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Solvolyse de charbons et de leurs macéraux

Abstract : The solvolysis of coals represent an important way to access to coal structure, in relation to his utilization in carbonization, liquefaction or gazeification. The aim of our work was locussed on coal solvolysis and characterization of the solvolysis products obtained from coals and macerals. The N-methyl 2 Pyrrolidinone (NMP) extraction, which is a physical process of solvolysis and the solubilization by the mixture methanol/sodium hydroxide (MeOH/NaOH) were realized to study the molecular structure of coal. Coal was considered in the frame of this study, as a three-dimensional crosslinked network or "macromolecular phase" (MM), which trapped free molecules that are not covalenty bonded to the network and constituated the molecular phase (M). The comparison of the results of the extraction and the characterization of coals, macerals and extracted products by spectroscopic methods (FT/IR, Solid state 13C NMR and EPR) allowed us to consider the notion of molecular structure rather than the maceral one to explain the behaviour of coals during solvolysis. A complementary analysis by thermic methods coupled to mass spectrometry (TD GC/MS, Py-FIMS) of solvolysis products permitted us to suggest that a part of the molecular phase is not extractable by solvents and stays linked to macromolecular phase. Therefore, the hypothesis of a "two-components" structure represents a simplified model. At last, the influence of the two phases "molecular M and macromolecular MM" on optical properties of cokes obtained by carbonization of coals and extracted products was studied. We have proved by the study with Transmission Electronic Microscopy TEM the important role of the composition determined by fractionation (sonication US and extrography EX) of the NMP extractible phase on the thermal behaviour of coals
Mots-clés : Solvolyse Macéraux
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Submitted on : Tuesday, April 24, 2018 - 3:45:31 PM
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Catherine Wilhelm. Solvolyse de charbons et de leurs macéraux. Chimie. Université Paul Verlaine - Metz, 1990. Français. ⟨NNT : 1990METZ015L⟩. ⟨tel-01775866⟩



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