Low‐field NMR for quality control on oils

T Rudszuck, E Förster, H Nirschl… - Magnetic Resonance …, 2019 - Wiley Online Library
Oil is a prominent, but multifaceted material class with a wide variety of applications.
Technical oils, crude oils as well as edibles are main subclasses. In this review, the question …

[HTML][HTML] Discrimination of oils and fuels using a portable NIR spectrometer

FD Santos, LP Santos, PHP Cunha, FT Borghi… - Fuel, 2021 - Elsevier
Improper mixtures of: motor oil with crude oil; and derivatives mixed with other derivatives of
lesser commercial value were identified in Brazil by companies in the energy sector. This …

Cluster analysis of crude oils with k-means based on their physicochemical properties

A Sancho, JC Ribeiro, MS Reis, FG Martins - Computers & Chemical …, 2022 - Elsevier
The values of the physicochemical properties of crude oils vary significantly, depending on
their geographical origins. A standard categorization of crude oils is grossly based on the …

Effect of different cooking methods on proton dynamics and physicochemical attributes in Spanish mackerel assessed by low-field NMR

S Sun, S Wang, R Lin, S Cheng, B Yuan, Z Wang… - Foods, 2020 - mdpi.com
The states of protons within food items are highly related to their physical attributes. In this
study, the effect of cooking methods including boiling, steaming, roasting and frying on …

[HTML][HTML] Evaluation and determination of chloride in crude oil based on the counterions Na, Ca, Mg, Sr and Fe, quantified via ICP-OES in the crude oil aqueous extract

M de Oliveira Souza, MA Ribeiro, MTWD Carneiro… - Fuel, 2015 - Elsevier
Of the salts present in crude oil, sodium, calcium, magnesium, strontium and iron chlorides
are the most abundant and are considered the main cause of corrosion in crude oil …

Influence of Adding Asphaltenes and Gas Condensate on CO2 Hydrate Formation in Water–CO2–Oil Systems

GAB Sandoval, RL Thompson, CMS Sad… - Energy & …, 2019 - ACS Publications
Gas hydrate formation is a huge flow assurance problem in offshore production of oil and
gas. However, there have been some reported cases in oil-dominated systems where the …

Study of the effect of temperature and gas condensate addition on the viscosity of heavy oils

JFP Bassane, CMS Sad, DMC Neto, FD Santos… - Journal of Petroleum …, 2016 - Elsevier
Heavy and extra heavy oils have been the focus of attention since the conventional oil
reserves are becoming more scarce in the world. To explore and process these oils is a …

Characterisation and selection of demulsifiers for water-in-crude oil emulsions using low-field 1H NMR and ESI–FT-ICR MS

GF Carneiro, RC Silva, LL Barbosa, JCC Freitas… - Fuel, 2015 - Elsevier
Water-in-oil emulsions constitute a widespread issue for the oilfield industry. Indeed, the
phases of water-in-oil emulsions must be separated as soon as possible in the production …

Application of low field NMR as an alternative technique to quantification of total acid number and sulphur content in petroleum from Brazilian reservoirs

LL Barbosa, CMS Sad, VG Morgan, PR Figueiras… - Fuel, 2016 - Elsevier
Crude oils produced from different reservoirs in the world have very different chemical
compositions and physicochemical properties. Naphthenic acids and sulphur content can …

1H NMR spectroscopy and low-field relaxometry for predicting viscosity and API gravity of Brazilian crude oils–A comparative study

A Muhammad, RB de Vasconcellos Azeredo - Fuel, 2014 - Elsevier
Abstract 1 H NMR spectra and transversal relaxation time (T 2) distributions of 76 Brazilian
crude oil samples, ranging from light to extra-heavy, were measured and compared by …