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Chemistry for Sustainable Development

2004 year, number 6

Investigation of Thermal Transformations of the Barzas Sapromixite under Autoclave Conditions

V. I. Sharypov1, B. N. Kuznetsov1, N. G. Beregovtsova1, S. V. Baryshnikov1 and N. Yu. Vasilieva2
1Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences,
Ul. K. Marksa 42, Krasnoyarsk 660049 (Russia), E-mail: sharypov@icct.ru
2Krasnoyarsk State University, Pr. Svobodny 79, Krasnoyarsk 660041 (Russia)
Pages: 719-725

Abstract

Thermal transformations of sapromixite from the Barzas deposit are investigated under the conditions of pyrolysis processes in an inert atmosphere, hydropyrolysis in the atmosphere of hydrogen, thermal dissolution in the residue from oil refining and catalytic hydrogenation. It is shown that sapromixite can be transformed with a high yield into liquid hydrocarbon products. The main products of this transformation is the fraction of liquid hydrocarbons with boiling point above 180 oC; its yield from sapromixite is substantially (up to 7.7 times during pyrolysis) higher than the corresponding value for brown coal. The highest degree of sapromixite conversion into liquid and gaseous products was achieved for its pyrolysis in the atmosphere of hydrogen and for hydrogenation in the presence of mechanically activated iron-ore catalyst. For hydrogenation, maximal conversion of sapromixite reaches 94-97mass % at a temperature within 400-430oC. For hydropyrolysis of sapromixite, the degree of conversion increases with an increase in the process temperature and reaches 78-80mass % at 430-460oC. Further temperature rise causes a sharp increase in the amount of gas formed and a decrease in the yield of liquid products. The application of iron-ore catalyst during hydrogenation allows one to increase the sapromixite conversion degree by 21-23% and to achieve total yield of liquid products of hydropyrolysis up to 58 mass % with rather low gas formation.