Showing papers by "Beijing Institute of Petrochemical Technology published in 2023"
TL;DR: In this article , carbon nanotubes (CNTs) supported ultrasmall PtPdRh nanoparticles were synthesized with polyallylamine hydrochloride and hexadecyl trimethyl ammonium bromide for EOR.
2 citations
TL;DR: In this article , a series of mesoporous TiO2-doped with polyoxometalates [H3PMo12O40] composites were fabricated through a convenient electrospinning/calcination and hydrothermal methods.
2 citations
TL;DR: In this article , the polystyrene/polyacrylamide (PS/PAM) core-shell microspheres were successfully prepared by the microfluidizer-assistant emulsification template method.
Abstract: Abstract Polyacrylamide and its derivatives are commonly used functional polymers to enhance oil recovery in a water-flooding oilfield. By using its hydrophilic amide group to swell and gel in stratum water, it can plug the fractures and pore throats of underground. In order to improve the strength of polyacrylamide material, the polystyrene/polyacrylamide (PS/PAM) core-shell microspheres were successfully prepared by the microfluidizer-assistant emulsification template method. The influences of different preparation conditions, such as the different types and concentrations of surfactants, organic phase and oil/water ratios, on the morphology, diameter, and distribution of corresponding PS core have been systematically studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and laser light scattering analysis (LLS). Moreover, by the integration of porous meshes onto both inlet and outlet of the interaction chamber, the resultant polymer microspheres could be tuned larger due to the dual homogenization. Our procedure can provide a simple and general method to modulate the diameter of the polymer microspheres in the range of 30 nm to 3 μm with a narrow polydispersity index (PDI) of <0.2. The PS/PAM core-shell microspheres exhibited good water plugging performance.
TL;DR: In this article , a printing-ready topology optimization method was proposed, whereby the topological designs can be directly exported in the format of a printing ready G-code, which saves the postprocessing efforts of stereo lithograph (STL) model generation, model slicing, and tool path planning.
Abstract: Additive manufacturing-oriented topology optimization features in the extreme geometric complexity that magnifies the product functional performance. However, the increased geometric complexity makes postprocessing of the designs technically nontrivial and sometimes inefficient because of too many structural details. To address this issue, this article presents a novel printing-ready topology optimization method whereby the topological designs can be directly exported in the format of a printing-ready G-code, which saves the postprocessing efforts of stereo lithograph (STL) model generation, model slicing, and tool path planning. More importantly, the slicing and tool path information can be tracked all the time during optimization to facilitate the evaluation of the tool path-related material constitutive model, for example, the fiber-reinforced composites, so as to improve the numerical analysis accuracy and the design result optimality. Finally, three case studies are performed to test the postprocessing efficiency of the printing-ready approach and the multi-scale design case, which demonstrates the outstanding high efficiency characteristic of the proposed approach.
TL;DR: In this paper , a low-pressure-loss dynamic hydrocyclone (LPDH) was designed to drive liquid into circumferential rotational flow and produce axial pressure.
Abstract: Effective pre-dehydration is achieved to stabilize and improve oil production in high water cut oil fields. In order to reduce the pressure loss during the pre-dewatering process, a low-pressure-loss dynamic hydrocyclone (LPDH) was developed. And its swirler vane was designed which can not only drive liquid into circumferential rotational flow but also produce axial pressure. The axial pressure will compensate for the separation process pressure loss. The key parameters that affected the axial pressure were studied, the relative motion between the fluid and the vane was analyzed, and a pre-dehydration LPDH was designed (processing capacity is 1.0 m3/h). The changes in the separation efficiency and axial pressure of the LPDH with the operational and physical parameters were studied by the computational fluid dynamics (CFD) numerical simulation method. The results revealed that the pressure is increased during rotation-starting, and the pressure loss of LPDH was lower than the dynamic and compound hydrocyclones. Notably, low shear stress was generated using the designed vane when the fluid started rotating, and the separation efficiency increased under these conditions. When the speed of rotation of the swirler is 167.5 rad/s, the separation efficiency of the LPDH is greater than 99.8%.
TL;DR: In this paper , a CFD solver was used as the solver to optimize the ground flare structure and reduce the concentration of soot emissions, and the temperature and soot volume fraction (SVF) of air assisted ground flare under different combustion hole sizes.
Abstract: As the last guarantee for safe production of the plant, industrial flare is also an essential environmental protection measure to reduce environmental pollution. According to the mechanism of soot formation, the main limiting factors in the process of soot generation and oxidation are identified. The CFD software is used as the solver to optimize the ground flare structure and reduce the concentration of soot emissions. We chose PDF model to calculate turbulent combustion and Moss-Brookes model to predict soot formation. Using C3H6 as fuel and air as oxidant, we calculated the temperature and soot volume fraction (SVF) of air assisted ground flare under different combustion hole sizes. Combined with soot formation mechanism, we find that on the premise of ensuring the fixed air flow, properly reducing the size of combustion supporting holes can accelerate the flame propagation speed, shorten the flame height, and promote the formation and oxidation of soot. Accurate air distribution can prevent soot accumulation near the flare burner, thus extending the service life.
TL;DR: In this paper , the effects of high temperature, injection rate, and fracture width on the pressure response and plugging efficiency of the fracture were clarified by establishing an improved experimental system for the evaluation of temporary plugging performance at high temperature.
TL;DR: In this article , a single-cell approach integrating D2O-labeled Raman spectroscopy, advanced multivariate analysis, and genotypic profiling is presented to in situ track physiological evolution trajectory toward resistance.
Abstract: Understanding evolution of antibiotic resistance is vital for containing its global spread. Yet our ability to in situ track highly heterogeneous and dynamic evolution is very limited. Here, we present a new single-cell approach integrating D2O-labeled Raman spectroscopy, advanced multivariate analysis, and genotypic profiling to in situ track physiological evolution trajectory toward resistance. Physiological diversification of individual cells from isogenic population with cyclic ampicillin treatment is captured. Advanced multivariate analysis of spectral changes classifies all individual cells into four subsets of sensitive, intrinsic tolerant, evolved tolerant and resistant. Remarkably, their dynamic shifts with evolution are depicted and spectral markers of each state are identified. Genotypic analysis validates the phenotypic shift and provides insights into the underlying genetic basis. The new platform advances rapid phenotyping resistance evolution and guides evolution control.
TL;DR: In this paper , a microspherical activated carbon/Mn3O4/SrTiO3 composite photocatalyst with high catalytic activity was synthesized using sol-gel and chemical precipitation methods.
Abstract: BACKGROUND With the development of the textile and dye industry, a large amount of dye wastewater has been discharged. Semiconductor photocatalysis has been widely used in the treatment of environmental pollution, so it is very important to study efficient, nontoxic and stable photocatalysts. RESULTS In this study, a microspherical activated carbon/Mn3O4/SrTiO3 composite photocatalyst with high catalytic activity was synthesized using sol–gel and chemical precipitation methods. The photocatalyst was characterized through X-ray diffraction, scanning and transmission electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, Electrochemical impedance spectroscopy, electron paramagnetic resonance spectroscopy and photocurrent measurements, and the effects of the initial methylene blue (MB) concentration and pH on the catalytic performance of the photocatalyst were investigated. The results revealed that the MC/Mn3O4/SrTiO3 composite has large light absorbance, and it can effectively inhibit photoinduced electron–hole pair recombination. The catalyst exhibited high photocatalytic degradation activity, and the degradation efficiency of MB at 300 ppm and pH 7 reached 99% after 80 min of UV light irradiation. The photodegradation process conformed to the pseudo-first-order kinetic model. Recyclability experiments showed that MC/Mn3O4/SrTiO3 composite has high stability, and the degradation rate of MB is > 70% after three repeat uses. CONCLUSIONS This work provides a new method for finding low-cost, high-performance materials that can be modified and put into industrial use. © 2023 Society of Chemical Industry (SCI).
TL;DR: In this article , the solubility, diffusivity, and permeability of hydrogen in PE, PVC and PVDF amorphous polymers are investigated and compared by molecular dynamics simulations at 270-310 K and 0.1-0.7 MPa, providing guidance for the construction of nonmetallic hydrogen transportation pipes.
Abstract: The nonmetallic pipes can effectively avoid the hydrogen embrittlement of metal pipes when transporting hydrogen. However, due to the characters of the nonmetal materials, there will be a large degree of gas permeation when conveying hydrogen by nonmetallic pipes. To select suitable nonmetal pipe materials, the solubility, diffusivity, and permeability of hydrogen in PE, PVC and PVDF amorphous polymers are investigated and compared by molecular dynamics simulations at 270–310 K and 0.1–0.7 MPa, providing guidance for the construction of nonmetallic hydrogen transportation pipes. Simulation results indicate that the solubility coefficients of hydrogen in PE and PVDF rise with the increasing temperature, but show an opposite trend in PVC. Both the diffusion and permeability coefficients increase with the rise of temperature. In a small range of pressure variation, the influence of pressure on diffusion and permeation characteristics is ignorable. Among the three studied amorphous polymers, the permeability coefficient of hydrogen in PE is the largest and that in PVDF is the smallest. In addition, the diffusion of hydrogen molecules in the polymer conforms to the hopping mechanism.