高硫石油焦煅烧脱硫研究

Study on Desulfurization of High-sulfur Petroleum Coke by Calcination Process

采用碳酸钠高温煅烧法,研究了煅烧温度、碳酸钠添加量和煅烧时间对高硫石油焦煅烧脱硫效果的影响,利用SEM、FT-IR和XRD等表征手段,对石油焦脱硫前后的微观形貌、化学结构和微晶结构进行比较分析。结果表明,在煅烧温度1 300℃、碳酸钠添加量25%和煅烧时间70min的条件下,脱硫率可达69.73%;脱硫后石油焦表面变得疏松,断层结构增多,S元素含量减少;脱硫后(002)衍射峰更加尖锐,结晶度提高;煅后焦在478、744和863cm^-1处的特征吸收峰明显减弱,脱硫效果良好。

Effects of calcination temperature,amount of sodium carbonate and calcination time on desulfurization rate were studied through high-temperature calcination of Na2CO3.SEM,FT-IR and XRD were combined to analyze micromorphology,chemical structure and microcrystalline structure.The results show that desulfurization rate is 69.73%under the conditions including calcination temperature of 1 300℃,amount of Na2CO3 of 25%and calcination time of 70min.After desulfurization,petroleum coke turns to be loose,fault structure rises,and content of sulfur element drops.(002)diffraction peak is more acute and crystallinity is improved.The characteristic absorption peak at 478,744 and 863cm-1 is significantly reduced,and desulfurization effect is good.