The effect of adding surfactant to the treating acid on the chemical properties of an acid-treated coal

Xie, Ju; Guanhua, Ni; Xie, Heping; Li, Shang; Sun, Qing; Dong, Kai

doi:10.1016/j.powtec.2019.08.039

Cited by 99 publications

(28 citation statements)

References 47 publications

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“…Every individual peak corresponds to the vibration of a relevant functional group. As shown in Figure a, the peaks at 1012 and 1035 cm –1 are attributed to the vibration of Si–O–Si groups, the peaks at 1089 and 1160 cm –1 are classified as the vibrations of C–O–C and C–O groups, , and the peak at 1271 cm –1 belongs to the vibration of Ar–OH groups. − As shown in Figure b, the peak at 1600 cm –1 is the vibration of the skeleton for CC groups, the peaks at 1630 and 1660 cm –1 belong to the vibration of CO groups, and the peak at 1700 cm –1 is attributed to the vibration of COOH groups. Meanwhile, the bond region of 3000–3600 cm –1 for the hydroxyl groups is also integrated to obtain the areas of the hydroxyl groups.…”

Section: Results and Discussionmentioning

confidence: 98%

“…The region in 1000–1800 cm –1 presents the oxygen-containing structure and the region in 3000–3600 cm –1 shows the hydroxyl structure . In the range of 1000–1800, 1000–1100 cm –1 shows the vibration of Si–O–Si groups, 1100–1300 cm –1 indicates the vibration of C–O groups for ester, alcohol, and ether, and 1600–1800 cm –1 shows the stretching vibrations of CC, CO, and COOH groups of the skeleton for CC, carbonyl, and carboxyl. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…FTIR technology can be used to identify various chemical functional groups by determining the vibration of chemical bonds. Meanwhile, it can be applied to quantitatively describe the content of chemical functional groups through a Peakfit software. , Meanwhile, AFM technology can be used to obtain the surface morphology and calculate the surface roughness. , The contact angle test can be utilized to describe the wetting characteristic of the surface. Thus, in this study, contact angle tests, Fourier-transform infrared spectroscopy (FTIR) measurements, and atomic force microscope (AFM) experiments were combined to figure out the mechanism of wettability alteration in tight sandstones subjected to DC voltage treatment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Role of DC Voltage in the Wettability Alteration in Tight Sandstones

et al. 2020

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The usage of direct current (DC) voltage has enormous potential for oil fields due to the effect of wettability alteration. However, the unclear mechanism of the wettability alteration has limited the application of this technology to oil fields. In this study, chemical and physical methods including contact angle tests, Fourier-transform infrared spectroscopy (FTIR) measurements, and atomic force microscope (AFM) experiments were combined to investigate the wettability alteration mechanism for tight sandstones subjected to DC voltage treatment. From the view of a chemical factor, FTIR results show that DC voltage decreases the number of Si–O–Si, C–O–C, C–O, and COOH groups, while it also increases the number of CO and OH groups. The changes in molecular groups further improve the water-wetting property of tight sandstones. On the other hand, in a physical way, AFM results indicate that DC voltage improves the roughness of the rock surface. At the same time, the wetting state transfers from the Cassie–Baxter to the Wenzel. This increases the contact area of the solid–liquid interface. The augment of roughness and the transfer of the wetting state improve the water-wetting property of tight sandstones. By comparing the influences of both chemical and physical factors on wettability, it is concluded that although roughness indeed affects the wettability, chemical factors play a dominant role in determining the wettability. Achievements in this study can help researchers and engineers better understand the mechanism of wettability alteration and further accelerate the development of tight sandstones with DC voltage-related technology.

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Section: Results and Discussionmentioning

confidence: 98%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Role of DC Voltage in the Wettability Alteration in Tight Sandstones

et al. 2020

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“…is research can provide a theoretical basis for shotcrete in mine. High quality wet-mix shotcrete with PET fiber can effectively reduce mine disasters, such as dust and roof accidents [78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95].…”

Section: Relationship Between Shootability and Mechanicalmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

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“…Coalbed methane (CBM) refers to the unconventional natural gas deposited in coalbeds. − The combustion of CBM produces no ash, releases no toxins, and emits less carbon dioxide than the combustion of coal and oil. , As a result, CBM will remain an environmentally friendly component in the energy portfolio over the next decades. , …”

Section: Introductionmentioning

confidence: 99%

Microwave-Induced Microstructure Evolution of Coal and Its Effects on the Methane Adsorption Characteristic

Shi

et al. 2021

Energy Fuels

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Coalbed methane (CBM) reservoirs usually require stimulation to enhance the permeability. Characterized by the transformation of electromagnetic energy into thermal energy, microwave heating may be a promising CBM stimulation approach. In this work, the microstructure evolution of coal affected by microwave heating was investigated by Fourier transform infrared spectroscopy (FTIR), low-temperature nitrogen adsorption (LT-N2GA), and scanning electron microscopy (SEM). In addition, the methane adsorption property of coal was evaluated using a high-pressure adsorption instrument. The results indicate that microwave heating would cause the pyrolysis of ether groups, oxygen-containing groups, and aliphatic hydrocarbon in coal. After microwave treatment, the volume and connectivity between mesopores and micropores increase. The decrease in the methane adsorbability of coal may be attributed to the reduction of the methane adsorption site induced by microwave heating. The outcome of this study implies that microwave heating can be used to promote CBM recovery.

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The effect of adding surfactant to the treating acid on the chemical properties of an acid-treated coal

Cited by 99 publications

References 47 publications

Experimental Investigation of the Role of DC Voltage in the Wettability Alteration in Tight Sandstones

Experimental Investigation of the Role of DC Voltage in the Wettability Alteration in Tight Sandstones

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Microwave-Induced Microstructure Evolution of Coal and Its Effects on the Methane Adsorption Characteristic

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