A system and a process to produce low ash clean coal from high ash coal

Disclosed herein is an industrial process for treating coal to lower ash content in a system, the system comprising a first water storage tank (1), a second water storage tank (2), a diesel storage tank (3), a thermic fluid heater (4), a thermic fluid storage tank (5), a thermic fluid pump (6), a heat exchanger (7), a thermic fluid expansion tank (8), a N2 gas cylinder (9), a reactor (10), a water pump (11), and a reflux condenser (12), the method comprising (i) forming a slurry of coal fines in N-Methyl-2-pyrrolidone (NMP) and Ethylenediamine (EDA) solvents, the NMP and EDA ratio varying between 5:1 to 25:1 solution, said slurry containing about 6 to 18 ml of solution per g of coal, (ii) maintaining said slurry in the reactor at a temperature range of 150°C to 220°C and at a pressure range of 1 to 4 gauge (kg/cm ) for a period of about 1 to 3 hours, (iii) separating a sample of the slurry by coarse filtration in a filter cloth, (separation cut size being variable depending on the particle size to be treated and the end produce), to obtain a filtrate or extract and a residue, (iv) precipitating the coal in water by adding concentrated extract, and (v) separating the coal by filtration, said coal having a reduced ash content of less than 8%.