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Chinese Journal of Chemical Engineering 2017年第2期25卷 223-231页

作者： Shiguang zhang Lei Li Youzhi Liu qiaoling zhang Shanxi Province Key Laboratory of Higee-Orienred Chemical Engineering North University of ChinaTaiyuan 030051China

Pickering emulsions stabilized by salicylic acid and arginine modified titanium dioxide （TiO2-SA-Arg） nanopar- tides were prepared in this study for photocatalytic degradation of nitrobenzene in a rotating annular reactor, and the effects of various design parameters of the rotating annular reactor, initial nitrobenzene concentration, catalyst amount, and solution pH on the degradation rate of nitrobenzene were investigated. Meanwhile, the degradation mechanism of nitrobenzene was proposed. The results show that increasing the aeration rate, the rotational speed, and light intensity results in a higher photocatalytic degradation rate of nitrobenzene owing to the effective clearance of electrons and a high quantity of oxidative free radicals. The degradation of nitroben- zene in the rotating annular reactor follows the pseudo first-order kinetics, but it is not well described by the Langmuir-Hinshdwood equation. Aeration has a significant effect on the photocatalytic degradation pathway of nitrobenzene. Because nitrobenzene can undergo reduction reaction as electron acceptors and oxidative deg- radation initiated by hydroxyl free radicals, the photocatalytic degradation of nitrobenzene follows the reduction mechanism under no aeration, but the oxidation mechanism under aeration.

关键词： NanoparticlesEmulsionsWaste waterWaste treatmentRenewable energyReaction kinetics

Optimal harvest of an interval model of carbon sink fisheries with multi-trophic levels

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International Journal of Biomathematics 2016年第3期9卷 21-38页

作者： Yi zhang qiaoling zhang Lichun Zhao School of Science Shenyang University of Technology Shenyang 110870 P. R. China Nanjing University of Science and Technology Nanjing 210094 P. R. China College of Mathematics and Information ScienceAnshan Normal University Anshan 114007 P. R. China

Considering the uncertainty of kelp-abalone-sea cucumber population, an interval model of carbon sink fisheries with multi-trophic levels is proposed. The equilibria of the model are identified and the corresponding stabilities are discussed. And the existence of bionomic equilibrium of the model is investigated. Next the optimal controller is designed to obtain the optimal harvest using Pontryagin＇s maximum principle. Numerical simulations are carried to prove the results.

关键词： Carbon sink fisheries multi-trophic levels optimal harvest interval model.

Octane compositions in sulfuric acid catalyzed isobutane/butene alkylation products:experimental and quantum chemistry studies

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1229-1242页

作者： Lina Liang Youzhi Liu Weizhou Jiao qiaoling zhang Chao zhang Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan030051China

Octanes in alkylation products obtained from industrial alkylation were studied by batch *** than eight octane isomers were identified and quantified by gas chromatography-mass *** on a classic carbenium ion mechanism,the carbocation transition states in concentrated sulfuric acid catalyzed alkylation were investigated using quantum-chemical simulations and predicted the concentration and octane isomerization products including trimethylpentane and dimethylhexane as well as the formation of heavier compounds that resulted from the oligomerization of octane and *** agreement between model calculations and experimental data was quite *** results indicated that composition and content of trimethylpentanes in the alkylation products were 2,2,4-trimethylpentane>2,3,3-trimethylpentane>2,3,4-trimethylpentane>2,2,3-trimethylpentane whether the 2-butene or i-butene acts as *** compounds in the alkylate were primarily formed by the oligomerization of dimethylhexane with ***,the carbocation transition state models developed in this work will be useful for understanding the product distributions of octane in alkylation products.

关键词： sulfuric acid catalyzed alkylation carbocation reaction transition state octane compositions

A turbulent mass diffusivity model for analyzing the mixing characteristics in an impinging stream-rotating packed bed

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Chinese Journal of Chemical Engineering 2024年第10期74卷 133-143页

作者： Chao zhang Youzhi Liu Weizhou Jiao Guisheng Qi Zhiguo Yuan qiaoling zhang Hongyan Shen Shanxi Province Key Laboratory of Chemical Process Intensification North University of ChinaTaiyuan 030051China

In this study,the fluid flow and mixing process in an impinging stream-rotating packed bed(IS-RPB)is simulated by using a new three-dimensional computational fluid dynamics ***,the gaseliquid flow is simulated by the Euler-Euler model,the hydrodynamics of the reactor is predicted by the RNG k-εmethod,and the high-gravity environment is simulated by the sliding mesh *** turbulent mass transfer process is characterized by the concentration variance c^(2) and its dissipation rateεc formulations,and therefore the turbulent mass diffusivity can be directly *** simulated segregation index Xs is in agreement with our previous experimental *** simulated results reveal that the fringe effect of IS can be offset by the end effect at the inner radius of RPB,so the investigation of the coupling mechanism between IS and RPB is critical to intensify the mixing process in IS-RPB.

关键词： Impinging stream-rotating packed bed Turbulent mass diffusivity model Computational fluid dynamics Mixing performance Segregation index

Preparation by High-gravity Technology of a Cu/N-TiO_(2) Nanophotocatalyst for Photodegradation of Phenol Wastewater

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 151-161页

作者： Ren Xueqing zhang qiaoling zhang Yanfen Qi Guisheng Guo Jing Gao Jing Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering School of Chemical Engineering and TechnologyNorth University of ChinaTaiyuanShanxi 030051China

TiO_(2) is a promising photocatalyst,but its practical use is restricted by its low catalytic efficiency caused by the large particle size and uneven size distribution,which arise from the limited contact area of the liquid-liquid interface during *** stream-rotating packed bed(IS-RPB)reactors,which are used for process intensification,overcome the mixing limitation of traditional stirred-tank reactors and provide a micromixing environment at the molecular scale for the two liquid phases,which can reduce the particle size and distribution ***/N-TiO_(2) nanoparticles were prepared in an IS-RPB reactor by the one-step precipitation method using urea as the nitrogen source,titanyl sulfate as the titanium source,copper chloride as the copper source,and ammonium hydroxide as the *** particle size of the photocatalyst was about 11.40 nm with a narrow size distribution measured by scanning electron microscopy and transmission electron microscopy.X-ray photoelectron spectroscopy showed that N replaced some O and was uniformly dispersed in the TiO_(2) lattice as interstitial and substitutional *** replaced some Ti and was present as Cu^(2+).The synergistic effects of these two elements formed a new impurity energy level and reduced the band gap energy of the TiO_(2) *** specific surface area of the Cu/N-TiO_(2) nanoparticles was 152.97 m^(2)/*** effects of the main factors on the degradation rate were studied,and the removal efficiency reached 100%under the optimal operating conditions after 2 h ultraviolet *** electron paramagnetic resonance measurements showed that the superoxide radical played a main role in the degradation process,whereas the photogenerated holes and hydroxyl radicals had weak effects.

关键词： Cu/N-TiO_(2) co-doping Impinging stream rotating packed bed photocatalysis phenol

Photocatalytic ozonation-based degradation of phenol by ZnO—TiO_(2)nanocomposites in spinning disk reactor

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Chinese Journal of Chemical Engineering 2024年第8期72卷 74-84页

作者： Xueqing Ren Jiahao Niu Yan Li Lei Li Chao zhang Qiang Guo qiaoling zhang Weizhou Jiao Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering School of Chemistry and Chemical EngineeringNorth University of ChinaTaiyuan 030051China Shanxi Sanqiang New Energy Technology Co. LtdTaiyuan 030051China

Spinning disk reactor(SDR)has emerged as a novel process intensification photocatalytic reactor,and it has higher mass transfer efficiency and photon utilization for the degradation of toxic organic pollutants by advanced oxidation processes(AOPs).In this study,ZnO—TiO_(2)nanocomposites were prepared by solgel method,and coated on the disk of SDR by impregnation-pull-drying-calcination *** performance of catalyst was characterized by X-ray diffraction,scanning electron microscope,X-ray photoelectron spectroscopy,photoluminescence and ultraviolet—visible diffuse reflectance *** ozonation in SDR was used to remove phenol,and various factors on degradation effect were studied in *** results showed that the rate of degradation and mineralization reached 100%and 83.4%under UV light irradiation after 50 min,compared with photocatalysis and ozonation,the removal rate increased by 69.3%and 34.7%,and mineralization rate increased by 56.7%and 62.9%,which indicated that the coupling of photocatalysis and ozonation had a synergistic *** radical capture experiments demonstrated that the active species such as photogenerated holes(h^(+)),hydroxyl radicals(·OH),superoxide radical(·O_(2)-)were responsible for phenol degradation,and·OH played a leading role in the degradation process,while h+and·O_(2)^(-)played a non-leading role.

关键词： Spinning disk reactor Photocatalytic ozonation ZnO-TiO_(2)nanocomposites Advanced oxidation processes

Effects of Airflow Field on Droplets Diameter inside the Corrugated Packing of a Rotating Packed Bed

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China Petroleum Processing & Petrochemical Technology 2014年第4期16卷 38-46页

作者： Xu Chengcheng Jiao Weizhou Liu Youzhi Guo Liang Yuan Zhiguo zhang qiaoling Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of China

Rotating packing bed(RPB) has a better mixing performance than traditional mixers and shows potential application in the petroleum industry. However, acquisition of information about the mixing process directly through experiments is difficult because of the compact structure and complex multiphase flow pattern in RPB. To study the mixing characteristic, Fluent, the computational fluid dynamics(CFD) software, was used to explore the effect of airflow field on droplet diameter. For conducting calculations, the gas-liquid two-phase flow inside the packing was simulated with the RNG k-ε turbulence model and the Lagrange Discrete Phase Model(DPM), respectively. The numerical calculation results showed that coalescence and breakup of droplets can take place in the gas phase flow inside the packing and can be strengthened with increased rotating speed, thereby leading to the enlargement of the average diameter.

关键词： rotating packed bed computational fluid dynamics gas-liquid flow field diameter mixing

Dispersion Performance of Methanol-Diesel Emulsified Fuel Prepared by High Gravity Technology

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China Petroleum Processing & Petrochemical Technology 2014年第1期16卷 27-34页

作者： Jiao Weizhou Li Jing Liu Youzhi zhang qiaoling Liu Wenli Xu Chengcheng Guo Liang Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of China

A new continuous process for preparing methanol-diesel emulsified fuel with an Impinging Stream-Rotating Packed Bed is proposed. The droplet size of dispersed phase(methanol) of the emulsified fuel has a significant effect on the combustion of methanol-diesel emulsified fuel. In this paper, the methanol-diesel emulsified fuel uses diesel as the continuous phase and methanol as the dispersed phase. The Sauter mean diameter of the dispersed phase of methanol-diesel emulsified fuel was characterized with microphotography and arithmetic method. The experimental result showed that the Sauter mean diameter of the dispersed phase, which was decreased with the augmentation of the high gravity factor, liquid flow rate and emulsifier dosage, was inversely proportional to the methanol content. The Sauter mean diameter of the dispersed phase can be controlled and adjusted in the range of 12—40 μm through the change of operating conditions. The correlative expressions of the Sauter mean diameter of emulsified fuel were obtained and the calculated values agreed well with the experimental values.

关键词： emulsion methanol-diesel blend impinging stream-rotating packed bed dispersion Sauter mean diameter

Diffusion Characteristics and Removal of Cyclohexane in Polyolefin Elastomer Melt

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China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 76-85页

作者： Qi Jibing Yang Tong Liu Yandong Yuan Zhiguo zhang qiaoling Liu Youzhi Yi Jianjun Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China Petrochemical Research Institute PetroChina Co.Ltd.Beijing 102206China

The diffusion coefficient of volatiles in polymer solutions is a crucial parameter to describe the mass transfer efficiency and ability of *** this research,polyolefin elastomer(POE)was used as a polymer,and cyclohexane was used as a volatile.A gravimetric analysis was applied to measure the diffusion coefficient of cyclohexane in *** devolatilization rate of the POE-cyclohexane system under different conditions was *** effects of temperature,film sample thickness,and initial concentration of volatiles on the devolatilization rate were *** on the devolatilization rate data,the average diffusion coefficient of cyclohexane in POE was obtained by fitting with a mathematical *** experimental results indicate that the devolatilization rate increased with increasing temperature and initial concentration of volatiles,but it decreased with increasing sample *** the thickness increased,the overall diffusion resistance *** the temperature increased,the molecular movement increased,resulting in the increase of average diffusion *** relationship between the diffusion coefficient of the POE-cyclohexane system and temperature follows the Arrhenius *** diffusion activation energy E=6201.73 J/mol,and the pre-exponential factor of the diffusion coefficient D0=2.64×10^(-10) m^(2)/*** work can provide basic data for exploring the devolatilization of POE polymers and serves as a useful reference for enhancing the effect of devolatilization.

关键词： diffusion coefficient gravimetric analysis polyolefin elastomer(POE) cyclohexane devolatilization rate

Effect of glutathione on Lactiplantibacillus plantarum stability during room temperature storage and the underlying mechanism of action

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Food Bioscience 2022年第4期48卷 406-414页

作者： Caiqing Yao Zongbai He Jing Li E.Jingjing Ruixue Wang qiaoling zhang Junguo Wang Key Laboratory of Dairy Biotechnology and Engineering Ministry of EducationKey Laboratory of Dairy Products ProcessingMinistry of Agriculture and Rural AffairsInner Mongolia Agricultural UniversityHuhhot010018China Department of Food Science and Engineering Inner Mongolia Agricultural UniversityHohhot010018China

Previous studies have found that the decreased activity of probiotics during long-term storage is one of the main reasons leading to the decline of probiotics *** improve the stability of probiotics during storage at room temperature,this study observed the effect of glutathione(GSH)addition to the culture medium on the storage stability of four Lactiplantibacillus plantarum *** results showed that the absorption of GSH by *** was strain-specific;Strain with GSH absorption capacity had significantly improved room temperature storage stability(P<0.05).The mechanism of action was also *** main reason for the death of the strain during storage was the loss of integrity caused by the oxidation of unsaturated fatty acids on the cell membrane,after the consumption of GSH by a strain,the scavenging rates of 1,1-diphenyl-2-nitrophenylhydrazine free radical(DPPH)and hydroxyl free radical,as well as their total reducing ability,were significantly increased(P<0.05).Reactive oxygen species(ROS)were effectively eliminated after absorption of GSH by a particular strain during storage(P<0.05),which reduced the oxidation of unsaturated fatty acids on cell membrane,the ratio of unsaturated fatty acids to saturated fatty acids(U/S)in the cell membrane was maintained,which reduced cell membrane damage and improved storage stability at room *** findings provide a theoretical reference for improving strain storage stability at room temperature by adjusting the composition of the culture medium.

关键词： Lactiplantibacillus plantarum Glutathione Freeze-drying survival rate Room temperature storage stability