大同煤温和超临界热溶-炭化耦合转化过程研究

为了实现低阶煤的分级提质高效综合利用,以大同煤为原料,利用温和超临界热溶-炭化耦合技术对其处理,获得热溶油和高比表面积活性炭材料,采用SEM、XRD、FT-IR对活性炭进行表征,并评价其对亚甲基蓝的吸附性能。结果表明,煤的热溶率达到26. 23%,热溶残渣炭材料和大同煤炭材料的收率分别为45. 95%和46. 87%;热溶残渣炭材料最高吸附量达到1 340 mg/g,对亚甲基蓝的脱除率达到95. 7%;而大同煤炭材料最大吸附量仅为1 040 mg/g,对亚甲基蓝的脱除率为74. 3%。说明通过温和超临界热溶-炭化耦合技术不仅可得到一定数量的热溶油,热溶残渣还可在中低温条件下制备高比表面积活性炭材料,该材料对亚甲基蓝的吸附性能优于普通活性炭。 Abstract:In order to achieve the high efficient and upgrading utilization of low-rank coal,the thermal extraction oil and high specific surface area activated carbon were prepared by mild supercritical thermal extraction coupled with carbonization technology using Datong coal.The activated carbon were analyzed by scanning electron microscope (SEM),X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR).The adsorption properties were tested by methylene blue.The results show that thermal extraction rate of coal reaches 26.23%,and carbon material yield of thermal extraction residue and Datong coal are 45.95% and 46.87% respectively.The maximum adsorption amount of thermal extraction residue based carbon material reaches 1 340 mg/g,and the removal rate of methylene blue reaches 95.7%,while,maximum adsorption amount of Datong raw coal based carbon material is only 1 040 mg/g,and the removal rate of methylene blue is 74.3%.It is found that Datong coal not only produces a certain number of thermal extraction oil,but the thermal extraction residue is also converted into high specific surface area activated carbon under the condition of mild-low-temperature activation.The adsorption properties of the activated carbon on methylene blue are better than common active carbon