Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen.
Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen.
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DOI：
10.1016/j.ultsonch.2021.105811
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发表时间：
2021-12
影响因子：
8.4
通讯作者：
Okawa H
中科院分区：
文献类型：
--
作者：
Nguele R;Okawa H
研究了沥青质凝聚对沥青粘度的贡献。超声波可以降低沥青的粘度。使用频率和气体环境对沥青降粘效果有影响。沥青质产率与粘度呈正相关。本文研究了超声波辐照下沥青质聚集对沥青粘度的贡献。在常温下粘度为12043 kHp的西非沥青，在空气、氮气和二氧化碳等受控气体环境下，用低频(38 KHz)和中频(200 KHz)进行超声波处理。进行了沥青的流变性、沥青质含量分析和光谱分析。在此发现，在空气环境下以200 kHz的频率对沥青进行超声波处理，可使沥青的初始粘度降低到2079 kHp，比使用低频时的初始粘度高出一倍。在气体环境方面，研究表明，在氮气环境下，超声波辐射可以使沥青粘度降低到3274cp。沥青质含量与降粘效果呈正相关。快速傅立叶红外光谱分析和扫描电子显微镜的观察结果与流变学的研究结果一致，认为粘度降低是由于芳环上长链分子的断裂(在固定的气体环境下改变作用频率)或沥青质单体的自聚集(当气体环境以固定的频率改变时)。
The contribution of asphaltene aggregation to bitumen viscosity is studied. The ultrasound waves reduce the viscosity of the bitumen. The applied frequency and the gas environment influence the bitumen viscosity reduction. A positive correlation between the asphaltene yield and the viscosity is established. The present work investigates the contribution of asphaltene aggregation to bitumen viscosity subject to ultrasound irradiation. A West-African bitumen with a viscosity of 12043 cP at room temperature was sonicated at low (38 kHz) and mild frequency (200 kHz) under controlled gas environment including air, nitrogen (N2) and carbon dioxide (CO2). The rheology of the bitumen, asphaltene content analyses as well as spectral studies were conducted. Herein was found that sonicating the bitumen at 200 kHz under air-environment reduces the initial viscosity up to 2079 cP, which was twice larger than that obtained when a low frequency was used. In respect of the gas environment, it was shown that ultrasound irradiation under N2 environment could lower the bitumen viscosity up to 3274 cP. A positive correlation between the asphaltene content and the viscosity reduction was established. The results from the spectral analyses including Fast Fourier Infrared and the observations from Scanned Electron Microscope were consistent with the rheological studies and led to the argument that the viscosity reduction results from either the scission of long chain molecules attached to the aromatic rings (when the applied frequency was altered under fixed gas environment) or the self-aggregation of asphaltene monomers (when gas environment was changed at fixed frequency).
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