DISTRIBUTION OF SULPHUR FUNCTIONAL GROUPS IN HIGH SULPHUR BAPUNG COALS OF ASSAM

摘要

Studies for determination of sulphur functional groups present in Bapung coal of Assam State of North EasternrnRegion of India were carried out using Temperature Programmed Reduction (TPR) method. TPR studies wererncarried out in presence of Resorcinol and hydrogen gas to arrive at the final result. TPR studies on model sulphurrncompounds viz. L-Cysteine, synthetic rubber, Thiokol, having hydroxyl terminal groups, thioplast, pyrite with sand,rnand Garlic were carried out in order to assign various sulphur functional groups present in Bapung coal. Six numbersrnof hydrogen sulphide evolutions from Bapung coal were observed in the temperature range of 190 – 220℃, 260 –rn290℃, 360 - 390℃, 460 – 490℃, 510 – 5400℃ and 590 – 620℃ corresponding to mercaptan/ disulphide (0.20),rnThiol (1.20), AromaticThioether (0.50), Thiophene (0.40), pyrite + part of complex thiophene (1.10), part ofrncomplex thiophene (0.30), The thioketonic sulphur in Bapung coal is estimated to be 0.30using controlled nitric acidrnoxidation experiments.