The Study on Removing the Salts in Crude Oil via Ethylene Glycol Extraction

Lu, Zhongjiang; Jiang, Jian; Ren, Mannian; Xu, Jinshan; Da, Jianwen; Cao, Fahai

doi:10.1021/ef502453j

Cited by 19 publications

(2 citation statements)

References 27 publications

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“…By comparing Glycerol with other non-ionic surfactants, such as octyl phenol 9-10 ethylene oxide, it is as valuable as any other non-ionic surfactant and has a good surface activity [28]. The non-ionic surfactant is characterised by its capability of dispersing in water and its ability to form micelles in water; its thermal stability and its higher density lends well as a surface active agent in emulsion [29,30]. Glycerol based alcohol is both hydrophobic and lipophilic, making it preferential for diffusing in the interfacial film between the two phases; additionally, the glycerol is a hydrophilic surfactant (water soluble) and this gave it the capacity to make hydrogen bonds with water droplets and force them to link together [26].…”

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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Section: Introductionmentioning

confidence: 99%

Separation Emulsion via Non-Ionic Surfactant: An Optimization

2019

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“…If the metals are not effectively removed, they will cause serious problems, such as the deactivation of the catalyst during the processing of crude oil, 5 the corrosion of the oil refining equipment, 6 and the deterioration of middle and downstream product quality 6,7 . Among them, calcium and iron are mostly present in crude oil in the form of oil‐soluble organic salts, 8 which can be stably chelated with the aromatic hydrocarbon system in crude oil 9 through the π–π chemical bond and are difficult to be removed 10 . Besides, nickels in the form of oil‐soluble porphyrin 11 or non‐porphyrin complex, 12 are mostly present in the resin or asphaltene, 13 which is more difficult to be removed through the traditional electric desalination process 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Comprehensive demetallization of crude oil using spherical polyelectrolyte brushes with submicron polybutadiene latex as a core

Yang

Shen

et al. 2022

J of Applied Polymer Sci

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Stable oil-soluble metals complexes in crude oil bring various problems to the oil processing. In the previous work, four spherical polymer brushes with SiO 2 as a core showed high nickel and calcium removal efficiency, but SiO 2 has high density and smaller specific surface area, greatly limiting the demetallization efficiency. In the present work, spherical polyelectrolyte brushes (PAA@PB) were synthesized by emulsion grafting polymerization.DLS and TEM show that PAA@PB exhibits a uniform spherical core-shell structure with a diameter of 526.3 nm, and TGA exhibits that the grafting rate is 20.6%. The demetallization rate and selectivity of PAA@PB were investigated with varying concentration, electrical desalination conditions, pH value, and NaCl concentration. In contrast, the demetallization efficiency of PAA@PB is much greater than that of PAA@SiO 2 -G. Notably, PAA@PB exhibits excellent nickel removal efficiency, but a little more selective for iron.The optimal removal rate for calcium, nickel, and iron are 55.3%, 52.6%, and 46.1%, respectively. Compared with P4VP@SiO 2 -G, which possesses the highest demetallization efficiency among four polymer brushes with SiO 2 , to achieve the same nickel removal rate, the concentration of PAA@PB is almost eight times less than that of P4VP@SiO 2 -G. Consequently, PAA@PB has great potential as an excellent comprehensive demetallization agent.

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