Sulfur-containing coal

Sulfur dioxide is released during the burning of sulfur-containing coal. Much of that gas is now removed from the effluent and used in the production of sulfuric acid. The dioxides of Se and Te are recovered from the residue after the elements have reacted with concentrated HN03. 

Edwards, D.R. and Prausnitz, J.M. Vapor pressures of some sulfur-containing, coal-related compounds, / Chem. Eng. Data, 26(2) 121-124, 1981. 

The mechanisms by which acid rain forms and exerts its effects on the environment are now quite well understood. The primary culprit in this process is sulfur dioxide, produced when sulfur-containing coal is burned in power generating plants ... 

Acid Rain Acid rain, a second major environmental problem, results primarily from the production of sulfur dioxide, SC 2, that accompanies the burning of sulfur-containing coal in power-generating plants. Sulfur dioxide is slowly converted to SO3 by reaction with oxygen in air, and SO3 dissolves in rainwater to yield dilute sulfuric acid, H2SO4. 

Until recently, there have been only a few reports of aliphatic sulfur structures in coal (1,12). These results together with the experiments of Gorbaty et al. (11), give further support for the presence of labile (presumably aliphatic) sulfur moieties in high-organic sulfur-containing coals. In the previous sulfur study (1), one bituminous coal was analyzed for organic sulfur forms both by the... 

Figure 2.3 Illustration of the definition of environmental chemistry by the example of pollutant sulfuric acid formed by the oxidation of sulfur dioxide generated during the combustion of sulfur-containing coal. 

Large amounts of SO2 are produced by the burning of sulfur-containing coal. 

Sulfur dioxide is an atmospheric pollutant resulting from the burning of sulfur-containing coal. What is the geometry of sulfur dioxide, SO2 Is sulfur dioxide a polar or nonpolar molecule ... 

The major source of sulfur oxides in the atmosphere is the burning of sulfur-containing coal in power plants. As this type of coal burns in a furnace, sulfur dioxide gas, SO2, is produced. The SO2 escapes into the atmosphere, where it reacts with more oxygen to form sulfur trioxide, SO3. 

Sulfur dioxide is the most important gaseous stimulant in atmospheric corrosion. Combustion of sulfur-containing coal and oil and emission from metal, petrochemical, and pulp and paper industries are among the most important man-made sources. Based on the environment, Calvert and Stockwell [12] suggested several ways for SO2 to act as an oxidizer in the gas phase ... 

Instead of expensive metallin-gical coke or coal, a broad range of lower-cost bitiuninous coals and, optionally, additional minor amounts of low-cost petroleiun coke is used. High sulfur containing coals can be used because of the subsequent SO2 removal in the sulfuric acid plant. 

At present, most sulfur-containing coal is burned without prior treatment, and SOg is removed from the exhaust gases. In one method, lime (calcium oxide) reacts with SO2 to form calcium sulfite, a solid particulate, which can be removed from an exhaust stack by an electrostatic precipitator. Lime is prepared by heating limestone, which is mainly calcium carbonate. 

Sulfur occurs in coal as both organic (Chapter 10) and inorganic sulfur (Chapter 7) and the reactions of both forms of sulfur are quite important for coal combustion and conversion. During coal combustion, both of the sulfur forms appear as sulfur dioxide, which is the most significant pollutant from sulfur-containing coals. Thus, one of the major objectives of many coal conversion programs is to bring about the facile separation of sulfur from the combustible fraction of the coal. 

Atmospheric sulfur oxides (sulfur dioxide and sulfur trioxide) primarily come from the combustion of sulfur-containing coal [36]. Inhalation of sulfur dioxide rapidly causes the onset of bronchospastic effects after exposure [32]. 

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