Removal of Ash Content from Indian Coal by Using Solvents
نویسنده
چکیده
Coal is most important fossil fuel in world. Energy requirement of world is increasing in many fields day by day. The crude oil and coal are the main backbone of energy. Since the reserves of crude oil are decreasing day by day as a result the coal becomes the main sources of fossil fuel. Ash content of Indian coal is very high ranging from 15% to 55% [1]. Ash is an inorganic compound present into the coal defined as a mass of incombustible material remaining after complete combustion of coal as a percentage of the original mass of the coal. It is mainly due to the presence of silicon-di-oxide, Aluminium oxide, Ferric oxide and Calcium oxide. In this paper, the different experiments have been done using different solvents such as N-Methyl-2-Pyrrolidone (NMP), Furfural, Aniline, Acetic Acid and Toluene with different concentration. Comparative study of different solvents show NMP is the best solvent or extractant with respect to the removal of ash content from coal. The maximum reduction of ash content of coal is 72 % at 120C and 1 atmospheric pressure in presence of NMP as an extractant which has high chemical and thermal stability. NMP is recyclable and biodegradable and it is not a hazardous chemical. 65% of NMP was recovered by thermal distillation at 202C-206C and then using hot air oven remaining part of NMP was removed from mixture of NMP and coal dust.
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