Application of hydrophobic ionic liquid [Bmmim][PF6] in solvent extraction for oily sludge

Many industries discharge oil-in-water emulsion in the waste stream, often above the permissible limit causing serious environmental hazards. Porous media such as membrane and coalescence beds are employed to treat oily wastewater. A coalescence bed filter consists of either fibrous or granular packing and is used for removing larger oil droplets less than 100 μm from secondary emulsions. Fibrous media have higher porosities and specific surface areas than coarse granular media and hence give higher oil removal efficiency. To design an efficient fibrous coalescence bed filter for treating industrial discharge, understanding the mechanism of oil separation is important. This involves the surface wettability of fibers relating to surface chemistry and roughness. Further, fiber diameter, filter bed’s height, porosity, and pore size in relation to the oil droplet size and throughput and influent oil concentration are interactive parameters that affect the efficiency of coalescence. The performance of coalescence filtration is evaluated by analyzing the oil concentrations and D50 droplet sizes in the influent and effluent. In this article, the above-mentioned subjects are comprehensively reviewed from the reported research works, which highlights the complex nature of fibrous coalescence filtration.

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“…15 Therefore, chemical industries involved in handling wastewater must have safe disposal of oil sludge and various oil treatment techniques. 16…”

Section: Food Processing Industriesmentioning

confidence: 99%

Fibrous coalescence filtration in treating oily wastewater: A review

Singh

Mukhopadhyay

Rengasamy

2021

Journal of Industrial Textiles

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“…ILs are widely attractive due to their unique properties, including variable styles of anions and cations, good thermal and chemical stability, low melting point, low vapor pressure, good recycling, larger interface contact areas with vapors, and so on. According to their unique advantages, ILs are particularly suitable as promising adsorbents in various fields 27‐32 . To date, ILs, such as 1‐butyl‐3‐methylimidazolium aspartic acid [BMIM][ASP], 31 1‐butyl‐3‐methylimidazolium glycinate ([BMIM][Gly]), 33 and 1‐hexyl‐3‐methylimidazolium hexafluorophosphate [HMIM][PF 6 ], 34 have been explored in the research of CO 2 absorption.…”

Section: Introductionmentioning

confidence: 99%

“…According to their unique advantages, ILs are particularly suitable as promising adsorbents in various fields. [27][28][29][30][31][32] 32 To date, ILs, such as 1-butyl-3-methylimidazolium aspartic acid [BMIM][ASP], 31 1-butyl-3-methylimidazolium glycinate ([BMIM] [Gly]), 33 and 1-hexyl-3-methylimidazolium hexafluorophosphate [HMIM][PF 6 ], 34 have been explored in the research of CO 2 absorption. The higher absorption capacity of imidazolium-based ILs was attributed to the combined chemical interactions of CO 2 with both the cation and the anion.…”

Section: Introductionmentioning

confidence: 99%

Study on functionalized acidic imidazolium‐based ionic liquids as effective adsorbents for HCHO storage

Guo

Ren

Jiang

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: Recent works have shown how to develop methods with specific economic and environmental aspects; this is the main motivation for research on energy efficient processes and environmentally friendly materials for formaldehyde (HCHO) storage. One specific goal is to improve the adsorption capacity for HCHO by constructing closely contacted connections with absorbents.RESULTS: In this study, two ionic liquids (ILs), 1-methylimidazole hydrogen sulfate [MIM][HSO 4 ] and Imidazole hydrogen sulfate [IM][HSO4] as newly developed absorbents for HCHO storage are applied for the first time. Based on thermogravimetric analysis (TGA) and nuclear magnetic resonance (NMR) results, it is concluded that their exceptional capacity for storage of HCHO is 31.07 and 34.60 (g formaldehyde)Á(mol ionic liquid) −1 , respectively. In addition, to study the renewability of HCHO, the decomposition rates of the reaction products (as a function of decomposition time and decomposition temperature) were measured. The optimal kinetic model was selected to satisfy the formation and decomposition processes of the products. Thereafter, the activation energy (E), pre-finger factor (A), decomposition rate constant of the decomposition reaction, and the rate constant of the reaction were determined. NMR results confirmed that the higher storage capacity of HCHO in [MIM][HSO 4 ] and [IM][HSO 4 ] is mostly attributed to the stronger covalent bonds between the ionic liquids (ILs) and HCHO.CONCLUSION: These ILs are, thus, promising candidates as adsorbents for the design of air depollution processes. This study may provide new insights into the use of ILs for storage of HCHO for low-cost, high-performance, and environmentally benign adsorbents for indoor air purification.

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Approaches Involved in the Treatment and Disposal of Petroleum Refinery Sludge

Singha,

Deka

2024

Environmental Engineering and Waste Management

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Application of hydrophobic ionic liquid [Bmmim][PF6] in solvent extraction for oily sludge

Cited by 15 publications

References 22 publications

Fibrous coalescence filtration in treating oily wastewater: A review

Fibrous coalescence filtration in treating oily wastewater: A review

Study on functionalized acidic imidazolium‐based ionic liquids as effective adsorbents for HCHO storage

Approaches Involved in the Treatment and Disposal of Petroleum Refinery Sludge

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