Application of low-field nuclear magnetic resonance to assess the onset of asphaltene precipitation in petroleum

Morgan, Vinícius G.; Bastos, Thabita M.; Sad, Cristina M. S.; Leite, Juliete S. D.; Castro, Eustáquio R.V.; Barbosa, Lúcio L.

doi:10.1016/j.fuel.2019.116955

Cited by 17 publications

(14 citation statements)

References 43 publications

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“…Different standard methods and instruments are used to determine these properties of liquid fuels . Standard methods are often time-consuming and laborious and have complex analytical procedures; additionally, these methods may need toxic and hazardous solvents, destroy the sample, and generate high costs. − Because of the undeniable advantages of TD-NMR, specifically its rapidity, nondestructiveness, and noninvasiveness and the robust correlations of the NMR parameters with physical parameters, this technique is proposed as an alternative to standard analytical methods. − …”

Section: Reviewmentioning

confidence: 99%

“…The creation of a general model, however, is hardly possible because of the high variation in the physical and chemical properties of crude oils of different origins . On the other hand, it was shown that single-source crude oils can be classified into different qualities on the basis of their viscosity or API gravity calculated from T 2 and/or their relative hydrogen index (RHI) value. ,, Additionally, in one recent paper the asphaltene content and asphaltene precipitation in crude oils were measured by a unified approach for six crude oils (light, medium, and heavy) …”

Section: Reviewmentioning

confidence: 99%

“…Monoexponential functions or the inverse Laplace transform (ILT) were the methods most often used to determine the single T 2 in the review papers (Table ). For example, single T 2 , R 2 , or ln T 2 values were acquired for the biodiesel, diesel, and petroleum fractions. , Monoexponential fitting was applied to the CPMG decays measured for n -heptane/oil mixtures . With regard to crude oil–water emulsions, the NMR relaxation time distributions, calculated by the ILT, are typically bimodal, in which one peak, with a lower T 2 , refers to oil and the other one refers to water. , These signals are usually very well distinguished. , However, the peak on the ILT related to the signal from oil can represent a broad band, as shown in ref .…”

Section: Reviewmentioning

confidence: 99%

“…24,26,31 Additionally, in one recent paper the asphaltene content and asphaltene precipitation in crude oils were measured by a unified approach for six crude oils (light, medium, and heavy). 27 Combustible biofuels, such as black liquors and pyrolysis oils, are rarely analyzed by TD-NMR technology. 36−39 In these studies, correlations between several NMR relaxation parameters (free induction decay (FID) magnitudes, T 1 , and T 2 ) and solids content (SC) and the viscosity of black liquors were reported.…”

Section: ■ Introductionmentioning

confidence: 99%

“…22,26 Monoexponential fitting was applied to the CPMG decays measured for nheptane/oil mixtures. 27 With regard to crude oil−water emulsions, the NMR relaxation time distributions, calculated by the ILT, are typically bimodal, in which one peak, with a lower T 2 , refers to oil and the other one refers to water. 29,32 These signals are usually very well distinguished.…”

Section: ■ Introductionmentioning

confidence: 99%

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Time-Domain NMR in Characterization of Liquid Fuels: A Mini-Review

Nikolskaya

Hiltunen

2020

Energy Fuels

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Low-field nuclear magnetic resonance (LF-NMR) is a highly promising method for characterizing the different physical parameters and chemical structures of liquid fuels. In particular, there have been a variety of essential applications by means of time-domain NMR (TD-NMR). These applications can be developed for the characterization of petroleum fuels and biofuels, reaction monitoring, or process and quality control of liquid fuels. However, only a few applications have demonstrated the use of TD-NMR via on-line measurements. The principle of the majority of reviewed TD-NMR applications is based on finding the correlation between NMR and physical parameters. Special attention in this mini-review is paid to the description of on-line TD-NMR applications. ■ REVIEWAn overview of the LF-NMR analyses of crude oils, lubricant oils, diesel/biodiesel fuels, and edible oils has recently been published by Rudszuck et al., 21 in which both TD-NMR and NMR spectroscopy were taken into account. In that review, papers were categorized on the basis of their processing stage,

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Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Time-Domain NMR in Characterization of Liquid Fuels: A Mini-Review

Nikolskaya

Hiltunen

2020

Energy Fuels

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Time domain NMR: An alternative for study of the asphaltenes precipitated in petroleum

Morgan

Sad

Leite

et al. 2022

Magnetic Reson in Chemistry

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During the oil production and processing stages, the asphaltene precipitation is one of the great operation problems of oil industry. It can precipitate in the formation, tubing, or surface, causing operating problems, such as reduction in oil recovery by changing the reservoir permeability and wettability, clogging of the pipelines, and difficulty in separations process. The quantification of asphaltenes in petroleum by ASTM D6560 standard method is very laborious and use of a larger solvent volume than necessary. The present work proposes the use of time domain nuclear magnetic resonance (TD‐NMR) as new methodology to quantify the asphaltene precipitated in crude oil. Three (light, medium, and heavy) crude oils with asphaltenes content of 0.97, 1.88, and 7.00 wt% were mixed with n‐heptane in different R (ml of solvent/g of oil) values and analyzed by means of transverse relaxation time (T2). According NMR results, the R values enough for complete asphaltene precipitation for the oils A, B, and C were, respectively, equal to 16.50, 23.00, and 39.50 ml g−1. These outcomes represent a reduction of 58.75%, 42.50%, and 1.25% in the solvent volume per mass of oil for the oil A, B, and C, respectively, compared to the ASTM D6560 method, which imposes 40 ml g−1. Therefore, it has been shown that TD‐NMR can be applied to estimate the amount of asphaltene precipitated in petroleum and have potential to be applied in routine analysis with advantages of saving time and costs.

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Application of time domain nuclear magnetic resonance (TD‐NMR) for study of the distillation curve of petroleum

Montes

Morgan

Kock

et al. 2022

Magnetic Reson in Chemistry

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Crude oil distillates are a highly useful industrial product, mainly for energy generation. Unfortunately, they are rarely studied, mainly due to the low accessibility to products directly obtained from the distillation process, which is a laborious, expensive, and time-consuming operation. This work presents and discusses the use of time-domain nuclear magnetic resonance (TD-NMR) as a simple, affordable, and straightforward tool for the development of correlations supported on the transverse relaxation time (T 2 ) and boiling temperature. The results point out a high convergence between TD-NMR experimental data and the ASTM D2892 method for distillates from light, medium, and heavy oils, with up to 52.20% of accumulated mass and boiling point temperature (T b ) up to 400 C. Furthermore, an unprecedented relationship between T 2 values and the accumulated mass of the distillates is first demonstrated. This new insight opens new perspectives for future prediction of accumulated mass for unknown crude oils, placing the TD-NMR relaxometry as an appeal spectroscopy approach with a potential to meaningfully contribute to the daily refining petrochemical industry field operations.

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Application of low-field nuclear magnetic resonance to assess the onset of asphaltene precipitation in petroleum

Cited by 17 publications

References 43 publications

Time-Domain NMR in Characterization of Liquid Fuels: A Mini-Review

Time-Domain NMR in Characterization of Liquid Fuels: A Mini-Review

Time domain NMR: An alternative for study of the asphaltenes precipitated in petroleum

Application of time domain nuclear magnetic resonance (TD‐NMR) for study of the distillation curve of petroleum

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