Optimization of separation of oil from oil-in-water emulsion by demulsification using different demulsifiers

Rajak, Vinay Kumar; Singh, Inderpreet; Kumar, Amit; Mandal, Ajay

doi:10.1080/10916466.2016.1181654

Cited by 64 publications

(24 citation statements)

References 16 publications

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“…The presence of hazardous components in emulsion can cause both environment pollution [3] and threaten human health by entering into food chain [4]. Conventional techniques, such as gravity separation, flotation, coagulation, ultra-centrifugation and membrane filtration have been used to separate oil from oil-in water (O/W) emulsions [5,6]. However, these methods are inefficiently in separation of oil from O/W emulsion, complicated instrument setup and high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Magnetically recoverable magnetite-reduced graphene oxide as a demulsifier for surfactant stabilized crude oil-in-water emulsion

et al. 2020

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Oily wastewater, especially water-oil emulsion has become serious environmental issue and received global attention. Chemical demulsifiers are widely used to treat oil-water emulsion, but the toxicity, non-recyclable and non-environmental friendly characteristic of chemical demulsifiers had limited their practical application in oil-water separation. Therefore, it is imperative to develop an efficient, simple, eco-friendly and recyclable demulsifiers for breaking up the emulsions from the oily wastewater. In this study, a magnetic demulsifier, magnetite-reduced graphene oxide (M-rGO) nanocomposites were proposed as a recyclable demulsifier to break up the surfactant stabilized crude oil-in-water (O/W) emulsion. M-rGO nanocomposites were prepared via in situ chemical synthesis by using only one type Fe salt and GO solid as precursor at room temperature. The prepared composites were fully characterized by various techniques. The effect of demulsifier dosage and pH of emulsion on demulsification efficiency (E D) has been studied in detailed. The demulsification mechanism was also proposed in this study. Results showed that M-rGO nanocomposites were able to demulsify crude O/W emulsion. The E D reaches 99.48% when 0.050 wt.% of M-rGO nanocomposites were added to crude O/W emulsion (pH = 4). Besides, M-rGO nanocomposites can be recycled up to 7 cycles without showing a significant change in terms of E D. Thus, M-rGO nanocomposite is a promising demulsifier for surfactant stabilized crude O/W emulsion.

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Section: Introductionmentioning

confidence: 99%

Magnetically recoverable magnetite-reduced graphene oxide as a demulsifier for surfactant stabilized crude oil-in-water emulsion

et al. 2020

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“…The sedimentation time is found to have a significant effect on breaking the emulsion after the addition of surfactant. The influence of time is represented by the availability of enough time for the thermodynamic phenomenon to occur, including sedimentation, flocculation, coalescence of water droplets, and phase separation [14]. Thus, Figure 5a shows that with increasing time, oil recovery improves because increasing time increases the probability of water droplet coalescence and enhances dehydration efficiency.…”

Section: Parameter Influence and Their Interaction With Demulsificatimentioning

confidence: 99%

“…It was concluded that increased salt concentration in water led to reduced stability of the emulsion, due to the rising rate of coalescence and aggregation of water droplets. Rajak et al [14] studied the influence of pH, demulsifier dosage, temperature, and sedimentation time on dehydration performance. Accordingly, their result showed that increased sitting time, pH, demulsifier dosage, and temperature broke up emulsions more effectively via improvement in water droplet coalescence.…”

Section: Introductionmentioning

confidence: 99%

Separation Emulsion via Non-Ionic Surfactant: An Optimization

2019

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Achieving emulsion stability in the petroleum industry is a major challenge due to several problems encountered in the oil refining process, such as corrosion in equipment, high-pressure drops in pipelines, and catalyst poisoning in upstream facilities. Thus, several methods are applied for emulsion treatment and chemical treatment using surface-active agents, a fundamental method in the petroleum industry. The present work investigated the performance of a non-ionic surfactant in separating water in a crude oil emulsion via the bottle test technique. Then, a Fractional Factorial Design (2 K−1 ) was used to characterise the effect of significant variables. In particular, a Pareto chart was employed and factors such as demulsifier dosage, toluene concentration, pressure, sitting time, and temperature were investigated. Accordingly, the parameters applied were further analysed using a Central Composite Design (CCD) based on the Response Surface Method (RSM). The experimental results based on analysis of Variance (ANOVA) show that demulsifier dosage, temperature, and sedimentation times were the main variables affecting the dehydration process, with the highest F-values being 564.74, 94.53 and 78.65 respectively. The increase in the surfactant dosage before critical concentration, temperature and sitting time leads to boosting dehydration efficiency. In addition, a mathematical model was established for the variables, with a coefficient of determination value of 0.9688. Finally, numerical optimisation was performed on the variables and the results show that the optimal values are 1000 ppm, 15.5 mL, −400 mmHg, 120 min, and 90 • C, for demulsifier dosage, toluene concentration, pressure, sitting time, and temperature, respectively.

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“…However, some petroleum products where oils need to be separated from emulsfiers, different treatments to eliminate these emulsions (e.g. high concentrations of dispersant) may be required (Rajak et al., 2015, 2016).…”

Section: Resultsmentioning

confidence: 99%

Inter-laboratory calibration of estimated oil equivalent (EOE) concentrations of a water accommodated fraction (WAF) of oil and a chemically enhanced WAF (CEWAF)

Bera

Gold-Bouchot

Passow

et al. 2019

Heliyon

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Chemical characterization of the presence of oil in environmental samples are performed using methods of varying complexity. Extraction of samples with an organic solvent and analysis by fluorescence spectrometry has been shown to be a rapid and effective screening technique for petroleum in the environment. During experiments, rapid analysis of oil by fluorescence provides the opportunity for researchers to modify the experimental conditions in real time. Estimated Oil Equivalents (EOE) relies on the fluorescence measurement of the aromatic compounds to estimate the oil concentration.The present intercalibration study was designed to investigate whether different fluorometer instruments can reliably measure EOE and whether the results are intercomparable. Additionally, the need for extraction of oil compounds into an organic solvent was investigated. Three different fluorometers were used in three different laboratories: a Horiba Aqualog, a Turner Trilogy and a Shimadzu Spectrofluorophotometer RF-1501. Results from these different instruments showed excellent agreement for EOE determinations. A very high correlation was found between the EOE results obtained with Aqualog Horiba and Turner Trilogy (r2 = 0.9999), with no significant differences between the mean EOE results (t-test, p = 0.30), and the Aqualog Horiba and Shimadzu (r2 = 0.995) fluorometers, with no statistically difference between the EOE results obtained by the two instruments (p = 0.40).

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Optimization of separation of oil from oil-in-water emulsion by demulsification using different demulsifiers

Cited by 64 publications

References 16 publications

Magnetically recoverable magnetite-reduced graphene oxide as a demulsifier for surfactant stabilized crude oil-in-water emulsion

Magnetically recoverable magnetite-reduced graphene oxide as a demulsifier for surfactant stabilized crude oil-in-water emulsion

Separation Emulsion via Non-Ionic Surfactant: An Optimization

Inter-laboratory calibration of estimated oil equivalent (EOE) concentrations of a water accommodated fraction (WAF) of oil and a chemically enhanced WAF (CEWAF)

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