Search results for: Claudia R.E. Mansur

Items from 1 to 9 out of 9 results

article

Development of microemulsions to reduce the viscocity of crude oil emulsions

Izabel C.V.M. Santos, Raquel R. Martelloti, Priscila F. Oliveira, Claudia R.E. Mansur

Fuel > 2017 > 210 > C > 684-694

The formation of water-in-oil (W/O) emulsions during extraction of petroleum is a major problem, because these emulsions increase the oil’s viscosity and thus significantly lower the production rates. In these situations, chemical products called emulsion viscosity reducers (EVRs) can be injected during crude oil production. The development of EVRs consisting of oil-in-water (O/W) microemulsions can...

article

Interfacial rheology of asphaltene emulsions in the presence of nanoemulsions based on a polyoxide surfactant and asphaltene dispersant

Priscila F. Oliveira, Izabel C.V.M. Santos, Hélida V.P. Vieira, Assis K. Fraga, more

Fuel > 2017 > 193 > C > 220-229

The development of oil-in-water nanoemulsions for application as demulsifiers has attracted a great deal of interest from chemical supply companies in the oil sector, due to the cost savings and advantages of replacing organic solvents with water. In this study, the efficiency of the nanoemulsions developed in a previous work in breaking down water/oil emulsions was correlated with assessments obtained...

article

Development of nanoemulsions containing a polyoxide surfactant and asphaltenes dispersant

Priscila F. Oliveira, Naiara C. Farias, Anny M.T. Marques, Assis K. Fraga, more

Fuel > 2016 > 181 > C > 64-74

This article reports the development of oil-in-water nanoemulsions containing additives capable of dispersing asphaltenes and evaluation of their use as a new alternative for breaking down oil emulsions. The nanoemulsions were prepared in the presence of a surfactant based on polyethylene oxide using a high pressure homogenizer with different processing conditions, which led to different droplet sizes...

article

Study of the interaction between asphaltenes and resins by microcalorimetry and ultraviolet–visible spectroscopy

Janaina I.S. Aguiar, Claudia R.E. Mansur

Fuel > 2015 > 140 > C > 462-469

Precipitation of asphaltenes causes large losses to the petroleum industry. Therefore, dispersant additives are generally used to prevent this precipitation. On the other hand, some studies indicate that asphaltenes can be stabilized by the presence of resins, but the mechanism by which asphaltenes are stabilized by resins or dispersant additives is not fully understood. The objective of this paper...

article

Determination of oil-in-water using nanoemulsions as solvents and UV visible and total organic carbon detection methods

Josane A. Costa, Naiara C. Farias, Yure G.C. Queirós, Claudia R.E. Mansur

Talanta > 2013 > 107 > Complete > 304-311

The aim of this study was to investigate the application of oil in water (O/W) nanoemulsion as solvent in the extraction step for determination of oil content in oily water, measured using a UV visible spectrophotometer (UV–vis) and a total organic carbon (TOC) analyzer. The optical micrographs and distribution size curves showed that the use of a small amount of nanoemulsion was capable of transforming...

article

Evaluation of nanoemulsions in the cleaning of polymeric resins

Josane A. Costa, Elizabete F. Lucas, Yure G.C. Queirós, Claudia R.E. Mansur

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2012 > 415 > Complete > 112-118

The development of nanotechnology has opened the way for applications in a wide range of fields. Nanoemulsions have attracted great interest because the properties of emulsions are enhanced as the interfacial film approaches equilibrium when formed by droplets of nanometric sizes. In the present study, Solbrax/water/polyoxyethylene nanoemulsions were produced by high-energy emulsification in a high-pressure...

article

Evaluation of the efficiency of polyether-based antifoams for crude oil

Danielle A. Rezende, Rafael R. Bittencourt, Claudia R.E. Mansur

Journal of Petroleum Science and Engineering > 2011 > 76 > 3-4 > 172-177

During petroleum extraction it is common for associated gas and water to be present. While the petroleum is flowing in pipes or being processed in gravitational separators, in order to break the water/oil (w/o) emulsions, these phases are subjected to agitation and shear forces. Due to the presence of natural lipophilic emulsifiers in the oil, it occurs as undesired foaming and this requires the addition...

article

PLURONIC x TETRONIC polyols: study of their properties and performance in the destabilization of emulsions formed in the petroleum industry

Claudia R.E. Mansur, Sheila P. Barboza, Gaspar González, Elizabete F. Lucas

Journal of Colloid And Interface Science > 2004 > 271 > 1 > 232-240

In this work, a new family of branched poly(ethylene oxide-propylene oxide) (PEO-PPO) block copolymers designed as TETRONIC polyols is evaluated and compared to linear PEO-PPO block copolymers designed as PLURONIC polyols. Additives have been employed as well in order to improve solubility of these materials in aqueous solution. Such additives include the sodium p-toluene sulfonate (NaPTS) hydrotrope...

article

Calorimetry and thermogravimetry as tools for the assessment of the thermal stability of polyoxide-based nonionic surfactants

Claudia R.E. Mansur, Gaspar González, Elizabete F. Lucas

Polymer Degradation and Stability > 2003 > 80 > 3 > 579-587

Differential scanning calorimetry (DSC) and thermogravimetry (TGA) have been used to evaluate the thermal stability of nonionic surfactants. We have studied monofunctional diblock copolymers of poly(ethylene oxide-propylene oxide) (R-PEO-PPO-OH, where R length is linear C ₄ or C ₁ ₂ _- ₁ ₄ ) as nonionic surfactants. It was observed that the thermal stability was dependent...

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Fuel (4)
Colloids and Surfaces A: Physicochemical and Engineering Aspects (1)
Journal of Colloid And Interface Science (1)
Journal of Petroleum Science and Engineering (1)
Polymer Degradation and Stability (1)
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