| 醋酸钾对轻石脑油裂解结焦的影响 |
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| 引用本文： | 栾小建,徐宏,王志远,周建新,曲瑞波. 醋酸钾对轻石脑油裂解结焦的影响[J]. 化工学报, 2011, 62(12): 3405-3410. DOI: 10.3969/j.issn.0438-1157.2011.12.015 |
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| 作者姓名： | 栾小建 徐宏 王志远 周建新 曲瑞波 |
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| 作者单位： | 1.化学工程联合国家重点实验室，华东理工大学机械与动力工程学院，上海 200237； 2南京工业大学机械与动力工程学院，江苏 南京 210009 |
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| 基金项目： | 上海市曙光跟踪计划项目~~ |
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| 摘 要： | 为考察碱金属元素对裂解结焦的影响，以醋酸钾为结焦抑制剂，在850℃下对退役25Cr35Ni炉管试样内表面进行了结焦实验。利用扫描电子显微镜(SEM)、场发射扫描电镜(FE-SEM)、能量色散谱仪(EDS）、X射线衍射(XRD)和Raman光谱对退役25Cr35Ni炉管试样内表面和焦层进行了表征。结果表明，退役25Cr35Ni炉管内表面主要由Cr1.3Fe0.7O3关 键 词： | 退役25Cr35Ni炉管 裂解 石脑油 醋酸钾 结焦 |
Influence of potassium acetate on coke formation during cracking of light naphtha |
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| LUAN Xiaojian,XU Hong,WANG Zhiyuan,ZHOU Jianxin,QU Ruibo. Influence of potassium acetate on coke formation during cracking of light naphtha[J]. Journal of Chemical Industry and Engineering(China), 2011, 62(12): 3405-3410. DOI: 10.3969/j.issn.0438-1157.2011.12.015 |
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| Authors: | LUAN Xiaojian XU Hong WANG Zhiyuan ZHOU Jianxin QU Ruibo |
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| Affiliation: | LUAN Xiaojian1,XU Hong1,WANG Zhiyuan1,ZHOU Jianxin1,2,QU Ruibo1(1State Key Laboratory of Chemical Engineering,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China,2School of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,Jiangsu,China) |
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| Abstract: | To study the influence of alkali metal on coke formation, a coking test was carried out on the inner surface of a used 25Cr35Ni cracking tube at 850℃ using potassium acetate as coking inhibitor.Its inner surface and cokes deposited in the coking tests were characterized by scanning electron microscopy(SEM), field-emission scanning electron microscopy(FE-SEM), X-ray energy dispersion spectrometry(EDS), X-ray diffraction(XRD）and Raman spectroscopy.The results showed that the inner surface of the used 25Cr35Ni cracking tube was mainly composed of Cr1.3Fe0.7O3，FeCr2O4，Mn1.5Cr1.5O4, the intermetallic compound (Fe and Ni）and the needle-like deposition phase (intermetallic compound of Cr and Fe).Potassium acetate could inhibit coke formation effectively.When its concentration was 200 μg·g-1, deposition of coke was reduced by 51.54% in 1h.Potassium acetate did not change the length of coke filament, but it made filament diameter into nanometer level.The mechanism of inhibiting coking by potassium acetate was that gasification reaction between coke and water was catalyzed by alkali metal.The carbon in cokes deposited on the inner surface was of sp2 and sp3 bonds structure.Potassium acetate increased also graphitization degree of coke deposited. |
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| Keywords: | 25Cr35Ni cracking tube after service cracking naphtha potassium acetate coking |
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