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

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

doi:10.1016/j.jcis.2003.11.034

Cited by 63 publications

(49 citation statements)

References 17 publications

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“…T304 and T904 led to the most homogeneous systems with any glyceride. By contrast, T1307 and PF127, both of much higher HLB (22)(23)(24) were only miscible with Labrasol, which is the most hydrophilic glyceride evaluated. The systems that evidenced phase separation, or were off-white or turbid contained droplets of much greater size (20-60 μm) than the clear-translucent systems (<1 μm; Fig.…”

Section: Glyceride/copolymer Systemsmentioning

confidence: 91%

“…Differently from linear Pluronics, the X-shaped Tetronics, are formed by four PPO-PEO chains bonded to an ethylene diamine central group, which provides pH-responsive micellization properties (20,21). Despite the utility of Pluronics and Tetronics as stabilizers of oily phases (22)(23)(24), Pluronics and Tetronics have received minimal (25) or no attention as S(M) EDDS components.…”

Section: Introductionmentioning

confidence: 99%

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Pluronic and Tetronic Copolymers with Polyglycolyzed Oils as Self-Emulsifying Drug Delivery Systems

et al. 2008

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Abstract. The potential of poly(ethylene oxide)-poly(propylene oxide) block copolymers Pluronic® F127 (PF127) and Tetronic® 304 (T304), 904 (T904) and 1307 (T1307) as components of solid self-(micro) emulsifying dosage forms, S(M)EDDS, was evaluated. The dependence of the self-associative properties of Tetronics on pH explained the low ability of the micelles to solubilize griseofulvin at acid pH (sevenfold increase) compared to at alkaline pH (12-fold). Blends of polyglycolyzed glycerides (Labrasol, Labrafac CC, and Labrafil M 1944CS) with each copolymer at two different weight ratios (80:20 and 60:40) were prepared, diluted in water, and characterized in terms of globule size, appearance and griseofulvin solubility. The blends with Labrasol led to microemulsions that are able to increase drug solubility up to 30-fold. SMEDD hard gelatine capsules filled with griseofulvin and Labrasol or Labrasol/ copolymer 80:20 showed a remarkable increase in drug solubility and dissolution rate, particularly when T904, T1307 or PF127 was present in the blend. This effect was more remarkable when the volume of the dissolution medium was 200 ml (compared to 900 ml), which can be related to a higher stability of the microemulsion when there is a greater concentration of the copolymer and glyceride in the medium.

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Section: Glyceride/copolymer Systemsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Pluronic and Tetronic Copolymers with Polyglycolyzed Oils as Self-Emulsifying Drug Delivery Systems

et al. 2008

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“…One liter of each emulsion was prepared by shearing the fluids in a Polytron PT 3100 homogenizer, at 8000 rpm for 3 min. 50 The emulsion demulsification was evaluated by bottle tests. 100 mL of emulsion was previously heated at the assay temperature before adding 100 mL of 50 w/v % demulsifier base solution in toluene, which corresponds to ~50 ppm of active-material of the demulsifier base (B1, B2 or B3) added to the emulsion.…”

Section: Demulsification Testsmentioning

confidence: 99%

Effect of the structure of commercial poly(ethylene oxide-b-propylene oxide) demulsifier bases on the demulsification of water-in-crude oil emulsions: elucidation of the demulsification mechanism

et al. 2010

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Recebido em 29/10/09; aceito em 8/4/10; publicado na web em 24/8/10Water-in-crude oil emulsions are formed during petroleum production and asphaltenes play an important role in their stabilization. Demulsifiers are added to destabilize such emulsions,however the demulsification mechanism is not completely known. In this paper, the performances of commercial poly(ethylene oxide-b-propylene oxide) demulsifiers were studied using synthetic water-in-oil emulsions and model-systems (asphaltenes in organic solvent). No change in the asphaltene aggregate size induced by the demulsifier was observed. The demulsification performance decreased as the asphaltene aggregate size increased, so it can be suggested that the demulsification mechanism is correlated to the voids between the aggregates adsorbed on the water droplets surface.

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“…19,20 Among the commercial demulsifiers are ethoxylated phenol-formaldehyde resins and poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) block copolymers. [21][22][23][24] Among the properties desired of demulsifiers are high adsorption speed at the water-oil interface, displacement of the natural emulsifiers that stabilize the emulsions and formation of thin and fragile films at the water-oil interface, facilitating coalescence of the droplets. 16,25,26 The aim of this work was to study the influence of crude oil asphaltenes subfractions, obtained and characterized previously, 27 on the stability of water-in-oil (W/O) emulsions.…”

Section: Introductionmentioning

confidence: 99%

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

Honse¹,

Mansur²,

Lucas³

2012

J. Braz. Chem. Soc.

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O petróleo é produzido na forma de emulsão água em óleo e os asfaltenos são considerados os principais responsáveis pela estabilização dessas emulsões. O objetivo deste trabalho foi avaliar a influência de diferentes frações asfaltênicas sobre a estabilidade de emulsões modelo de petróleo (salmoura em asfaltenos/tolueno) e sobre a eficiência de desemulsificantes. A estabilidade das emulsões foi acompanhada pelo ensaio de garrafa, com e sem a adição de desemulsificante. Os resultados mostram que a amostra de asfaltenos com larga distribuição de polaridade promove maior estabilidade da emulsão do que a amostra com distribuição mais estreita e polaridade intermediária. Além disso, a eficiência do desemulsificante na separação das emulsões está diretamente relacionada à estabilidade original da emulsão. Resultados de tensão interfacial evidenciaram a eficiência de deslocamento dos asfaltenos pelos tensoativos desemulsificantes, o que ocorreu com maior eficiência para as emulsões contendo frações de asfaltenos com distribuição estreita e polaridade intermediária.Crude oil is produced as water-in-oil emulsion, and asphaltenes have been considered the main responsible by their stabilization. The aim of this work was to evaluate the influence of the asphaltenes subfractions on the stability of petroleum model emulsions and on the efficiency of demulsifiers. Model water-in-oil emulsions were prepared: aqueous phase of brine and oil phase of asphaltenes in toluene. Different asphaltenes fractions were used. The emulsions' stability was assessed by the bottle test, with and without adding demulsifier. The results show that a sample of asphaltenes with broad polarity distribution promotes greater emulsion stability than a sample with narrow distribution and intermediate polarity. Besides this, the efficiency of demulsifiers in separating the emulsions is directly related to the original stability of the emulsion. Measurements of the interfacial tension revealed the efficiency of displacement of the asphaltenes by the demulsifiers, which occurred more efficiently for the emulsions containing asphaltenes fractions with narrow distribution and intermediate polarity.

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

Cited by 63 publications

References 17 publications

Pluronic and Tetronic Copolymers with Polyglycolyzed Oils as Self-Emulsifying Drug Delivery Systems

Pluronic and Tetronic Copolymers with Polyglycolyzed Oils as Self-Emulsifying Drug Delivery Systems

Effect of the structure of commercial poly(ethylene oxide-b-propylene oxide) demulsifier bases on the demulsification of water-in-crude oil emulsions: elucidation of the demulsification mechanism

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

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