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

Rezende, D. A.; Bittencourt, Rafael R.; Mansur, Cláudia R. E.

doi:10.1016/j.petrol.2011.01.009

Cited by 18 publications

(14 citation statements)

References 16 publications

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“…However, the most common and robust method to control foam is to add antifoaming and defoaming agents [3,[71][72][73][74][75][76]. For foaming oils, these products are usually silicone oils, particularly PolyDiMethylSiloxane (PDMS) or fluorosilicone products for the most severe cases.…”

Section: Antifoaming and Defoaming In The Petroleum Industrymentioning

confidence: 99%

Non-Aqueous and Crude Oil Foams

Blázquez

Emond

Schneider

et al. 2013

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

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D o s s i e rRe´sume´-Mousses non aqueuses et mousses pe´trolie`res -Les mousses produites a`partir de syste`mes non aqueux sont moins fre´quentes que les mousses a`base d'eau, mais elles jouent un roˆle important dans de nombreuses applications et proce´de´s industriels. La faible tension de surface des liquides a`base d'hydrocarbures limite l'adsorption des agents de surface classiques et par conse´quent diffe´rents compose´s et me´thodes doivent eˆtre conside´re´s afin de ge´ne´rer et de stabiliser les mousses a`base d'huile. De meˆme, le cassage des mousses non aqueuses inde´sirables ne´cessite des conside´rations spe´cifiques a`ces syste`mes. Les mousses de pe´trole pre´sentent un inte´reˆt particulier de par leur complexite´en raison de la grande varie´te´des compose´s et des gaz qui peuvent les constituer. Nous pre´sentons dans cet article un aperc¸u des principaux me´canismes reconnus comme importants pour la stabilite´des mousses non aqueuses avec une conside´ration toute particulie`re pour les mousses de pe´trole brut.Abstract -Non-Aqueous and Crude Oil Foams -Foams produced from non-aqueous media are less common than water-based foams but they play an important role in many industries and engineering processes. The low surface tension of hydrocarbon fluids limits the adsorption of common surface activity substances and different compounds and methods must be considered to generate and stabilize oil-based foam. Likewise, the destruction of unwanted non-aqueous based foam requires specific considerations not found with aqueous systems. Of particular interest are petroleum-based foams, which are highly complex due to the wide variety of compounds and gases that can be found. We provide an overview of the major mechanisms known to be important for non-aqueous foam stability with a spotlight on crude-oil foams.

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Section: Antifoaming and Defoaming In The Petroleum Industrymentioning

confidence: 99%

Non-Aqueous and Crude Oil Foams

Blázquez

Emond

Schneider

et al. 2013

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

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“…The defoaming activity of these grafted polymers has been reported in the literature but only as suppressers of foams formed introducing air stream through degasified crude oils with asphaltene contents between 1.3 and 3.2 wt %. 8 To T h i s c o n t e n t i s the best of our knowledge, there are no reports on the antifoaming activity of polyethylene-grafted silicones in gasified crude oils with greater contents of asphaltenes, at temperature, pressure, and gas compositions close to those of industrial biphasic separators. The application of free silicone compounds as petroleum defoamers has also been considered.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The application of free silicone compounds as petroleum defoamers has also been considered. Poly(ethylene oxide)− poly(propylene oxide) (PEO−PPO) block bipolymers have been proposed as an alternative to silicone-based defoamers, 8 but the efficiency of these low-molecular-weight polymers is too small. In contrast, high-molecular-weight polyethers exhibit good performance as defoaming agents of heavy crude oil, 9 such as that of silicones, but their production cost remains greater than that of conventional crude oil defoamers.…”

Section: ■ Introductionmentioning

confidence: 99%

Effect of the Chemical Structure of Alkyl Acrylates on Their Defoaming Activity in Crude Oil: Experimental and Theoretical Studies

et al. 2021

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The study and development of non-silicon-based defoamers for crude oils have been slightly investigated worldwide, despite urgent requirements of the petroleum industry. The suppression of crude oils has usually been resolved using commercial silicone defoamers (polysiloxanes), but these compounds cause serious problems such as catalyst poisoning in petroleum refining processes. In this study, an acrylic homopolymer series with different molecular structures was synthesized by emulsion polymerization, to determine the influence of the chemical repetitive unit on the defoaming capability. The following acrylic homopolymers were considered: poly(methyl acrylate) (PMA), poly(ethyl acrylate) (PEA), poly(hexyl acrylate) (PHA), poly(2-ethylhexyl acrylate) (PEHA), and poly(dodecyl acrylate) (PDA). These polyacrylates were evaluated as foam suppressors in heavy crude oil, by means of a static method based on the sudden pressure drop of the system, which has the advantage of mimicking the gas/crude oil conditions in a biphasic separation tank. PHA, PEHA, and PDA showed greater antifoaming activity than that of silicones to suppress crude oil foam but only at an appropriate weight-average molecular weight (M̅w). The strong influence of the length of pendant groups in the repetitive unit, which constitutes polyacrylates, could be evidenced by this way. The defoaming activity of the series of acrylic homopolymers was correlated with two series of physicochemical parameters obtained by theoretical calculations using HyperChem software and by molecular dynamics simulations. A “pitching off” mechanism of bubble collapse could be clearly established by this last simulation method. These novel antifoaming agents, based on a variety of polyacrylates, are innocuous during crude oil refining, and their fabrication cost is economically competitive, so they can be applied in industrial separation tanks to eliminate petroleum foams.

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“…15 Positive values of these coefficients do not necessarily guarantee foam suppression, but they are essential for the application of antifoams, as more positive coefficients are usually linked to more likely antifoaming behavior. 19,21 Other considerations must be accounted for regarding crude oil foams. Differences in sizes of antifoam drops may affect the probability of effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Foaming of Oils: Effect of Poly(dimethylsiloxanes) and Silica Nanoparticles

Chen¹,

Huang²,

He³

et al. 2019

ACS Omega

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Foaming of oils often confronts researchers in food, cosmetics, and petrochemical industries. Destabilization or stabilization of nonaqueous foams is fundamentally crucial for process control and product quality. Antifoams can be a useful method to control excessive foams. Nonetheless, the foaming mechanisms and the selection criteria of the most common antifoam, poly(dimethylsiloxane) (PDMS) oils, are not thoroughly discussed. The study of inorganic colloidal particles as foam stabilizers has drawn particular attention over the past years practically and academically, yet only a small part of literature focuses on nonaqueous foams. For these reasons, we have studied the effects of PDMS oils and silica nanoparticles on the foaming of oils. We find that the performance of silicone oils as crude oil antifoams is firmly related to PDMS viscosity and crude oil composition presumably because the solubilization of PDMS oils in hydrocarbons reduces with increasing viscosity of the polymers and the hydrocarbons. The findings also illustrate that nanoparticle hydrophobicity and concentration are the primary factors for the foam stabilization effect.

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

Cited by 18 publications

References 16 publications

Non-Aqueous and Crude Oil Foams

Non-Aqueous and Crude Oil Foams

Effect of the Chemical Structure of Alkyl Acrylates on Their Defoaming Activity in Crude Oil: Experimental and Theoretical Studies

Foaming of Oils: Effect of Poly(dimethylsiloxanes) and Silica Nanoparticles

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