Effects of Hydrocarbon Addition on Increase in Dilatation of Coal

Abstract

The addition of coal tar pitch mainly composed of polycyclic aromatic hydrocarbons (PAHs), increases the dilatation of coal. We investigated the effect of PAHs on the maximum dilatation (MD) of hard coking coals and semi-soft coking coals. Twenty-six kinds of PAHs and aliphatic hydrocarbon were used as additive agents. The use of a PAH with a molecular weight in the range 152.19-178.23 as an additive agent almost unchanged the MD. When a PAH with a molecular weight in the range 178.23-378.47 was added to the coal, the MD of the coal increased. The increase in MD achieved with the addition of 9,10-dihydrophenanthrene was larger than that obtained with the addition of phenanthrene. This is likely because the hydrogen atoms in the ninth and tenth positions in 9,10-dihydrophenanthrene inhibit the polymerization of the coal structure. The MD was hardly affected by the addition of a linear aliphatic hydrocarbon (C 28 H 58) but MD decreased due to the addition of anthraquinone with carbonyl carbon. When a PAH with nonplanar structure was added to the coal, the increase in MD was smaller than when a PAH with planar structure was added.

Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

“…The use of air catalytic oxidation CTP significantly reduces the emission of PAHs during the co-carbonization process, which is of great meaningful results for environmental pollution prevention and control of the coking industry. From Table 7, the proportion of PAHs with a molecular mass between 178 and 278 in CTP is increased after air oxidation, which is beneficial to enhance the coal expansion rate to fill the void between coal particles, thereby increasing the contact between them and reducing the escape of gas during the carbonization process [56]. The PAHs produced by co-carbonization are mainly four-ring aromatic hydrocarbons, shown in Figure 8 [34,35].…”

Influence of Technological Parameters on the Composition and Properties of Petroleum Coke

“…However, the significant problem posed by the disposal of the pulverized coke left over from the "fluid" process must be addressed. With over 50 Lummus units and more than I НЕФТЕХИМИЯ 85 Fost Wheeler units already operational in the United States [13][14][15][16], the Lummus and Fost Wheeler versions of slow coking units are currently in high demand. This represents a significant advancement in the industry's efforts to maximize the production of coke from oil reserves.…”