Composition characteristics of siloxane derived waste lubricating oil and its effect on low-rank coal flotation

Yang, Zhe; Liao, Yinfei; An, Maoyan; Ren, Hourui; Hao, Xiaodong; Song, Xingwei; Liu, Zechen

doi:10.1016/j.fuel.2021.121555

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…This discovery suggests that engine combustion may be a potential and widespread source of methylsiloxanes, which has been overlooked thus far. Methylsiloxanes emitted by engine combustion likely have their origin in PDMS contained in fuel oils or lubricating oils, where they serve as antifoam additives. − The high thermal resistance of PDMS implies that fragments and unburned PDMS can potentially be emitted by vehicle engines. Furthermore, the combustion of PDMS may result in smaller fragments, as well as oxidized and hydrolyzed products with various molecular sizes in the emitted gases and particles.…”

Section: Introductionmentioning

confidence: 99%

Methylsiloxanes from Vehicle Emissions Detected in Aerosol Particles

Yao,

Holzinger,

Materić

et al. 2023

Environ. Sci. Technol.

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Methylsiloxanes have gained growing attention as emerging pollutants due to their toxicity to organisms. As man-made chemicals with no natural source, most research to date has focused on volatile methylsiloxanes from personal care or household products and industrial processes. Here, we show that methylsiloxanes can be found in primary aerosol particles emitted by vehicles based on aerosol samples collected in two tunnels in São Paulo, Brazil. The aerosol samples were analyzed with thermal desorption-proton transfer reaction-mass spectrometry (TD-PTR-MS), and methylsiloxanes were identified and quantified in the mass spectra based on the natural abundance of silicon isotopes. Various methylsiloxanes and derivatives were found in aerosol particles from both tunnels. The concentrations of methylsiloxanes and derivatives ranged 37.7–377 ng m –3 , and the relative fractions in organic aerosols were 0.78–1.9%. The concentrations of methylsiloxanes exhibited a significant correlation with both unburned lubricating oils and organic aerosol mass. The emission factors of methylsiloxanes averaged 1.16 ± 0.59 mg kg –1 of burned fuel for light-duty vehicles and 1.53 ± 0.37 mg kg –1 for heavy-duty vehicles. Global annual emissions of methylsiloxanes in vehicle-emitted aerosols were estimated to range from 0.0035 to 0.0060 Tg, underscoring the significant yet largely unknown potential for health and climate impacts.

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Section: Introductionmentioning

confidence: 99%

Methylsiloxanes from Vehicle Emissions Detected in Aerosol Particles

Yao,

Holzinger,

Materić

et al. 2023

Environ. Sci. Technol.

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“…The adsorption of WSMO can mask the oxygen-containing groups on the surface of low-rank coal, thus inhibiting the formation of hydrogen bonds between the oxygen-containing groups and water molecules. The results show that a higher yield of concentrate and lower ash content can be obtained by WSMO flotation …”

Section: Selection and Blending Of Green Flotation Reagentsmentioning

confidence: 92%

“…The results show that a higher yield of concentrate and lower ash content can be obtained by WSMO flotation. 31 The catering industry generates a large amount of used cooking oil each year with decompression difficulties. WCO containing high alkyl and oxygen-containing groups can be a potential alternative to conventional collectors in low-rank/ oxidized coal flotation.…”

Section: Renewable Collector Replacing Conventionalmentioning

confidence: 99%

Advances and Perspectives of Green and Sustainable Flotation of Low-Rank/Oxidized Coal: A Review

Gao,

Li,

Lyu

et al. 2024

Energy Fuels

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Flotation is a mature technology for the commercial processing of fine coals. However, due to the difficult flotation characteristics of low-rank/oxidized coals, conventional flotation is often inefficient, resulting in massive low-rank/oxidized coal resources not being utilized efficiently and thus going to waste. In addition, the large quantities of conventional oil collectors used to meet satisfactory flotation objectives adversely affect the environment. Under the current huge energy demand and environmental pressures, the efficient, green, and sustainable upgrading of low-rank/oxidized coals is an urgent need for the coal industry. In recent years, a number of attractive techniques to improve separation accuracy have been proposed. However, few ideas have been reported about the application of different types of technologies throughout the flotation process which can improve the flotation process objectives and thus reduce the formation of contaminants. In order to explore an ideal flotation technology for low-rank/oxidized coals, this paper provides a systematic review of the research progress in low-rank/oxidized coal flotation, including the updates in three aspects: the development of pretreatment processes, selection and combination of flotation reagents, as well as optimization of flotation conditions. The synergy of multiple technologies, that maximize flotation objectives and thus reduce the dosage of non-renewable collectors, is the key to achieving green separation of low-rank/oxidized coals. According to the advantages of existing technologies, a green and sustainable flotation process for low-rank/oxidized coal combining pretreatment process, green flotation reagents, and flotation optimization process is proposed to obtain positive process objectives while maximizing economic savings and environmental friendliness.

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“…One of the most significant contributors to waste oil products on a global scale is Waste Motor Oil (WMO). With global lubricating oil consumption reaching 24 million tons in 2014 and surging to 48 million tons by 2019 [8], [9], the gradual degradation of lubricating oil over time and its transition into waste oil pose substantial challenges for the resource recycling industry. This issue extends to environmental concerns, as WMO is categorized as hazardous waste with the potential to contaminate water, soil, and the atmosphere [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Optimizing energy harvesting from waste motor oil through steam reforming: A path to efficient combustion and emissions reduction

Waluyo,

Pujiarto,

Ardana

et al. 2023

Mech. Eng. for Soc. and Ind.

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Waste Motor Oil (WMO) is a hazardous waste material with the potential to contaminate water, soil, and the atmosphere. The management and engineering of WMO have become imperative in modern society for both resource utilization and environmental protection. Maximizing the energy content of WMO poses a significant challenge for researchers, to solve environmentally friendly solutions. Direct combustion of WMO often results in incomplete combustion and elevated CO emissions. Therefore, this research aims to optimize the harnessing of WMO's energy potential through a furnace equipped with steam injection. The steam is generated by utilizing the heat energy produced during the WMO heating process. Our study demonstrates that steam injection in the WMO furnace is an effective method for maximizing energy content while simultaneously reducing CO emissions.

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Composition characteristics of siloxane derived waste lubricating oil and its effect on low-rank coal flotation

Cited by 14 publications

References 41 publications

Methylsiloxanes from Vehicle Emissions Detected in Aerosol Particles

Methylsiloxanes from Vehicle Emissions Detected in Aerosol Particles

Advances and Perspectives of Green and Sustainable Flotation of Low-Rank/Oxidized Coal: A Review

Optimizing energy harvesting from waste motor oil through steam reforming: A path to efficient combustion and emissions reduction

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