Inhibition and co-condensation behaviour of 2-mercaptoethanol in top-of-line CO2 corrosion environments

IF 4.8 Q2 ENERGY & FUELS
Mariana C. Folena , Joshua Owen , Iain W. Manfield , Hanan Farhat , J.A.C. Ponciano , Richard Barker
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Abstract

Top of line corrosion (TLC) is a significant problem in oil and gas transportation pipelines, leading to both economic and production loss. Conventional organic corrosion inhibitors typically fail to provide effective protection for this particular type of corrosion. As such, the chemical inhibition of TLC relies on volatile compounds which can partition from the aqueous to the condensate formed at the top of the pipeline. Studies have shown that thiol compounds, through their high affinity for metallic surfaces, are providing effective inhibition in such environments, yet their inhibition mechanism and co-condensation characteristics are yet to be fully determined. This work studies the efficiency, adsorption mechanism and condensation behaviour of 2-mercaptoethanol (2-ME) as a volatile corrosion inhibitor in CO2-containing TLC environments through a novel direct assessment of condensate chemistry and real-time TLC measurements. Experimental analysis of condensate partitioning is performed through the implementation of a biochemical technique which targets sulphydryl groups, coupled with a miniature electrode configuration for real time, in-situ electrochemical TLC measurements. The proposed assay results in a rapid, cost-effective screening technique that can monitor thiol-based chemistries that condense in conjunction with the water phase. The new developed biochemical methodology identified that from 20 ppm of 2-ME added to the bulk solution, only around 12 ppm was present within the condensate. Additionally, 2-ME addition into the system resulted in a corrosion inhibitor efficiency of 93.8% where the chemical act as a mixed-type corrosion inhibitor. The corrosion and condensation experiments are complemented with surface characterization via XPS and STEM-EDX techniques. The surface characterization analysis showed a compact inner layer containing sulphur which is related to adsorption of the thiol.
2-巯基乙醇在顶级CO2腐蚀环境中的缓蚀和共缩聚行为
管线顶部腐蚀(TLC)是油气输送管道中存在的一个重要问题,它不仅会造成经济损失,还会造成生产损失。传统的有机缓蚀剂通常不能为这种特殊类型的腐蚀提供有效的保护。因此,TLC的化学抑制作用依赖于挥发性化合物,这些化合物可以从水溶液中分离到管道顶部形成的凝析液。研究表明,巯基化合物通过其对金属表面的高亲和力,在这种环境中提供了有效的抑制作用,但其抑制机制和共缩聚特性尚未完全确定。本研究通过一种新的直接评估冷凝化学和实时TLC测量方法,研究了2-巯基乙醇(2-ME)作为挥发性缓蚀剂在含co2的TLC环境中的效率、吸附机理和冷凝行为。通过实施以巯基为目标的生化技术,再加上用于实时、原位电化学TLC测量的微型电极配置,对冷凝物分配进行了实验分析。所提出的分析结果是一种快速、经济有效的筛选技术,可以监测与水相结合的硫醇基化学物质。新开发的生化方法确定,从20 ppm的2-ME添加到散装溶液中,只有12 ppm左右存在于冷凝液中。此外,在体系中加入2-ME后,缓蚀剂的效率达到93.8%,其中该化学物质作为混合型缓蚀剂。腐蚀和冷凝实验辅以XPS和STEM-EDX技术的表面表征。表面表征分析表明,其内层致密,含硫,这与硫醇的吸附有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
7.50
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