Visualization study of the effects of polycarboxylates on CO2 hydrate generation and interfacial property.

IF 8.2 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Science of the Total Environment Pub Date : 2025-01-01 Epub Date: 2024-12-20 DOI:10.1016/j.scitotenv.2024.178155
Jingru Zhang, Yi Zhang, Guangjun Gong, Wanting Liu, Yuechao Zhao, Yongchen Song
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引用次数: 0

Abstract

Marine carbon sequestration, with its high potential and low risk of leakage, is an attractive technology for effectively addressing global climate change and reducing greenhouse gas emissions. A current concern about marine sequestration lies in the potential negative effects of the carbon sequestration process on the marine environment. CO2 hydrate sequestration is considered to be one of the most stable method of sequestration, and researchers are actively searching for promoters that facilitate hydrate sequestration and are friendly to the marine environment. Therefore, the development and utilization of environment-friendly promoters are of great significance for marine carbon sequestration by the hydrate method. In this study, two novel kinetic promoters, polycarboxylates (SP-409 and SPC-100), were applied. The changes in kinetic properties of CO2 hydrate generation and gas-liquid interfacial properties were investigated under different promoter types and concentrations, temperatures, and pressures. Visual observation reveals that the formation of hydrate first occurs at the gas-liquid interface and on the reactor wall, then gradually starts to diffuse into the interior of the solution, forming a white cylindrical solid with a hollow interior. After a comprehensive comparison of temperatures, pressures, and concentrations, the SP-409 solution promoted hydrate generation better than the SPC-100 solution, and the optimal promotion concentration was 1000 ppm. In addition, there is an exponential relationship between the rate of hydrate formation and interfacial tension (IFT), which means that the rate of hydrate generation can be quickly estimated from the interfacial tension data at a certain temperature and pressure.

聚羧酸酯对CO2水合物生成及界面性质影响的可视化研究。
海洋固碳技术具有潜力大、泄漏风险低的特点,是有效应对全球气候变化和减少温室气体排放的一项有吸引力的技术。目前对海洋碳封存的关注在于碳封存过程对海洋环境的潜在负面影响。CO2水合物固存被认为是最稳定的固存方式之一,研究人员正在积极寻找有利于水合物固存且对海洋环境友好的促进剂。因此,开发和利用环境友好型促进剂对海洋水合固碳具有重要意义。在本研究中,两种新的动力学启动剂,聚羧酸酯(SP-409和sp -100)的应用。研究了不同促进剂类型、浓度、温度和压力对CO2水合物生成动力学性质和气液界面性质的影响。目视观察发现,水合物的形成首先发生在气液界面和反应器壁上,然后逐渐开始向溶液内部扩散,形成内部中空的白色圆柱形固体。通过对温度、压力和浓度的综合比较,SP-409溶液比SPC-100溶液更能促进水合物的生成,最佳促进浓度为1000 ppm。此外,水合物的生成速率与界面张力(IFT)之间存在指数关系,这意味着可以从一定温度和压力下的界面张力数据快速估计水合物的生成速率。
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来源期刊
Science of the Total Environment
Science of the Total Environment 环境科学-环境科学
CiteScore
17.60
自引率
10.20%
发文量
8726
审稿时长
2.4 months
期刊介绍: The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.
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