Experimental research on mercury removal by modified petroleum coke with SO2 activation

doi:10.16085/j.issn.1000-6613.2017-0834

Abstract

Abstract: Three different crude high sulfur petroleum cokes were activated with SO₂ to prepare samples of the petroleum coke with high sulfur content. The physical and chemical properties of the samples were characterized using surface area and porosity analyzer, X-ray photoelectron spectroscopy and ultimate analysis. Experimental studies on mercury removal were investigated in a fixed bed reactor system. The results showed that the process of modification of petroleum coke with SO₂ effectively loaded sulfur on the surface. A large amount of organic sulfur(thiophene) was detected on the surface of the high-sulfur-content petroleum coke, which indicated its great ability of mercury removal. The sulfur content and sulfur formd on the surface of petroleum coke with high sulfur content have a great influence on the mercury removal capacity. The microstructure and micro morphology on surface of the petroleum coke played a remarkable role on mercury removal ability. The Hg⁰ penetration rate decreased and the mercury removal ability of high-sulfur-content petroleum coke increased with reduction of adsorption temperature in a certain range.

Key words: sulfur dioxide, high sulfur petroleum coke, fixed-bed, mercury removal, microstructure, adsorption temperature

摘要： 以SO₂为活性气体对3种不同的原始高硫石油焦进行活化形成高硫石油焦样品。采用比表面积及孔隙度分析仪、X射线光电子能谱分析和元素分析等仪器和方法研究样品的物理化学性质，在固定床实验装置上对样品的脱汞能力进行实验研究。结果表明，用SO₂气体改性石油焦的过程是一个有效的载硫过程；经过SO₂改性后的高硫石油焦表面负载有大量有机硫（噻吩），具有较强的脱汞能力；高硫石油焦表面的含硫量和硫形态对其吸附脱汞能力有很大影响，高硫石油焦表面的微孔结构和微观形貌也在一定程度上影响其脱汞能力；在一定温度范围内随着吸附温度的降低，改性高硫石油焦的Hg⁰穿透率呈下降趋势，即汞脱除性能不断增强。

关键词: 二氧化硫, 高硫石油焦, 固定床, 脱汞, 微观结构, 吸附温度

CLC Number:

X511

LI Jiachen, YIN Qi, WANG Chenping, CHEN Mingming, DAI Ling, ZHANG Yun, DUAN Yufeng. Experimental research on mercury removal by modified petroleum coke with SO₂ activation[J]. Chemical Industry and Engineering Progress, 2018, 37(02): 540-545.

李佳辰, 殷琦, 王晨平, 陈明明, 戴领, 张赟, 段钰锋. SO₂改性高硫石油焦脱汞实验研究[J]. 化工进展, 2018, 37(02): 540-545.

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Experimental research on mercury removal by modified petroleum coke with SO₂ activation

SO₂改性高硫石油焦脱汞实验研究

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