Chapter 9 Potential applications of bioemulsifiers in the oil industry

Bach, Horacio; Gutnick, David L.

doi:10.1016/s0167-2991(04)80150-2

Cited by 20 publications

(15 citation statements)

References 163 publications

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“…On the other hand, less-studied high molecular weight biosurfactants, usually referred to as bioemulsifiers, can form and stabilize oil in water or water in oil emulsions, but are not necessarily efficient detergents that are able to demonstrate remarkable surface tension reduction (Bach and Gutnick 2004). These high-molecular weight biosurfactants are highly efficient emulsifiers that work at low concentrations and exhibit considerable substrate specificity.…”

Section: Introductionmentioning

confidence: 99%

Bioemulsifier production by a halothermophilic Bacillus strain with potential applications in microbially enhanced oil recovery

et al. 2007

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A halothermotolerant Gram-positive spore-forming bacterium was isolated from petroleum reservoirs in Iran and identified as Bacillus licheniformis sp. strain ACO1 by phenotypic characterization and 16S rRNA analysis. It showed a high capacity for bioemulsifier production and grew up to 60 degrees C with NaCl at 180 g l(-1). The optimum NaCl concentration, pH and temperature for bioemulsifier production were 4% (w/v), 8.0, and 45 degrees C, respectively. Although ACO1 did not utilize hydrocarbons, it had a high emulsifying activity (E (24) = 65 +/- 5%) on different hydrophobic substrates. Emulsification was optimal while growing on yeast extract as the sole carbon source and NaNO(3) as the nitrogen source. The efficiency of the residual oil recovery increased by 22% after in situ growth of B. licheniformis ACO1 in a sand-pack model saturated with liquid paraffin.

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Section: Introductionmentioning

confidence: 99%

Bioemulsifier production by a halothermophilic Bacillus strain with potential applications in microbially enhanced oil recovery

et al. 2007

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“…The viscosity of emulsions was measured by a Brook Field DV-II+Pro viscometer (Massachusetts, USA). Decrease in emulsion viscosity was an indicator of the formation of the oil-in-water emulsion [6,9]. …”

Section: Formation Of Heavy Oil-in-water Emulsionmentioning

confidence: 99%

“…While chemical emulsifiers are both inexpensive and efficient, they may impose very negative effects on the environment; bioemulsifiers have been suggested as alternatives. Some microorganisms, including bacteria and fungi, produce emulsifiers that can emulsify hydrocarbons and stabilize emulsions [8][9][10][11][12]. There are two types of surface-active compounds which are produced by microorganisms: biosurfactants and bioemulsifiers.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Heavy Oil‐Water Emulsions using a Bio/Chemical Emulsifier Mixture

et al. 2011

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In this study, the viscosity reduction of heavy oil has been investigated through the formation of oil-water emulsion using a bio/chemical emulsifier mixture. Four bioemulsifiers from indigenous Rhodococcus ergthropolis and Bacillus licheniformis strains were used to stabilize a highly-viscous oil-in-water emulsion. The Taguchi method with an L 9 orthogonal array design was used to investigate the effect of various control factors on the formation of the oil/water emulsions. An emulsion with lowest viscosity was formed using ACO4 strain. The substantial stability of the oil-in-water emulsion allows the heavy oil to be transported practically over long distances or remain stationary for a considerable period of time prior to utilization. As the result of Taguchi analysis, the temperature and concentration of the emulsifier had a significant influence on viscosity reduction of the emulsion.

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“…Other potential applications in the petroleum industry are reviewed in Bach and Gutnick (2004) including viscosity reduction during pipeline transport following formation of heavy oil/water emulsions, and production of fuel oil/water emulsions for direct combustion (Gutnick et al, 1991). The emulsan produced by Acinetobacter sp.…”

Section: Stabilization Of Oil-water Emulsions Biosorption and Bioemmentioning

confidence: 99%

“…When the biodegradation of emulsan-treated and untreated crude oil by Acinetobacter was compared (Foght et al, 1989), the treatment stimulated aromatic mineralization but reduced mineralization of linear alkanes and other saturated hydrocarbons, both by pure cultures and by a mixed bacterial population. The inhibitory effect may be due to a requirement for a direct physical interaction of the cells with the hydrophobic substrate.Other potential applications in the petroleum industry are reviewed in Bach and Gutnick (2004) including viscosity reduction during pipeline transport following formation of heavy oil/water emulsions, and production of fuel oil/water emulsions for direct combustion (Gutnick et al, 1991). The emulsan produced by Acinetobacter sp.…”

mentioning

confidence: 99%

Safety Assessment of Transgenic Organisms, Volume 4

2010

Harmonisation of Regulatory Oversight in Biotechnology

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Chapter 9 Potential applications of bioemulsifiers in the oil industry

Cited by 20 publications

References 163 publications

Bioemulsifier production by a halothermophilic Bacillus strain with potential applications in microbially enhanced oil recovery

Bioemulsifier production by a halothermophilic Bacillus strain with potential applications in microbially enhanced oil recovery

Stabilization of Heavy Oil‐Water Emulsions using a Bio/Chemical Emulsifier Mixture

Safety Assessment of Transgenic Organisms, Volume 4

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