溶剂萃取法从轻循环油生产高价值芳烃的工艺,Energy & Fuels

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溶剂萃取法从轻循环油生产高价值芳烃的工艺
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-08-23 , DOI: 10.1021/acs.energyfuels.3c02048
Kirtika Kohli _{1,

2} , Prasenjit Ghosh ₁ , Vedant A. Joshi ₃ , Pooja Yadav ₁ , Deependra Tripathi ₄ , Raghuvir Singh ₄ , Samir K. Maity _{2,

5} , Manoj Srivastava _{1,

2}

Affiliation

轻循环油 (LCO) 是典型炼油厂流化催化裂化装置 (FCC) 的低质量且难以销售的副产品，含有有价值的芳香族成分。目前的工作研究了使用硝基甲烷、 n-甲酰吗啉、二甲基甲酰胺、二甲亚砜和n-甲基-2-吡咯烷酮等溶剂从LCO中萃取双芳香族成分。实验结果表明，二甲亚砜在较高的芳烃分配系数和双芳烃回收率方面表现出较好的效果。由于其与传统溶剂（例如n ）相比具有更好的性能和更低的毒性-甲基-2-吡咯烷酮、二甲基亚砜是溶剂萃取过程的理想选择。此外，还利用炼油厂获得的二甲亚砜溶剂和轻循环油原料进行了萃取参数优化（改变溶剂与原料的比例和萃取温度）。使用不同的技术对萃余液和萃取产物进行表征，例如傅里叶变换红外光谱、¹ H 和¹³13C 核磁共振和气相色谱质谱 (GC-MS) 用于详细的碳氢化合物成分分析。提取物烃的GC-MS表征结果显示存在萘衍生物（主要是1-甲基萘和2,6-二甲基萘）。因此，萃取实验后获得的富含芳香族化合物的萃取产物可以进一步用作烃工业中原料流的有价值的前体。

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Process for Producing High-Value Aromatics from Light Cycle Oil Using a Solvent Extraction Method

Light cycle oil (LCO) is a low-quality and poorly marketable byproduct of a fluidized catalytic cracker (FCC) in a typical petroleum refinery and contains valuable aromatic components. The present work investigates the extraction of diaromatic components from LCO using solvents such as nitromethane, n-formyl morpholine, dimethylformamide, dimethyl sulfoxide, and n-methyl-2-pyrrolidone. The experimental work indicated that dimethyl sulfoxide showed better results in terms of a high aromatic distribution coefficient and diaromatic recovery value. Because of its better performance and lesser toxicity compared to conventional solvents such as n-methyl-2-pyrrolidone, dimethyl sulfoxide is an ideal candidate for the solvent extraction process. Further, extraction parameter optimization (varying the solvent-to-feedstock ratio and extraction temperature) was also performed with the dimethyl sulfoxide solvent and light cycle oil feedstock obtained from a refinery. The raffinate and extract products were characterized using different techniques such as Fourier-transform infrared spectroscopy, ¹H and ¹³C nuclear magnetic resonance, and gas chromatography mass spectrometry (GC-MS) for detailed hydrocarbon compositional analysis. The GC-MS characterization results of the extract hydrocarbons showed the presence of naphthalene derivatives (mainly 1-methylnaphthalene and 2,6-dimethylnaphthalene). Therefore, the aromatic rich extract product obtained after the extraction experiments can be further used as a valuable precursor to the feed stream in the hydrocarbon industry.

更新日期：2023-08-23

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