Research On Mechanism Of Removing Organic Sulfur In Coal By 1-phrpyl Alcohol

The effects of coal particle size, coal tar density, extract time and extract temperature on the removing ratio of organic sulphur in 1-phrpyl alcohol for 1:4 nitric acid pretreatment coal have been studied. The results are shown that this method is effective, and reaction condition is very mild. The optimized desulfurization conditions are follow as: the size of coal is 0.12mm, the concentration of coal is 0.083g/ml, reaction time is 90min and reaction temperature is 87℃. Under these conditions, the highest removal ratio of organic sulfur reaches to 52.29%.The orthogonal experiment results are shown that the influence factor degree on the removing ratio of organic sulphur is, coal granularity > reaction time > reaction temperature > concentration of coal.The components and characteristics of the desulfurization solution of 1-propyl alcohol have determined by the methods of infrared(IR) spectrumt, liquid chromatography-mass spectrum (LC-MS) and the gas chromatography-mass spectrum (GC-MS). The forms of organic sulphur in solution are mainly 2-Aminothiophenol, 4-Methyldibenzothiophene, 2-Mercaptobenzothiazole and the ethyl phenyl sulfide. The results of figures show that 1-phrpyl alcohol can extract a few compounds contained-nitrogen .Through analysing desulphurization rule and various structures of sulphur , the organic sulphur in the coal is eliminated mainly by the physical extraction. The desulphurization mechanism of 1-phrpyl alcohol may be as follows:①Because the organic sulphur is easily dissolved in the 1-phrpyl alcohol, organic sulphur can be removed through the seepage and the extract function.②The complex compound between carbon atom with positive electricity in 1-phrpyl alcohol and oxygen atom or the sulfur with negative electricity in coal molecule could be easily formed.③the mellow hydroxy bond in 1-phrpyl alcohol can destroy the organic sulphur structure of coal.