高硫石油焦微波煅烧脱硫

Desulfurization of High-Sulfur Petroleum Coke by Microwave Calcination

采用微波辐照煅烧方法,研究了Na_(2)CO_(3)添加量和反应时间对高硫石油焦脱硫效果的影响,并与常规马弗炉煅烧方法相比较,采用扫描电镜(SEM)、BET氮吸附、X射线衍射(XRD)和傅里叶红外光谱(FT-IR)等表征手段,对石油焦煅烧脱硫前后的表面微观形貌、比表面积、孔体积、微晶结构和化学结构进行比较分析。结果表明:当微波功率为700 W、微波加热时间为30 min、Na_(2)CO_(3)添加质量分数为25%时,石油焦脱硫率可达73.95%,硫醇类和大部分噻吩类有机硫得到有效脱除,可促进石油焦碳结构的有序度提高和石墨微晶单元的生长。与马弗炉煅烧相比,微波煅烧仅需更低的温度,更短的时间,即可取得更好的脱硫效果;微波煅烧使石油焦表面变得更加疏松,可显著提高石油焦的比表面积和孔体积。

The effects of Na_(2)CO_(3)addition and reaction time on desulfurization of high-sulfur petroleum coke were studied by the microwave irradiation calcination method.Compared with conventional muffle furnace calcination,the surface micro-morphology,specific surface area,pore volume,microcrystalline structure and chemical structure of petroleum coke before and after desulfurization were analyzed by means of scanning electron microscope(SEM),BET nitrogen adsorption,X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).The results show that the desulfurization rate of petroleum coke reaches 73.95%under the conditions of microwave power being 700 W,microwave heating time being 30 min and Na_(2)CO_(3)mass fraction being 25%.Moreover,it is shown that mercaptans and most thiophene organic sulfur have been effectively removed,and microwave calcination promotes the order of petroleum coke structure and the growth of graphite crystallite units.Compared with conventional calcination,microwave calcination needs lower temperature and shorter time to obtain better desulfurization effects.Microwave calcination makes the surface of petroleum coke looser,which significantly improves the specific surface area and pore volume of petroleum coke.