{"title":"沥青质在模拟石油系统中聚集的起始点和动力学:用动态光散射和超微显微镜研究","authors":"V. N. Kuryakov","doi":"10.1134/S0965544125601024","DOIUrl":null,"url":null,"abstract":"<p>This paper reports on the determination of a stability threshold for an 0.1 g/L asphaltene solution in toluene with the addition of heptane as a precipitant. For this purpose, ultramicroscopy as well as dynamic and static light scattering methods were employed. Ultramicroscopy has never previously been used to determine stability thresholds in petroleum systems. Using the abovementioned experimental methods, an asphaltene aggregation onset point was identified for the tested asphaltene solution, and a time-dependent trend in mean aggregate size was revealed once the stability threshold was exceeded. The study results show that ultramicroscopy enables rapid onset point determination in model petroleum systems of this type and provides higher sensitivity than dynamic or static light scattering; specifically, it can detect lower concentrations of asphaltene aggregates. A single, bulk addition of heptane above the onset point resulted in diffusion-limited aggregation. In contrast, gradual titration past the stability threshold led to a slower process in which the mean aggregate size increased linearly with time.</p>","PeriodicalId":725,"journal":{"name":"Petroleum Chemistry","volume":"65 6","pages":"654 - 658"},"PeriodicalIF":1.1000,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Onset Points and Kinetics of Asphaltene Aggregation in Model Petroleum Systems: Investigation Using Dynamic Light Scattering and Ultramicroscopy\",\"authors\":\"V. N. Kuryakov\",\"doi\":\"10.1134/S0965544125601024\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This paper reports on the determination of a stability threshold for an 0.1 g/L asphaltene solution in toluene with the addition of heptane as a precipitant. For this purpose, ultramicroscopy as well as dynamic and static light scattering methods were employed. Ultramicroscopy has never previously been used to determine stability thresholds in petroleum systems. Using the abovementioned experimental methods, an asphaltene aggregation onset point was identified for the tested asphaltene solution, and a time-dependent trend in mean aggregate size was revealed once the stability threshold was exceeded. The study results show that ultramicroscopy enables rapid onset point determination in model petroleum systems of this type and provides higher sensitivity than dynamic or static light scattering; specifically, it can detect lower concentrations of asphaltene aggregates. A single, bulk addition of heptane above the onset point resulted in diffusion-limited aggregation. In contrast, gradual titration past the stability threshold led to a slower process in which the mean aggregate size increased linearly with time.</p>\",\"PeriodicalId\":725,\"journal\":{\"name\":\"Petroleum Chemistry\",\"volume\":\"65 6\",\"pages\":\"654 - 658\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2025-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Petroleum Chemistry\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0965544125601024\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, ORGANIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Petroleum Chemistry","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0965544125601024","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ORGANIC","Score":null,"Total":0}
Onset Points and Kinetics of Asphaltene Aggregation in Model Petroleum Systems: Investigation Using Dynamic Light Scattering and Ultramicroscopy
This paper reports on the determination of a stability threshold for an 0.1 g/L asphaltene solution in toluene with the addition of heptane as a precipitant. For this purpose, ultramicroscopy as well as dynamic and static light scattering methods were employed. Ultramicroscopy has never previously been used to determine stability thresholds in petroleum systems. Using the abovementioned experimental methods, an asphaltene aggregation onset point was identified for the tested asphaltene solution, and a time-dependent trend in mean aggregate size was revealed once the stability threshold was exceeded. The study results show that ultramicroscopy enables rapid onset point determination in model petroleum systems of this type and provides higher sensitivity than dynamic or static light scattering; specifically, it can detect lower concentrations of asphaltene aggregates. A single, bulk addition of heptane above the onset point resulted in diffusion-limited aggregation. In contrast, gradual titration past the stability threshold led to a slower process in which the mean aggregate size increased linearly with time.
期刊介绍:
Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas.
Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.