TY  - JOUR
AU  - Aleksić, Bojana D.
AU  - Aleksić, Bogdan R.
AU  - Marković, Bojana
AU  - Cvetković, Olga
AU  - Ercegovac, M.D.
AU  - Vitorović, Dragomir K.
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/24
AB  - The behaviour of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-molybdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (-86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Direct liquefaction of soft brown coal from the Kosovo Basin
T1  - Likvefakcija mekog mrkog uglja Kosovskog Basena
VL  - 6
IS  - 2
SP  - 265
EP  - 270
UR  - https://hdl.handle.net/21.15107/rcub_cer_24
ER  - 

@article{
author = "Aleksić, Bojana D. and Aleksić, Bogdan R. and Marković, Bojana and Cvetković, Olga and Ercegovac, M.D. and Vitorović, Dragomir K.",
year = "2000",
abstract = "The behaviour of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-molybdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (-86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Direct liquefaction of soft brown coal from the Kosovo Basin, Likvefakcija mekog mrkog uglja Kosovskog Basena",
volume = "6",
number = "2",
pages = "265-270",
url = "https://hdl.handle.net/21.15107/rcub_cer_24"
}

Aleksić, B. D., Aleksić, B. R., Marković, B., Cvetković, O., Ercegovac, M.D.,& Vitorović, D. K.. (2000). Direct liquefaction of soft brown coal from the Kosovo Basin. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 6(2), 265-270.
https://hdl.handle.net/21.15107/rcub_cer_24

Aleksić BD, Aleksić BR, Marković B, Cvetković O, Ercegovac M, Vitorović DK. Direct liquefaction of soft brown coal from the Kosovo Basin. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2000;6(2):265-270.
https://hdl.handle.net/21.15107/rcub_cer_24 .

Aleksić, Bojana D., Aleksić, Bogdan R., Marković, Bojana, Cvetković, Olga, Ercegovac, M.D., Vitorović, Dragomir K., "Direct liquefaction of soft brown coal from the Kosovo Basin" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 6, no. 2 (2000):265-270,
https://hdl.handle.net/21.15107/rcub_cer_24 .

TY  - JOUR
AU  - Aleksić, Bojana D.
AU  - Aleksić, Bogdan R.
AU  - Marković, Branislav Ž.
AU  - Cvetković, Olga
AU  - Ercegovac, Marko D.
AU  - Vitorović, Dragomir K.
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/20
AB  - The behavior of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-moly­bdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (~86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.
AB  - Ispitivano je ponašanje mekog mrkog uglja Kosovskog basena (Jugoslavija) pri direktnoj likvefakciji. Katalitička hidrogenizacija izvođena je u protočnom šaržnom reaktoru propuštanjem vodonika kroz suspenziju tetralina i usitnjenog uglja, u prisustvu komercijalnog presulfidiziranog CO-MO/AI2O3 katalizatora. Eksperimenti su izvođeni na temperaturi 365 i 440°C, pritisku 13,5 i 15,0 MPa, u trajanju 1-8 sati. Reaktivnost uglja je procenjivana i ukupna totalna konverzija izračunavana je na osnovu prinosa tečnih proizvoda rastvornih u n-heptanu (laka ulja), asfaltena (proizvodi nerastvorni u n-heptanu) i čvrstog ostatka. Konverzija uglja pri navedenim uslovima iznosila je oko 80 %, a najveća je bila (~86 %) pri najdužem reakcionom vremenu. Mikropetrografskom analizom identifikovane su različite vrste zrna modifikovanog uglja kao i novo stvoreni tipovi zrna uglja kao i mineralnog materijala. Dobijeni rezultati ukazuju da se gasovi oslobađaju u početnim fazama hidrogenizacije, a da polimerizacijom tečnih proizvoda polu-koks i koks postaju u kasnijim fazama hidrogenizacije.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Direct liquefaction of soft brown coal from the Kosovo basin
T1  - Likvefakcija mekog mrkog uglja kosovskog basena
VL  - 54
IS  - 6
SP  - 265
EP  - 269
UR  - https://hdl.handle.net/21.15107/rcub_cer_20
ER  - 

@article{
author = "Aleksić, Bojana D. and Aleksić, Bogdan R. and Marković, Branislav Ž. and Cvetković, Olga and Ercegovac, Marko D. and Vitorović, Dragomir K.",
year = "2000",
abstract = "The behavior of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-moly­bdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (~86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages., Ispitivano je ponašanje mekog mrkog uglja Kosovskog basena (Jugoslavija) pri direktnoj likvefakciji. Katalitička hidrogenizacija izvođena je u protočnom šaržnom reaktoru propuštanjem vodonika kroz suspenziju tetralina i usitnjenog uglja, u prisustvu komercijalnog presulfidiziranog CO-MO/AI2O3 katalizatora. Eksperimenti su izvođeni na temperaturi 365 i 440°C, pritisku 13,5 i 15,0 MPa, u trajanju 1-8 sati. Reaktivnost uglja je procenjivana i ukupna totalna konverzija izračunavana je na osnovu prinosa tečnih proizvoda rastvornih u n-heptanu (laka ulja), asfaltena (proizvodi nerastvorni u n-heptanu) i čvrstog ostatka. Konverzija uglja pri navedenim uslovima iznosila je oko 80 %, a najveća je bila (~86 %) pri najdužem reakcionom vremenu. Mikropetrografskom analizom identifikovane su različite vrste zrna modifikovanog uglja kao i novo stvoreni tipovi zrna uglja kao i mineralnog materijala. Dobijeni rezultati ukazuju da se gasovi oslobađaju u početnim fazama hidrogenizacije, a da polimerizacijom tečnih proizvoda polu-koks i koks postaju u kasnijim fazama hidrogenizacije.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Direct liquefaction of soft brown coal from the Kosovo basin, Likvefakcija mekog mrkog uglja kosovskog basena",
volume = "54",
number = "6",
pages = "265-269",
url = "https://hdl.handle.net/21.15107/rcub_cer_20"
}

Aleksić, B. D., Aleksić, B. R., Marković, B. Ž., Cvetković, O., Ercegovac, M. D.,& Vitorović, D. K.. (2000). Direct liquefaction of soft brown coal from the Kosovo basin. in Hemijska industrija
Association of Chemical Engineers of Serbia., 54(6), 265-269.
https://hdl.handle.net/21.15107/rcub_cer_20

Aleksić BD, Aleksić BR, Marković BŽ, Cvetković O, Ercegovac MD, Vitorović DK. Direct liquefaction of soft brown coal from the Kosovo basin. in Hemijska industrija. 2000;54(6):265-269.
https://hdl.handle.net/21.15107/rcub_cer_20 .

Aleksić, Bojana D., Aleksić, Bogdan R., Marković, Branislav Ž., Cvetković, Olga, Ercegovac, Marko D., Vitorović, Dragomir K., "Direct liquefaction of soft brown coal from the Kosovo basin" in Hemijska industrija, 54, no. 6 (2000):265-269,
https://hdl.handle.net/21.15107/rcub_cer_20 .

TY  - JOUR
AU  - Aleksić, Bogdan R.
AU  - Ercegovac, Marko D.
AU  - Cvetković, Olga
AU  - Marković, Branislav Ž.
AU  - Aleksić, Bojana D.
AU  - Vitorović, Dragomir
PY  - 1998
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5858
AB  - The behaviour of the soft brown coal from the Kostolac Mine (Serbia, Yugoslavia) was investigated during hydroliquefaction carried out in a batch reactor by direct catalytic hydrogenation of the pulverized coal (- 160 μm) dispersed in tetralin. The effects of temperature (ranging from 365 to 440°C), pressure (13.5 to 15.0 MPa) and residence time (1 to 8 h) on the yield of individual liquefaction products as well as the petrographic composition of the coal residues were closely followed by separation and analysis of the products. These consisted of liquid products soluble in n-heptane (light oils), n-heptane insoluble products (asphaltenes), the solid coal residue and gaseous products. A good reactivity of this soft brown coal was observed. The yield of liquid products varied from 23 to 64 wt.% (based on dry ash-free coal). A total coal conversion of 80 to 86% was achieved. Petrographic composition and optical properties of the solid coal residues were analyzed microscopically in order to establish the character and intensity of the coal changes. The solid residues were found to consist of 12 various grain categories. The low proportions of unreacted or partly reacted coal grains confirmed the good reactivity of the Kostolac soft brown coal in the applied liquefaction process.
PB  - Elsevier B.V.
T2  - Fuel Processing Technology
T1  - Direct hydroliquefaction of a low rank soft brown coal
VL  - 58
IS  - 1
SP  - 33
SP  - 43
DO  - 10.1016/S0378-3820(98)00079-4
ER  - 

@article{
author = "Aleksić, Bogdan R. and Ercegovac, Marko D. and Cvetković, Olga and Marković, Branislav Ž. and Aleksić, Bojana D. and Vitorović, Dragomir",
year = "1998",
abstract = "The behaviour of the soft brown coal from the Kostolac Mine (Serbia, Yugoslavia) was investigated during hydroliquefaction carried out in a batch reactor by direct catalytic hydrogenation of the pulverized coal (- 160 μm) dispersed in tetralin. The effects of temperature (ranging from 365 to 440°C), pressure (13.5 to 15.0 MPa) and residence time (1 to 8 h) on the yield of individual liquefaction products as well as the petrographic composition of the coal residues were closely followed by separation and analysis of the products. These consisted of liquid products soluble in n-heptane (light oils), n-heptane insoluble products (asphaltenes), the solid coal residue and gaseous products. A good reactivity of this soft brown coal was observed. The yield of liquid products varied from 23 to 64 wt.% (based on dry ash-free coal). A total coal conversion of 80 to 86% was achieved. Petrographic composition and optical properties of the solid coal residues were analyzed microscopically in order to establish the character and intensity of the coal changes. The solid residues were found to consist of 12 various grain categories. The low proportions of unreacted or partly reacted coal grains confirmed the good reactivity of the Kostolac soft brown coal in the applied liquefaction process.",
publisher = "Elsevier B.V.",
journal = "Fuel Processing Technology",
title = "Direct hydroliquefaction of a low rank soft brown coal",
volume = "58",
number = "1",
pages = "33-43",
doi = "10.1016/S0378-3820(98)00079-4"
}

Aleksić, B. R., Ercegovac, M. D., Cvetković, O., Marković, B. Ž., Aleksić, B. D.,& Vitorović, D.. (1998). Direct hydroliquefaction of a low rank soft brown coal. in Fuel Processing Technology
Elsevier B.V.., 58(1), 33.
https://doi.org/10.1016/S0378-3820(98)00079-4

Aleksić BR, Ercegovac MD, Cvetković O, Marković BŽ, Aleksić BD, Vitorović D. Direct hydroliquefaction of a low rank soft brown coal. in Fuel Processing Technology. 1998;58(1):33.
doi:10.1016/S0378-3820(98)00079-4 .

Aleksić, Bogdan R., Ercegovac, Marko D., Cvetković, Olga, Marković, Branislav Ž., Aleksić, Bojana D., Vitorović, Dragomir, "Direct hydroliquefaction of a low rank soft brown coal" in Fuel Processing Technology, 58, no. 1 (1998):33,
https://doi.org/10.1016/S0378-3820(98)00079-4 . .

TY  - JOUR
AU  - Vitorović, Dragomir
AU  - Aleksić, Bogdan R.
AU  - Ercegovac, Marko
AU  - Aleksić, Bojana D.
AU  - Kontorovič, Svetlana I.
AU  - Marković, Branislav Ž.
AU  - Cvetković, Olga
AU  - Mitrovski, Svetlana M.
PY  - 1994
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5859
AB  - The behaviour of Kolubara soft brown coal during direct liquefaction by catalytic hydrogenation was studied and was compared with the Banovići brown coal investigated previously. A sample of washed and dried coal was ground dry, or was ground in the presence of different liquids. Addition of water during grinding resulted in a somewhat coarser granular composition, while n-heptane did not have a noticeable effect. High reactivity of the soft brown coal, which initially was indicated by thermal analysis, was confirmed by high yields of liquid products, particularly of oils soluble in n-heptane. The solid liquefaction residues did not contain pyrolytic carbon and cenospheres, and contained a low proportion of humoplasts indicating the high liquefaction efficiency of the coal in spite of its high content of xylite.
PB  - Elsevier B.V.
T2  - Fuel
T1  - Liquefaction behaviour of Kolubara soft brown coal
VL  - 73
IS  - 11
SP  - 1757
EP  - 1765
DO  - 10.1016/0016-2361(94)90164-3
ER  - 

@article{
author = "Vitorović, Dragomir and Aleksić, Bogdan R. and Ercegovac, Marko and Aleksić, Bojana D. and Kontorovič, Svetlana I. and Marković, Branislav Ž. and Cvetković, Olga and Mitrovski, Svetlana M.",
year = "1994",
abstract = "The behaviour of Kolubara soft brown coal during direct liquefaction by catalytic hydrogenation was studied and was compared with the Banovići brown coal investigated previously. A sample of washed and dried coal was ground dry, or was ground in the presence of different liquids. Addition of water during grinding resulted in a somewhat coarser granular composition, while n-heptane did not have a noticeable effect. High reactivity of the soft brown coal, which initially was indicated by thermal analysis, was confirmed by high yields of liquid products, particularly of oils soluble in n-heptane. The solid liquefaction residues did not contain pyrolytic carbon and cenospheres, and contained a low proportion of humoplasts indicating the high liquefaction efficiency of the coal in spite of its high content of xylite.",
publisher = "Elsevier B.V.",
journal = "Fuel",
title = "Liquefaction behaviour of Kolubara soft brown coal",
volume = "73",
number = "11",
pages = "1757-1765",
doi = "10.1016/0016-2361(94)90164-3"
}

Vitorović, D., Aleksić, B. R., Ercegovac, M., Aleksić, B. D., Kontorovič, S. I., Marković, B. Ž., Cvetković, O.,& Mitrovski, S. M.. (1994). Liquefaction behaviour of Kolubara soft brown coal. in Fuel
Elsevier B.V.., 73(11), 1757-1765.
https://doi.org/10.1016/0016-2361(94)90164-3

Vitorović D, Aleksić BR, Ercegovac M, Aleksić BD, Kontorovič SI, Marković BŽ, Cvetković O, Mitrovski SM. Liquefaction behaviour of Kolubara soft brown coal. in Fuel. 1994;73(11):1757-1765.
doi:10.1016/0016-2361(94)90164-3 .

Vitorović, Dragomir, Aleksić, Bogdan R., Ercegovac, Marko, Aleksić, Bojana D., Kontorovič, Svetlana I., Marković, Branislav Ž., Cvetković, Olga, Mitrovski, Svetlana M., "Liquefaction behaviour of Kolubara soft brown coal" in Fuel, 73, no. 11 (1994):1757-1765,
https://doi.org/10.1016/0016-2361(94)90164-3 . .