Mendes Mariana T, Dos Santos Andressa O, Perez Rafael F, Karnitz Junior Osvaldo, Mansur Claudia R E
Programa de Engenharia Metalúrgica e de Materiais-PEMM/COPPE, Universidade Federal do Rio de Janeiro, Av. Horácio Macedo, 2030 - Bloco F-CT, Cidade Universitária, Rio de Janeiro - RJ 21941-598, Brazil.
Instituto de Macromoléculas/Laboratório de Macromoléculas e Colóides na Indústria de Petróleo, Universidade Federal do Rio de Janeiro, Rua Moniz Aragão, 360. Bloco 8G-CT2, Cidade Universitária, Rio de Janeiro - RJ 21941-594, Brazil.
ACS Omega. 2025 May 14;10(20):20515-20523. doi: 10.1021/acsomega.5c00847. eCollection 2025 May 27.
Polydimethylsiloxane (PDMS)-based oil antifoams are extensively employed, but still, their impact on oil remains inconclusive due to the intricate nature and diverse composition of the oil. So far, the literature declares asphaltenes as the main contributors to foam stabilization followed by resins, along with short-chain carboxylic acids, solids, and even naphthenic acids. The present work aims to study the influence of antifoam formulations containing silicones of different molar masses on the oil/air interface, as well as evaluate its influence on the fractions separately, that is, on asphaltenes, on the model solution/air interface, and also on resins, examining the maltene/air interface. Hence, the interfacial rheology technique utilizing the Double Wall Ring (DWR) accessory was employed to assess the viscoelastic behavior of oil and its constituents (asphaltenes and maltenes) in the presence of antifoam products. This approach aims to gain insight into how these products interact with the oil-air interface and the various fractions of the oil. The findings from the DWR accessory align with the results of the foam formation tests, indicating that the products demonstrating superior efficacy in reducing the initial foam height also played a role in decreasing the interfacial elastic modulus of the respective systems.
基于聚二甲基硅氧烷（PDMS）的油性消泡剂被广泛使用，但由于油的性质复杂且成分多样，它们对油的影响仍无定论。到目前为止，文献表明沥青质是泡沫稳定的主要贡献者，其次是树脂，还有短链羧酸、固体甚至环烷酸。本工作旨在研究含有不同摩尔质量硅氧烷的消泡剂配方对油/气界面的影响，并分别评估其对各馏分的影响，即对沥青质在模型溶液/气界面的影响，以及对树脂在软沥青/气界面的影响。因此，利用双壁环（DWR）附件的界面流变学技术被用于评估在消泡剂存在下油及其成分（沥青质和软沥青）的粘弹性行为。该方法旨在深入了解这些产品如何与油-气界面以及油的各个馏分相互作用。DWR附件的研究结果与泡沫形成测试的结果一致，表明在降低初始泡沫高度方面表现出卓越效果的产品也在降低相应体系的界面弹性模量方面发挥了作用。
