High Olefin Yield in Pyrolysis of Heavier Hydrocarbon Liquids Using Microwave as Heat Supplier

详细信息    查看全文

• 作者：Xiaodong JingYuehong Zhao ; Hao Wen ; Zhihong Xu
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：2052-2062
• 全文大小：454K
• ISSN：1520-5029

文摘

In order to expand the scope of C₂H₄ pyrolysis material and recycle the waste polyolefin, this study has employed microwave pyrolysis of heavier hydrocarbon liquids. Microwave pyrolysis not only maintains a stable energy supply to the reaction materials for obtaining a high conversion rate, but also avoids coking caused by local overheating. Steam may serve a dual role as diluent and heat carrier. Thus, this study has obtained higher olefin yield, higher olefin selectivity, and better operational continuity than conventional steam cracking. Light olefins (C₂^═–C₄^═) reached 50.65–68.64 mol% in the pyrolysis gas. The yields of C₂H₄ and C₃H₆ for heavier hydrocarbons pyrolysis were 42.80–44.76 and 12.98–13.91 wt% of the feedstock, respectively, while the maximum yields of C₂H₄ and C₃H₆ for pyrolysis of liquid products of polyolefin cracking were 47.00 and 22.83 wt%, respectively. Analysis of the pyrolysis mechanism indicates that the β-scission reactions of free radicals are predominant, while the secondary reactions are significantly inhibited due to the enhanced heat transfer between the steam and the hydrocarbons.