关键词: 减压渣油, 调和沥青, 老化动力学, 平均分子结构

Abstract: There are technical bottlenecks in producing qualified road asphalt using Tahe vacuum residue oil (THVR). In present work, THVR, used as a matrix asphalt, was blended with Chunfeng vacuum residue oil (CFVR) as an added component which was selected from 3 different kinds of blending components including FCC slurry oil, furfural extract oil and CFVR. The preparation of 60^# road asphalt based on THVR was investigated; thermal aging kinetics model of the resulting asphalt was established based on the contents of insoluble asphalt component in heptane; and the average molecular structures of four components contained in asphalt before and after modification were characterized. The results showed that the thermal aging and low temperature performance of CFVR was better while temperature sensitivity was worse compared with THVR, and blending asphalt TH-CF-40 containing 40% CFVR could meet the standard of 60^# Road Petroleum Asphalt. Compared to THVR, TH-CF-40 had the lower aging rate and higher activation energy of aging reaction of 102.00 kJ/mol. Average chain length L of the saturate was 14.44, which was shorter than THVR. The aromatic carbon rates f_Aof aromatic, resin and asphaltene were 0.29, 0.42 and 0.46, respectively. The ratios of aromatic ring to naphthenic ring R_A/R_N were 1.24, 2.65 and 2.93; and the average chain lengths L were 6.78, 6.09 and 5.40. The results indicated that the molecular structure was close to CFVR, therefore, leading to the improved anti-aging performance and low-temperature ductility of blending asphalt. Such processing technology can help reduce the throughput of THVR involved in coking process. Furthermore, the research results can improve the utilization level of THVR and provide theoretical guidance for expanding the efficient use of CFVR, as a result, indicating academic significance and application foreground.

Key words: vacuum residue, blending asphalt, aging kinetics, average molecular structure