the Kendyrlyk deposit (Republic of Kazakhstan) (air blast coefficient α = 0.3; pressure, 0.1 MPa) with consideration for the chemical composition of the ash of mineral components (SiO2, Al2O3, Fe2O3, CaO, MgO, K2O, and Na2O) and the concentrations of trace elements (Cu, Sr, Zn, Cr, Ti, Mn, and Ni) in it, the constituents of a gas phase (the most probable of 500 substances) were determined depending on the process temperature. The equilibrium compositions of gas and condensed phases at a temperature of 1185.65 K were calculated using the HSC Chemistry software. © 2014 Allerton Press, Inc. Source


Gyul'Maliev A.M.,RAS Topchiev Institute of Petrochemical Synthesis | Kairbekov Zh.K.,Al Farabi State University of Kazakhstan | Maloletnev A.S.,Moscow State Mining University | Emel'Yanova V.S.,Al Farabi State University of Kazakhstan | Maltykbaeva Zh.K.,Al Farabi State University of Kazakhstan
Solid Fuel Chemistry | Year: 2013

The temperature dependence of the products of the gasification of oil shale from the Kenderlyk deposit was studied by the methods of chemical thermodynamics. A comparative analysis of gasification products with air and air-steam blasts was carried out. It was found that, in the case of the air-steam blast at temperatures higher than 850 C, carbon entirely reacted and CO and H2 were the products of gasification. © 2013 Allerton Press, Inc. Source


Ryabikin Yu.A.,Physicotechnical Institute | Kairbekov Zh.K.,Al Farabi State University of Kazakhstan | Zashkvara O.V.,Physicotechnical Institute | Eshova Zh.T.,Al Farabi State University of Kazakhstan
Solid Fuel Chemistry | Year: 2011

Results of a study of the paramagnetic characteristics of brown coal from the Kiyaktinskoe deposit (Kazakhstan) in a native state and after mechanical treatment and electron irradiation are reported. The effects of these actions on changes in the paramagnetic properties of the test coal and on the intensification of a coal hydrogenation process are discussed. It was found that the concentration of free radicals changed only slightly after mechanical treatment in a ball mill at room temperature in an atmosphere of air, whereas the concentration of Fe3+ ions noticeably increased. Upon the electron irradiation of coal, the dose depen- dence of the concentration of free radicals passed through a maximum at a dose of 100 kGy. At the same radi- ation dose, the yield of a kerosene-gas oil fraction upon the hydrogenation of Kiyaktinskoe coal increased, and the total yield of liquid products increased upon the irradiation of coal and a catalyst (bauxite 094) to a dose of 100 kGy. It was hypothesized that Fe3+ ions, which were additionally formed upon coal grinding and irradiation, can serve as an internal catalyst in the course of coal hydrogenation. © 2011 Allerton Press, Inc. Source


Gyul'maliev A.M.,RAS Topchiev Institute of Petrochemical Synthesis | Kairbekov Z.K.,Al Farabi State University of Kazakhstan | Maloletnev A.S.,Moscow State Mining University | Myltykbaeva Z.K.,Al Farabi State University of Kazakhstan
Solid Fuel Chemistry | Year: 2014

The kinetic characteristics of the formation of liquid products by the hydrogenation of coal from the Karazhir deposit (Republic of Kazakhstan) were studied. Two kinetic models were considered to describe nonlinear (parallel-consecutive reactions) and linear (consecutive reactions) schemes. Within the frame-work of each particular reaction scheme, analytical equations were obtained to describe the yields of fractions with boiling points to 200, 200–350, and above 350°C; gas; and solid residue depending on time and corresponding calculations were performed. A comparative analysis of the experimental results was carried out according to the two kinetic schemes. © 2014, Allerton Press, Inc. Source


Maloletnev A.S.,Moscow State Mining Institute NITU MISiS | Kairbekov Z.K.,Al Farabi State University of Kazakhstan | Smagulova N.T.,Al Farabi State University of Kazakhstan | Kairbekov A.Z.,Al Farabi State University of Kazakhstan
Solid Fuel Chemistry | Year: 2016

The results of studies on the application of a catalytic composition synthesized based on finely dispersed silicon-containing natural clay from the Narynkol deposit (Republic Kazakhstan) and a water-soluble silicon salt (Ba–Al–Si) to the process of the catalytic cracking of the semicocking tar of coal from the Shubarkol deposit are reported. It was established that, in the presence of this composition, the yield of a gasoline fraction at a temperature of 420°C and an argon pressure of 3.0 MPa was 34%, and the yield of a diesel fraction was 50%; this fact makes it possible to consider coal tar as a potential raw material for the production of motor fuel components. © 2016, Allerton Press, Inc. Source

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