Brazilian Journal of Chemical Engineering最新文献

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Modeling and simulation of samarium and neodymium separation by a solvent extraction process 溶剂萃取法分离钐钕的建模与模拟

IF 1.2 4区工程技术 Q3 Chemical Engineering

Brazilian Journal of Chemical Engineering

Pub Date : 2023-11-17 DOI: 10.1007/s43153-023-00411-1

Marcelo De Luccas Dourado, Davi Gomes de Carvalho, Ysrael Marrero Vera

The demand for permanent magnets is expected to increase in the 2021–2030 decade, which will require a commensurate increase in the production of samarium (Sm) and neodymium (Nd). Since these metals are considered critical and due to their abundance in Brazilian territory, the Brazilian government and mining companies must master the refining of these metals through autochthonous technologies. Thus, we developed a process to separate the light (La, Ce, Pr and Nd) from the medium (Sm, Eu and Gd) and heavy (Tb-Lu and Y) rare earth elements (REE) with D₂EHPA by empirical modeling of solvent extraction (SX) processes. The experimental methodology included three phases: equilibrium data acquisition from batch experiments, solvent extraction simulation, and continuous process trials to validate the model on a mini-pilot scale. Our simulation predicted 99.5% Sm organic recovery and 80% Nd aqueous recovery in a seven-stage process and 0.30 A/O ratio, validated in the continuous trial. This work paves the way for establishing Brazilian technology to obtain the constituent elements of permanent magnets.

永磁体的需求预计将在2021-2030年的十年中增加，这将需要相应增加钐(Sm)和钕(Nd)的产量。由于这些金属被认为是至关重要的，而且在巴西境内储量丰富，巴西政府和矿业公司必须通过本土技术掌握这些金属的提炼。因此，我们开发了一种方法来分离轻(La, Ce, Pr和Nd)从介质(Sm, Eu和Gd)和重(Tb-Lu和Y)稀土元素(REE)与D2EHPA溶剂萃取(SX)过程的经验模型。实验方法包括三个阶段:从批量实验中获取平衡数据，溶剂萃取模拟，以及在小型中试规模上验证模型的连续过程试验。我们的模拟预测，在7个阶段的过程中，Sm有机回收率为99.5%，Nd水回收率为80%，a /O比为0.30，并在连续试验中得到验证。这项工作为建立巴西技术以获得永磁体的组成元素铺平了道路。

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引用次数: 0

Evaluation of fluid–fluid and rock–fluid interfacial interactions using silica nanofluids and crude oil for a deepwater carbonate pre-salt field 利用二氧化硅纳米流体和原油评价深水碳酸盐岩盐下油田的流体-流体和岩石-流体界面相互作用

IF 1.2 4区工程技术 Q3 Chemical Engineering

Brazilian Journal of Chemical Engineering

Pub Date : 2023-11-17 DOI: 10.1007/s43153-023-00419-7

Nathália Pereira Dias, Helen Conceição Ferraz, João Victor Nicolini, Paulo Couto, Santiago Drexler, Tiago Albertini Balbino

The biggest challenges for E&P activities are the high viscosity of the oil, the geology of the formation, the high interfacial tensions (IFT) between fluids and the reservoir wetting conditions. Enhanced oil recovery (EOR) methods are applied to modify fluid–fluid and fluid–rock interactions in the reservoir, facilitating the oil displacement and, consequently, increasing the recovery factor. In this work, the use of silica nanofluids as EOR method to reduce the IFT and to change the wettability conditions of reservoir rock were evaluated. For experimental tests, crude oil from a reservoir in a Brazilian Pre-salt field was used as oleic phase. No significant change in IFT was observed with an increase in the concentration of SiNPs for both distilled water and low salinity water (1000 ppm) dispersant fluids. The significant reduction of the contact angle is observed for nanofluids with 0.02 wt% SiNP. Finally, the Amott test was performed in a carbonate rock sample to reaffirm the action of these chemicals in oil recovery, corroborating the potential of nanofluids to EOR applications. Thus, this work might contribute to a more rational design of nanoEOR strategies and technological innovations in carbonate reservoirs, especially those addressed to the South American Deepwater sector.

Graphical abstract

勘探开发面临的最大挑战是石油的高粘度、地层的地质条件、流体之间的高界面张力(IFT)和储层的润湿条件。提高采收率(EOR)方法用于改善储层中流体-流体和流体-岩石的相互作用，促进驱油，从而提高采收率。研究了利用二氧化硅纳米流体作为提高采收率的方法，以降低IFT和改变储层岩石的润湿性条件。在实验测试中，采用巴西盐下油田油藏的原油作为油相。蒸馏水和低盐度水(1000 ppm)分散剂液体的sinp浓度增加时，未观察到IFT有显著变化。对于SiNP为0.02 wt%的纳米流体，观察到接触角的显著减小。最后，在碳酸盐岩样品中进行了Amott测试，以确认这些化学物质在采油中的作用，证实纳米流体在EOR应用中的潜力。因此，这项工作可能有助于更合理地设计碳酸盐岩储层的纳米eor策略和技术创新，特别是针对南美深水区块。图形抽象

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引用次数: 0

Preferential solvation of azoxystrobin in binary solvent mixtures of (methyl alcohol + ethyl ethanoate) and (n-propyl alcohol + ethyl ethanoate) 偶氮嘧菌酯在(甲醇+乙基乙醇)和(正丙醇+乙基乙醇)二元溶剂混合物中的优先溶剂化