Composition and Structure of Coal Organic Mass. 3. Dinamics of Coal Chemical Structure During Metamorphism

Abstract

Dynamics of coal chemical structure during metamorphism has been evaluated using mathematical model of metamorphism kinetics attached to the time axis in accordance with artificial coalification data.

Composition and Structure of Coal Organic Mass. 2. Kinetic Models of Metamorphism

“…In accordance with the existing conceptions [1], during natural coalification, which generates fuel chemical potential, gaseous and liquid products of metamorphism leave the "reaction zone", which is followed by the decrease of fixed residue mass and alteration of its elemental composition (mass contents of carbon ( q C ), hydrogen (q H ), oxygen (q O ), nitrogen (q N ), and sulphur (q S )) as a result of different reactions rates of the mentioned elements.…”

“…It is necessary to note the agreement between experimental data concerning elementary chemical structures and their molecular masses, which are given in [1] in the discussion of the "guest-master" model, as well as peculiarities of metamorphism interval near R 0 = 0.9 with the results of our model of artificial coalification. Thus, at n =22 the C n H 2n-28 O coincides with theoretically averaged structure C 22 H 16 O of the coal with R 0 = 0.9, characterized by equal mass contents of hydrogen and oxygen.…”

“…As a source of the facts for kinetic investigations the data of artificial coalification as an experimental model of natural metamorphism were used. The process is described in [1] and the experimental results are represented in Table 1. The data from Table 1, like in [2], are bound to the scale of maximum paleosinking (according to Levenstein).…”

Desulphurization and Usage of Medium-Metamorphized Black Coal. 2. Desulphurized Coal Used as an Additive for the Production of Special Types of Coke

“…It is known that the reactions between carbon and CO 2 characterize the coke reactivity and proceed with appreciable endoeffect ( ∆ H = 189.1 kJ/mol). CO 2 conversion above 50 % is achieved at the temperatures higher than 1073 K [19][20][21][22][23]. That is why we observe the decrease of DTA curve at the temperatures higher than 1213-1233 K (Fig.…”

Properties of coal tar characterized by slight pyrolysis

“…In the works [1,2], an organic coal substance is represented as a collection of packets of condensed aromatic nucleus with side non-aromatic groups including oxygen, nitrogen, sulfur and other heteroatoms that chemically bind the neighboring packets to the spatial polymer. This view suggested that in the course of carbonization in lateral radicals, the carbon-oxygen bonds are replaced by carbon-carbon bonds [3].…”