Mechanism and Kinetics of Separation of Oil From Oil-in-Water Emulsion by Air Flotation

Rajak, Vinay Kumar; Relish, K. K.; Kumar, Shashikant; Mandal, Ajay

doi:10.1080/10916466.2015.1108987

Cited by 38 publications

(21 citation statements)

References 11 publications

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“…Salts are added to water as negative surfactants and the surface tension increases with increasing salt concentration. It was reported that the bubble size decreased and the bubble gas holdup increased with the addition of electrolyte salt to water because the electrolyte stabilized the bubbles and decreased the bubble coalescence rate . Both positive and negative surfactants inhibit bubble coalescence and the inhibition effect usually increases with surfactant concentration …”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the bubble size decreased and the bubble gas holdup increased with the addition of electrolyte salt to water because the electrolyte stabilized the bubbles and decreased the bubble coalescence rate. 19,20 Both positive and negative surfactants inhibit bubble coalescence and the inhibition effect usually increases with surfactant concentration. 14 Although surfactant additive has been shown to strongly affect the bubble coalescence and breakup behaviors, most research only studied low ranges of surfactant concentration.…”

Section: Introductionmentioning

confidence: 99%

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Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Guo

Wang

Yang

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND: Bubble column reactors are widely used in chemical processes and wastewater processing. The relevant properties of surface tension play important roles in the hydrodynamics and bubble coalescence and breakup. However, the underlying mechanisms are complicated and need further research. In this work, the bubble behaviors were studied in a bubble column of 0.1 m i.d. with pure liquids of different surface tension and alcohol solutions varying in concentration and alcohol type.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Guo

Wang

Yang

et al. 2016

J of Chemical Tech & Biotech

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show abstract

“…Their results showed that the probability of collision between bubbles and n-dodecane increased, thus the flotation efficiency improved. Rajak et al [26] have indeed confirmed the abovementioned relations between bubble size and water salinity. They have enhanced flotation efficiency to separate oil from oil-in-water emulsions by increasing water salinity.…”

Section: Introductionmentioning

confidence: 64%

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Orlando

Barca

Klein

et al. 2019

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

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Chemical Enhanced Oil Recovery (EOR) can boost oil extraction in offshore operations, however one of the main concerns regarding its application is how the efficiency of flotation units for treating produced water is affected. The present work thus focuses on investigating the impact of EOR chemicals on the physical properties of EOR effluents and how this can affect flotation performance parameters such as bubble size and gas holdup. Design of experiments has been used to assess the influence of polymer, surfactant and sodium chloride concentrations on bubble size and gas holdup of a laboratorial bubble column. The influence of superficial gas velocity has also been assessed together with chemicals concentrations, yet at low levels in order to avoid clusters, swarms and foam. The characterization of the synthetic effluent containing polymer, surfactant and sodium chloride has indicated that the fluid behaves as a non-Newtonian fluid, what makes separation processes in flotation cells challenging. Results showed that polymer concentration of 2000 mg/L can lead to significant increases in fluid viscosity, promote a growth of more than 40% in bubble size and only increases gas holdup when surfactant is present at high concentration. Therefore, polymers are expected to be detrimental to produced water treatment. Surfactants decrease both fluid surface tension and bubble size, increasing gas holdup. For the range studied, superficial gas velocity favors gas holdup and sodium chloride concentration seems to weakly influence bubble size and gas holdup. This work highlights the fact that changes in physical properties of produced water do modify bubble size distribution and gas holdup and this must therefore be taken into account when flotation-like systems are designed to deal with EOR effluents.

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“…Commonly, traditional methods of separating oil from oil-in-water or water-in-oil emulsions contain flotation [7], coagulation [8], ultracentrifugation, chemical and electrochemical demulsification [9], gravity separation [10], and membrane filtration [11]. Due to its high efficiency, easy operation, and low-energy consumption, chemical demulsification is a practical method for treating oil-in-water emulsions [12].…”

Section: Introductionmentioning

confidence: 99%

Efficient Demulsification of Acidic Oil-In-Water Emulsions with Silane-Coupled Modified TiO2 Pillared Montmorillonite

Zuo

Wei

et al. 2019

Applied Sciences

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Emulsified pickling waste liquid, derived from cleaning oily hardware, cause serious environmental and ecological issues. In this work, a series of grafted (3-aminopropyl)triethoxysilane (APTES) TiO2 pillared montmorillonite (Mt), Ti-Mt-APTES, are prepared and characterized for their assessment in demulsification of acidic oil-in-water emulsion. After titanium hydrate is introduced through ion exchange, montmorillonite is modified by hydrophobic groups coming from APTES. The Ti-Mt-APTES in acidic oil-in-water emulsion demulsification performance and mechanism are studied. Results show that the prepared Ti-Mt-APTES has favorable demulsification performance. The Ti-Mt-APTES demulsification efficiency (ED) increased to an upper limit value when the mass ratio of APTES to the prepared TiO2 pillared montmorillonite (Ti-Mt) (RA/M) was 0.10 g/g, and the 5 h is the optimal continuous stirring time for breaking the acidic oil-in-water emulsion by Ti-Mt-APTES. The ED increased to 94.8% when 2.5 g/L of Ti-Mt-APTES is added into the acidic oil-in-water emulsion after 5 h. An examination of the demulsification mechanism revealed that amphiphilicity and electrostatic interaction both played vital roles in oil-in-water separation. It is demonstrated that Ti-Mt-APTES is a promising, economical demulsifier for the efficient treatment of acidic oil-in-water emulsions.

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Mechanism and Kinetics of Separation of Oil From Oil-in-Water Emulsion by Air Flotation

Cited by 38 publications

References 11 publications

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Efficient Demulsification of Acidic Oil-In-Water Emulsions with Silane-Coupled Modified TiO2 Pillared Montmorillonite

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