本研究以低成本流体催化裂化(FCC)油浆和废液沥青质(WFA)为原料,通过共碳化法合成中间相沥青。全面分析了所得中间相沥青产物及其形成机理。各种表征技术,包括偏光显微镜,软化点测量,傅里叶变换红外光谱(FTIR),和热重分析(TGA),对中间相沥青的性质和结构进行了表征和分析。实验结果表明,在特定的反应条件下,中间相产物具有最佳的光学结构,包括420°C的温度,1MPa的压力,反应时间6h,加入2%的沥青质。观察到少量的沥青质有助于中间相沥青球的形成,促进中间相的发展。然而,过量的沥青质可能覆盖中间相球的表面,阻碍它们之间的接触,并因此损害中间相沥青产品的光学纹理。此外,沥青质的掺入促进了系统中的聚合反应,导致中间相沥青的平均分子量增加。值得注意的是,当沥青质的添加量为2%时,中间相间距显示出最低的ID/IG值,表明优越的分子取向和较大的类石墨微晶。此外,研究人员发现,在这种沥青质浓度下,中间相间距表现出最高的有序度,如最大衍射角(2θ)和堆叠高度(Lc)值所示,和最小d002值。此外,沥青质的加入提高了中间相沥青的产率和芳香性,并显著提高了所得产物的热稳定性。
This study investigates the synthesis of mesophase pitch using low-cost fluid catalytic cracking (FCC) slurry and waste fluid
asphaltene (WFA) as raw materials through the co-carbonization method. The resulting mesophase pitch product and its formation mechanism were thoroughly analyzed. Various characterization techniques, including polarizing microscopy, softening point measurement, Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA), were employed to characterize and analyze the properties and structure of the mesophase pitch. The experimental results demonstrate that the optimal optical texture of the mesophase product is achieved under specific reaction conditions, including a temperature of 420 °C, pressure of 1 MPa, reaction time of 6 h, and the addition of 2% asphaltene. It was observed that a small amount of
asphaltene contributes to the formation of mesophase pitch spheres, facilitating the development of the mesophase. However, excessive content of
asphaltene may cover the surface of the mesophase spheres, impeding the contact between them and consequently compromising the optical texture of the mesophase pitch product. Furthermore, the inclusion of
asphaltene promotes polymerization reactions in the system, leading to an increase in the average molecular weight of the mesophase pitch. Notably, when the amount of
asphaltene added is 2%, the mesophase pitch demonstrates the lowest ID/IG value, indicating superior molecular orientation and larger graphite-like microcrystals. Additionally, researchers found that at this asphaltene concentration, the mesophase pitch exhibits the highest degree of order, as evidenced by the maximum diffraction angle (2θ) and stacking height (Lc) values, and the minimum d002 value. Moreover, the addition of asphaltene enhances the yield and aromaticity of the mesophase pitch and significantly improves the thermal stability of the resulting product.