检索结果-南通市图书馆

Design and optimization of an integrated process for the purification of propylene oxide and the separation of propylene glycol by-product

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第5期35卷 111-120页

作者： Song Hu jinlong li Qihua Wang Weisheng Yang State Key Laboratory of Green Chemical Engineering and Industrial Catalysis SINOPEC Shanghai Research Institute of petrochemical TechnologyShanghai 201208China School of Petrochemical Engineering Changzhou UniversityChangzhou 213164China

It is difficult to separate the methanol and hydrocarbons in the propylene oxide(PO)purification process due to their forming *** for this,a novel PO separation process,in that the deionized water is employed as extractant and 1,2-propylene glycol(MPG)that is formed from the PO hydrolysis reaction is recovered,is presented in this *** salient feature of this process is that both the non-catalyzed reactions of PO hydrolysis to form MPG and dipropylene glycol(DPG)are simultaneously considered and MPG by-product with high purity is obtained in virtue of the deionized water as reflux liquid and side take-off in MPG *** addition,the ionic liquid(IL)extractant is screened through the conductorlike screening model for segment activity coefficient(COSMO-SAC)and the comparisons of separation efficiency between the IL and normal octane(nC_(8))extractant for the separation of PO and 2-methylpentane are *** the non-random two-liquid(NRTL)thermodynamic model,the simulation and optimization design for the full flow sheet are performed and the effects of the key operation parameters such as solvent ratio,theoretical stages,feeding stage *** separation efficiency are detailedly *** results show that the mass purity and the mass yield of PO can be up to 99.99%and 99.0%,and the condenser duty,reboiler duty and PO loss in the process with IL extractant can be decreased by 69.66%,30.21%and 78.86%compared to ones with nC_(8).The total annual cost(TAC)calculation also suggests that the TAC would be significantly reduced if using IL in replace of nC_(8) for the investigated *** presented results would provide a useful guide for improving the quality of PO product and the economic efficiency of industrial plant.

关键词： Propylene oxide purification Ionic liquids Separation Extractive distillation Hydrolysis 1 2-propylene glycol

Tribocorrosion behavior in artificial seawater and anti-microbiologically influenced corrosion properties of TiSiN-Cu coating on F690 steel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第3期35卷 448-459页

作者： Fuliang Ma jinlong li Zhixiang Zeng Yimin Gao Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University

The TiSiN-Cu nanocomposite coating was deposited on F690 steel substrate by arc ion plating. The structure and composition, tribocorrosion behavior and anti-microbiologically influenced corrosion(MIC)properties of TiSiN-Cu coating were investigated. The results show that the TiSiN-Cu coating has unique nanocomposite structures. The results of tribocorrosion show that the potential and current change of F690 steel and TiSiN-Cu coatings tend to be opposite. The reason is that the F690 steel is non-passivated metal and the TiSiN-Cu coating has passivation phenomenon. The TiSiN-Cu coating possesses excellent tribocorrosion resistance. Cu ion released from TiSiN-Cu coating can effectively inhibit the corrosion caused by SRB.

关键词： TiSiN-Cu nanocomposite coating F690 steel substrate Tribocorrosion behavior Microbiologically influenced corrosion

Temporal pattern mining from user-generated content

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2022年第6期8卷 1027-1039页

作者： Adnan Ali jinlong li Huanhuan Chen Ali Kashif Bashir School of Computer Science and Technology University of Science and Technology of ChinaHefei230026AnhuiChina Department of Computing and Mathematics Manchester Metropolitan UniversityManchesterM156BHUnited Kingdom Department of Computer Science and Mathematics Lebanese American UniversityBeirutLebanon Woxsen School of Business Woxsen UniversityIndia

Faster internet, IoT, and social media have reformed the conventional web into a collaborative web resulting in enormous user-generated content. Several studies are focused on such content;however, they mainly focus on textual data, thus undermining the importance of metadata. Considering this gap, we provide a temporal pattern mining framework to model and utilize user-generated content's metadata. First, we scrap 2.1 million tweets from Twitter between Nov-2020 to Sep-2021 about 100 hashtag keywords and present these tweets into 100 User-Tweet-Hashtag (UTH) dynamic graphs. Second, we extract and identify four time-series in three timespans (Day, Hour, and Minute) from UTH dynamic graphs. Lastly, we model these four time-series with three machine learning algorithms to mine temporal patterns with the accuracy of 95.89%, 93.17%, 90.97%, and 93.73%, respectively. We demonstrate that user-generated content's metadata contains valuable information, which helps to understand the users' collective behavior and can be beneficial for business and research. Dataset and codes are publicly available;the link is given in the dataset section.

关键词： Social media analysis Collaborative computing Social data Twitter data Temporal patterns mining Dynamic graphs

Shaping of metal-organic frameworks through a calcium alginate method towards ethylene/ethane separation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第2期35卷 17-24页

作者： jinlong li Xiaoqing Wang Puxu liu Xiaohua liu libo li Jinping li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China

The separation of ethylene and ethane is a crucial,challenging and cost-intensive process in chemical ***-organic frameworks(MOFs)are a class of novel porous adsorbents used for the separation of ethylene/ethane ***,MOFs are normally crystalline powders that cause multiple problems,such as dust,abrasion and heat/mass loss,as well as significant pressure drops on the adsorption bed resulting in a sudden stop in *** solve these issues,we have prepared four different sphere-shaped adsorbents,including Mg-gallate,Co-gallate,MUV-10(Mn)and MIL-53(Al)using a calcium alginate method to achieve excellent ethylene/ethane separation *** performance of the sphere-shaped adsorbents has been validated using mechanical strength measurements,powder X-ray diffraction,scanning electron microscopy,thermogravimetric analysis,gas adsorption isotherms and dynamic breakthrough *** excellent mechanical strength of these sphere-shaped adsorbents meets the criteria for industrial application in gas ***,the energy consumption and operating cost will be further reduced in the ethylene production *** believe that this shaping method will open a prosperous route to the development of MOFs toward higher technology levels and their commercial application.

关键词： Metal-organic frameworks Alginates Shaping Mechanical properties Adsorption Separation

Study on co-cracking performance of different hydrocarbon mixture in a steam pyrolysis furnace

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第9期24卷 1252-1262页

作者： Benfeng Yuan jinlong li Wenli Du Feng Qian Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology School of Information Science and Technology East China University of Science and Technology

Co-cracking is a process where the mixtures of different hydrocarbon feedstocks are cracked in a steam pyrolysis furnace, and widely adopted in chemical industries. In this work, the simulations of the co-cracking of ethane and propane, and LPG and naphtha mixtures have been conducted, and the software packages of COILSIM1 D and Sim CO are used to account for the cracking process in a tube reactor. The effects of the mixing ratio, coil outlet temperature, and pressure on cracking performance have been discussed in detail. The co-cracking of ethane and propane mixture leads to a lower profitability than the cracking of single ethane or single propane. For naphtha, cracking with LPG leads to a higher profitability than single cracking of naphtha, and more LPG can produce a higher profitability.

关键词： Co-cracking Mixing ratio Coil outlet temperature(COT) Coil outlet pressure(COP) Pyrolysis furnace

Investigation on mechanical properties regulation of rock-like specimens based on 3D printing and similarity quantification

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第5期34卷 573-585页

作者： Duanyang Zhuang Zexu Ning Yunmin Chen jinlong li Qingdong li Wenjie Xu Center for Hypergravity Experiment and Interdisciplinary Research Zhejiang UniversityHangzhou 310058China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

3D printing is widely adopted to quickly produce rock mass models with complex structures in batches,improving the consistency and repeatability of physical *** is necessary to regulate the mechanical properties of 3D-printed specimens to make them proportionally similar to natural *** study investigates mechanical properties of 3D-printed rock analogues prepared by furan resin-bonded silica sand *** mechanical property regulation of 3D-printed specimens is realized through quantifying its similarity to sandstone,so that analogous deformation characteristics and failure mode are *** similarity conversion,uniaxial compressive strength,cohesion and stress–strain relationship curve of 3D-printed specimen are similar to those of *** the study ranges,the strength of 3D-printed specimen is positively correlated with the additive content,negatively correlated with the sand particle size,and first increases then decreases with the increase of curing *** regulation scheme with optimal similarity quantification index,that is the sand type of 70/140,additive content of 2.5‰and curing temperature of 81.6℃,is determined for preparing 3D-printed sandstone analogues and *** effectiveness of mechanical property regulation is proved through uniaxial compression contrast *** study provides a reference for preparing rock-like specimens and engineering models using 3D printing technology.

关键词： 3D printing Mechanical property regulation Similarity quantification Rock analogue Sandstone

Progress and performance evaluation of Bei Dou global navigation satellite system： Data analysis based on BDS-3 demonstration system

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2018年第5期61卷 614-624页

作者： Yuanxi YANG Yangyin XU jinlong li Cheng YANG State Key Laboratory of Geo-information Engineering Xi'an 710054 China Institute of Geographical Spatial Information Information Engineering University Zhengzhou 450001 China Beijing Satellite Navigation Center Beijing 100094 China School of Land Science and Geomatics China University of Geosciences Beijing 100083 China

The first two Medium Earth Orbit(MEO) satellites of the third generation of Bei Dou satellite navigation System(BDS-3) were successfully launched on November 5, 2017. This historical launch starts the new era of the global navigation satellite system of Bei Dou. Before the first two satellites of BDS-3, a demonstration system for BDS-3 with five satellites,including two Inclined Geosynchronous Orbit satellites(IGSO) and three MEO satellites, was established between 2015 and2016 for testing the new payloads, new designed signals and new techniques. In the demonstration system, the new S frequency signal and satellite hydrogen clock as well as inter-satellite link(ISL) based on Ka-band signals with time-division multiple addresses(TDMA) were tested. This paper mainly analyzes the performances of the demonstration system, including the signalto-noise ratios, pseudorange errors and the multipath errors of the civilian signals of BDS-3. The qualities of signals in space,time synchronization and timing precision were tested as well. Most of the performances were compared with those of the regional Bei Dou satellite navigation system(BDS-2). At last, the performances of positioning, navigation and timing(PNT) of the future Bei Dou global system(BDS-3) were evaluated based on the signal quality of the present demonstration satellite system.

关键词： Bei Dou-3 Demonstration satellite Signal Timing Signal-to-noise ratios

Densities and viscosities for ionic liquids [BMIM][BF4] and [BMIM][Cl] and their binary mixtures at various temperatures and atmospheric pressure

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第12期27卷 2994-2999页

作者： jinlong li Hong Zhu Changjun Peng Honglai liu Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology and School of Petrochemical Engineering Changzhou UniversityChangzhou 213164China State Key Laboratory of Chemical Engineering and Department of Chemistry East China University of Science and TechnologyShanghai 200237China

The density and viscosity of 1-butyl-3-methylimidazolium tetrafluoroborate[BMIM][BF4]and 1-butyl-3-methylimidazolium chloride[BMIM][Cl]and their binary mixtures within the temperatures from 303.15 K to323.15 K and at ambient pressure were determined in this *** temperature dependences of density and viscosity were satisfactorily described with the linear model and the Vogel-Tammann-Fulcher type equation,*** molar volume and viscosity of binary IL mixtures were predicted through ideal mixing rules showing that almost null deviations for IL mixtures were observed and their mixing was remarkably close to linear ideal behavior in the molar volumes,while comparatively large errors in viscosity ***,the molar volume of the investigated pure ILs and their mixtures could well be predicted by a predictive model presented by Valderrama et al.(Fluid Phase Equilib.,275(2009)145).

关键词： Ionic liquid mixture Density Viscosity Excess property

Economic and entropy production evaluation of extractive distillation and solvent-assisted pressure-swing distillation by multi-objective optimization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第11期63卷 246-259页

作者： Yao Wang Qing Ye jinlong li Qingqing Rui Azhi Yu Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China

Extractive distillation(ED)and solvent-assisted pressure-swing distillation(SA-PSD)are both special distillation processes that perform good at separating pressure-insensitive ***,few reported studies have compared the performance of the two *** this paper,ED processes with N-methylpyrrolidone(NMP)and dimethlac-etamide(DMCA)as entrainer,SA-PSD process with isopropyl-alcohol(IPA)as solvent and SA-PSD process with partial heat integration(PHI-PSD)are proposed to achieve high purity separation of a mixture of cyclohexane/2-butanol *** optimal operating conditions of the processes are obtained after optimizing with NSGA-Ⅱ algorithm when total annual cost(TAC)and the entropy production of process are set as *** optimal results show that the optimal PHI-PSD process has lower TAC by 28.7% and the lower entropy production by 39.5% than the optimal SA-PSD process while the ED process with NMP as entrainer has lower TAC by 50.9% and the lower entropy production by 56.1% than the optimal SA-PSD *** optimal results show that the ED process with NMP as entrainer has the best economic and thermodynamic efficiency among the four proposed processes in this paper.

关键词： Extractive distillation Solvent-assisted pressure-swing distillation Entropy production NSGA-Ⅱalgorithm Computer simulation