For replacing the cost and time consuming 13 C DP-MAS NMR spectroscopy reliable models describing the development of the carbon aromaticity of pyrolysis chars with increasing process temperature should be evolved by means of the micropetrographic parameters reflection, remission, Vickers microhardness and content of semicoke. It has shown that componential constitution and remission is rather caused by the process temperature and depends therefore only indirectly on the aromaticity. The parameters' reflectance and microhardness, however, increase with increasing aromaticity due to the higher molecular ordering, even if the relationship is not linear. All obtained correlations are highly significant and well fitted, but the model concerning the reflectance leads to most appropriate results. [Received: October 29, 2014; Accepted: December 28, 2014] Keywords: 13 C DP-MAS NMR; aromaticity; char; lignite; Vickers microhardness; pyrolysis; reflection; remission; semicoke.Reference to this paper should be made as follows: Gerschel, H. and Schmidt, M. (2016) 'Modelling the relationship between carbon aromaticity of lignite pyrolysis chars and the process temperature with petrographic parameters', Int. J. Oil, Gas and Coal Technology, Vol. 11, No. 3, Biographical notes: Henny Gerschel holds an MSc in Depositional Geology of Fossil Fuels. Her current research interests include petrographic classification and analysis of pyrolysis residues. She is a scientific employee at the Technical University of Freiberg working on the research project DER in cooperation with RWE, Vattenfall, MIBRAG and ROMONTA. Modelling the relationship between carbon aromaticity 291Mirjam Schmidt holds a Diploma in Chemistry. Her current research interests include analytical molecular spectroscopy of solid and liquid fossil fuels. She is a scientific employee at the Technical University of Freiberg working on the research project DER in cooperation with RWE, Vattenfall, MIBRAG and ROMONTA. This paper is a revised and expanded version of a paper entitled 'Modelling the aromaticity of lignite pyrolysis chars with petrographic parameters in relation to the process temperature' presented at the 6th International Freiberg

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