Differential scanning calorimetry characterization of water-in-oil emulsions from Mexican crude oils

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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“…In this case, calorimetric measurements can be used. 31 Determination of the saltwater/asphaltene dispersion interfacial tensions…”

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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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“…The crude oil samples from the Gulf of Mexico were characterized as described elsewhere (Castro and Vazquez, 2009); Table 1 lists the characteristics physicochemical properties of the heavy Mexican crude oil employed in this work (Castro and Vazquez, 2009;Diaz-Ponce et al, 2010). Evaluation by bottle testing was roughly performed as follows: to graduated bottles (15 mL volume), crude oil was added in quantities up to 100 mL.…”

Section: Demulsifier Evaluationmentioning

confidence: 99%

Experimental and theoretical study of bifunctionalized PEO–PPO–PEO triblock copolymers with applications as dehydrating agents for heavy crude oil

Flores-Sandoval

Castro

Flores

et al. 2017

Arabian Journal of Chemistry

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A series of a,x-diamines of polyoxyethylene-polyoxypropylene-polyoxyethylene (POE-POP-POE) triblock copolymer was synthesized and experimentally evaluated as dewatering agents for heavy crude oil. A quantitative structure-activity relationship (QSAR) study of the effect of the secondary amine structure over the yield of nucleophilic substitution reactions with a,x-ditosylate ester of PEO-PPO-PEO triblock copolymer was performed exclusively at the DFT level. Multiple linear regression (MLR) analysis including softness or hardness parameters gave R 2 = 0.9062, producing an equation with an acceptable r 2 mðtestÞ value. Furthermore, in order to understand the physicochemical interaction between the functionalizing copolymers and water, QSAR models

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“…That is the reason why it is preferable to determine an empirical correlation between r and T* by comparing the most probable freezing temperatures obtained from DSC thermal analysis and the mean droplet size obtained by another analytical technique (optical microscopy for instance). Applications of thermogranulometry for crude oil emulsions may be found in [86,91].…”

Section: Crude Oil Emulsions In Productionmentioning

confidence: 99%

Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

Clausse

Dalmazzone

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Conge´lation dans les e´mulsions : aspects the´oriques et applications techniques -Cet article se concentre principalement sur le comportement a`la conge´lation des e´mulsions qui sont conside´re´es soit comme des syste`mes permettant d'obtenir des informations sur les mate´riaux en surfusion, soit comme des syste`mes disperse´s complexes implique´s dans les proce´de´s industriels. En raison du fait qu'il existe une phase disperse´e sous forme de fines gouttelettes dans les e´mulsions, des retards a`la solidification sont observe´s et les gouttelettes de liquide persistent meˆme en dessous du point de fusion du mate´riau. La corre´lation entre la tempe´rature de solidification des gouttelettes et leur taille peut eˆtre donc utilise´e pour suivre l'e´volution de la morphologie de l'e´mulsion en fonction du temps aussi bien sur terre que dans des conditions de microgravite´(projet FASES soutenu par l'ESA). Une description de ces phe´nome`nes observe´s principalement par microcalorime´trie sera donne´e pour des corps purs disperse´s ainsi que pour des solutions disperse´es. Dans certains cas, les e´mulsions peuvent eˆtre recherche´es pour leurs proprie´te´s spe´cifiques, telles que la grande taille de l'interface huile/eau, conduisant a`des transferts de masse ame´liore´s; les e´mulsions peuvent eˆtre par conse´quent utilise´es comme des membranes liquides pour l'extraction, le stockage et la libe´ration controˆle´e de matie`res actives. Dans d'autres cas, la formation d'e´mulsions a un effet ne´faste sur les proce´de´s, comme dans l'industrie pe´trolie`re ou`des e´mulsions eau-dans-pe´trole tre`s stables se forment facilement et compliquent l'ope´ration de de´shydratation du pe´trole brut.Abstract -Freezing Within Emulsions: Theoretical Aspects and Engineering Applications -This article is mainly focused on the freezing behaviour of emulsions which will be considered either as systems permitting to get information about undercooled materials or as complex dispersed systems involved in industrial processes. Due to the fact that there exists a phase dispersed as tiny droplets in emulsions, solidification delays are observed and liquid droplets are still observed under the melting points of pure materials. The correlation between the solidification temperature of the droplets and their size may be therefore used to follow the evolution of the emulsion morphology versus time on ground as in microgravity conditions (FASES project supported by ESA). A description of these phenomena mainly observed through microcalorimetry experiments will be given for dispersed pure materials as for dispersed solutions. In some cases, emulsions may be sought after for their specific properties, such as their large oil/ water interface, leading to enhanced mass transfers; emulsions may be consequently used as liquid membranes for extraction, storage and controlled release of active materials. In other cases, the formation of emulsions has a detrimental effect on the process. It is the case in the oil industry where very stable w...

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Differential scanning calorimetry characterization of water-in-oil emulsions from Mexican crude oils

Cited by 17 publications

References 29 publications

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

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

Experimental and theoretical study of bifunctionalized PEO–PPO–PEO triblock copolymers with applications as dehydrating agents for heavy crude oil

Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

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