Wetting Mechanism and Experimental Study of Synergistic Wetting of Bituminous Coal with SDS and APG1214

Sun, Lijuan; Ge, Shaocheng; Jing, Deji; Liu, Shuo; Chen, Xi

doi:10.1021/acsomega.1c05422

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…Based on this, the Gemini surfactant Surfynol 465 with low foaming property and high hydrophilicity was used as the main raw material . To make the moist dust particles continue to absorb water in the air and prevent the occurrence of dust re-entrainment, the alkyl glycoside APG1214 with good surface activity and compound performance and sucrose with strong hygroscopicity were selected as auxiliary materials. , …”

Section: Methodsmentioning

confidence: 99%

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Study on Multi-Factor Optimization and Application for Water Mist of a Wetting Dust Suppressant

Tang

Song

et al. 2022

ACS Omega

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Aiming at the problem of low efficiency of capturing respirable and hydrophobic dust in water mist dust removal technology, a chemical dust suppression method is adopted. Based on the research idea of improving the wetting efficiency of water mist, prolonging the droplet retention time, and improving the contact opportunity with dust, the experiments of dust sedimentation time, solution spreading area, and water loss rate are selected to evaluate the wetting efficiency and anti-evaporation performance of dust suppression water mist. Considering the special double-chain structure of the Gemini surfactant and its high wettability, it is preferred as the main dust suppression component. Based on the indoor experimental data, the optimized formula of the composite wet water mist dust suppressant was obtained by CCD-RSM(central composite design-response surface methodology). The comparison of indoor experimental data shows that the sedimentation time of the dust sample in the water mist dust suppressant is 5.0 times faster than that of pure water, the spreading area of the dust suppressant solution is 1.8 times that of pure water, and the water loss rate of the dust sample treated by the dust suppressant is 70% that of pure water. The field investigation results show that compared with pure water mist, the dust removal rates of the Gemini wetting dust suppressant for respirable dust and total dust are 90.3 and 71.1%, respectively, which are 10.5 and 22.5% higher than that of pure water mist. It can be proved that improving the wetting efficiency and anti-evaporation performance of spray mist will increase the dust removal efficiency.

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Section: Methodsmentioning

confidence: 99%

“…14 To make the moist dust particles continue to absorb water in the air and prevent the occurrence of dust reentrainment, the alkyl glycoside APG1214 with good surface activity and compound performance and sucrose with strong hygroscopicity were selected as auxiliary materials. 15,16 3.2. Dust Samples.…”

Section: Dust Suppression Componentsmentioning

confidence: 99%

Study on Multi-Factor Optimization and Application for Water Mist of a Wetting Dust Suppressant

Tang

Song

et al. 2022

ACS Omega

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“…The tail chains of the two surfactants were intertwined, the oxygen atoms in the −SO 3 − of the headgroup formed hydrogen bonds with the hydrogen atoms of water, and the normal angle between the tail chain of SDBS and the oil−water interface was small. Sun et al 10 found that the interaction between SDS and APG1214 and coal surface was greater than that between water and coal. When the ratio was 1:3 and the total concentration was 0.7%, the combined surfactant had the best wettability on the coal surface.…”

Section: ■ Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of the Effects of Complex Surfactants on Oil–Water Interaction and Aggregation Characteristics at the Interface

Xian,

Ye,

Tang

et al. 2023

Langmuir

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In response to the problem of complex interaction between oil and water in the oil−water interface, especially heavy oil and water, this study investigated the effects of complex surfactants on the interaction of two phases and their aggregation characteristics by molecular dynamics simulation. The results showed that increasing the content of sodium lauryl polyether carboxylate (AEC-9Na) was beneficial to the coordination between it and alkyl glycoside (APG-10), improved the interfacial activity, and enhanced the interfacial stability of the composite system, and the best effect was achieved when AEC-9Na:APG-10 = 8:2. The thickness of the oil and water film on the oil−water interface was irregular. When the concentration of AEC-9Na was lower than that of APG-10, the total thickness of the interfacial film (t total ) first increased. When the content of AEC-9Na is higher, a large number of sodium ions were adsorbed near the −COO − group of AEC-9Na, which will polarize out of the hydration layer structure and attract water molecules from the second hydration layer on the heavy oil surface to the first hydration layer through electrostatic interaction. Then, the thickness of the interface film was compressed, and the interface film was reduced. When the ratio increased to 10:0, the oil and water phase competed to adsorb surfactant molecules, and the headgroup tended to lay on the interface. Moreover, the hydrophilicity of the surfactant layer was weakened, and the thickness of the water film decreased. The distribution of surfactant was looser than 8:2, the light components of heavy oil molecules (saturated and aromatic hydrocarbons) entered the gap between surfactants in large quantities, and the hydrophobic tail chain tended to be laid on the oil−water interface. The oleophilicity of the surfactant layer increased, and the thickness of the oil film remarkably increased, so the total thickness of the interface film increased again.

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“…Experimental studies aimed at improving the wettability of coal seams and gas extraction efficiency concentrated on water injection and gas injection displacement. Research on water injection focused on the use of surfactants. − Surfactants are the main wetting agents in improving wettability, and surface tension is a key parameter for their effectiveness. − Jiang et al found that OP-10 surfactant solutions had the best effect on improving coal wettability based on surface tension and contact angle measurements of different wetting agents. , Several studies have explored the effect of wetting agents in different proportions or combined with other materials to improve the wettability of coal seams. ,− For instance, Zou et al added water-based SiO 2 nanofluids to the wetting agent solution and proposed a water injection method for coal seam improvement. , Molecular simulation software has been employed by some scholars to investigate the mechanism of surfactant effect on enhancing coal seam wettability. ,, In addition, the COMSOL simulation software was used to develop a coupled damage model during water injection to increase gas extraction rates. , Studies on gas injection displacement for improving gas extraction rates can be categorized into two types: using gases with strong adsorption capacity or gases that can break the dynamic balance of coal seam gas. − CO 2 -enhanced coalbed methane (CO 2 -ECBM) technology is essential to ensure energy security and achieve the “dual carbon” goal. This technology is crucial for achieving the low-carbon, clean, and efficient utilization of coal-based fossil energy.…”

Section: Introductionmentioning

confidence: 99%

Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants

Liu,

Li,

Zheng

et al. 2023

ACS Omega

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This paper investigates the unclear influence mechanism of the surfactant effect on improving coal seam wettability and CO2-enhanced coalbed methane technology to enhance the gas extraction efficiency in some coal mines under highly mineralized environments in China. Specifically, the microinfluence mechanism of the coupling effect of nonionic surfactant OP-10 and highly mineralized coal samples under special treatment on the wettability of coal seam is examined. By measuring the contact angle and surface tension of the samples, it is confirmed that high mineralization can limit the effect of surfactants on improving the wettability of coal seams to a certain point. Infrared spectroscopy and X-ray diffraction measurements were conducted on the samples under coupling conditions. It is found that high mineralization impedes the effectiveness of surfactants in enhancing the wettability of coal seams. The surfactants interact with coal samples at the functional group level, producing new hydrophilic functional groups and increasing the content of kaolin with strong hydrophilic properties, thereby increasing the wettability of coal seams. However, these hydrophilic functional groups disappear under coupling conditions and hydrophobic functional groups are produced. Additionally, high mineralization inhibits the effect of surfactants on the phase composition of coal samples. The findings of this research provide a theoretical basis for water injection of highly mineralized coal seams and methane replacement recovery by carbon dioxide technology, promoting the practical application of water injection and gas injection displacement of coal seams.

show abstract

Wetting Mechanism and Experimental Study of Synergistic Wetting of Bituminous Coal with SDS and APG1214

Cited by 12 publications

References 30 publications

Study on Multi-Factor Optimization and Application for Water Mist of a Wetting Dust Suppressant

Study on Multi-Factor Optimization and Application for Water Mist of a Wetting Dust Suppressant

Molecular Dynamics Simulation of the Effects of Complex Surfactants on Oil–Water Interaction and Aggregation Characteristics at the Interface

Wettability Characteristics of Low-Rank Coals Under the Coupling Effect of High Mineralization and Surfactants

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