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Process intensification and energy saving of reactive distillation for production of ester compounds

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1307-1323页

作者： chunli li Cong Duan Jing Fang Hongshi li School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization Tianjin 300130China

Reactive distillation(RD) process is an innovative hybrid process combining reaction with distillation, which has recently come into sharp focus as a successful case of process intensification. Considered as the most representative case of process intensification, it has been applied for many productions, especially for production of ester compounds. However, such problems existing in the RD system for ester productions are still hard to solve,as the removal of the water which comes from the esterification, and the separation of the azeotropes of ester–alcohol(–water). Many methods have been studying on the process to solve the problems resulting in further intensification and energy saving. In this paper, azeotropic–reactive distillation or entrainer enhanced reactive distillation(ERD) process, reactive extractive distillation(RED) process, the method of co-production in RD process, pressure-swing reactive distillation(PSRD) process, reactive distillation–pervaporation coupled process(RD–PV), are introduced to solve the problems above, so the product(s) can be separated efficiently and the chemical equilibrium can be shifted. Dividing-wall column(DWC) structure and novel methods of loading catalyst are also introduced as the measures to intensify the process and save energy.

关键词： Reactive distillation Process intensification Process coupling Thermal coupling

A review of internally heat integrated distillation column

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1272-1281页

作者： Jing Fang Xiaomin Cheng Zhongyang li Hao li chunli li School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization Tianjin 300130China

The energy consumption of distillation operation determines the amount of energy consumption throughout the chemical separation process. A heat integrated distillation column(HIDiC) could greatly reduce the irreversibility of the distillation process, so it gradually becomes a research hotspot. There are two major techniques for heat integration in HIDiC: internally and externally. This review paper describes the major research aspects of an internally heat integrated distillation column(IHIDiC), including the heat transfer models, various design structures(including the two-column HIDiC, Concentric HIDiC, Shell and tube HIDiC, Plate-fin HIDiC and the Super HIDiC, etc.), experimental research, simulation and optimization, process control research, as well as industrial plants and potential industrial applications. Among them, the heat transfer performance of various structures was analyzed of the various design structures based on experimental research, the effects of different factors(including relative volatility, reflux ratio, compression ratio, etc.) on HIDiC energy consumption or TAC is summarized in the simulation part. The calculation methods of the overall heat transfer coefficient and heat transfer models are summarized. The various optimization algorithms and optimization results of simplified HIDiC are summarized in the optimization part. The research status and the key technical issues in various aspects of HIDiC are summarized in this paper. In order to meet the requirements of industrial energy efficiency,the selection of multi-component separation distillation configurations needs to be considered more diversified,and internal complex coupling relationship of HIDiC needs to be further studied.

关键词： HIDIC Distillation Heat integrated Energy consumption Energy conservation

Optimization of Dividing Wall Column with Heat Transfer Process Across the Wall for Feed Properties Variation

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China Petroleum Processing & Petrochemical Technology 2019年第2期21卷 118-124页

作者： Hu Yuqi li chunli National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization School of Chemical Engineering and TechnologyHebei University of Technology

This paper investigates the thermal-coupled effect across the wall and the optimal heat transfer region of the wall for enhancing the energy saving effect of dividing wall column (DWC), and also studies the effects of feed thermal condition (q) and middle component composition of feed (cB) on the heat transfer process, the optimal heat transfer region, and the maximum heat transfer quantity across the wall. The simulation results show that the maximum heat transfer quantity across the wall and the potential for energy saving increase with the increase of q, while with the limitation of temperature difference across the wall, the beneficial heat transfer effect between certain range of stages, which are involved in the optimal heat transfer region, cannot be realized completely for a specific value of q. Besides, compared with q, a changing cB does not change the degree of realizing the beneficial heat transfer effect, but can bring about the variation of liquid split ratio (RL) and vapor split ratio (Rv). Thus, for achieving a maximum energy-saving effect of DWC, different q and cB need to find its own corresponding suitable heat transfer process across the wall.

关键词： dividing wall column heat transfer process thermal-coupled effect feed properties

Modeling Microstructural Evolution under the Influence of Thermosolutal Convection during Ingot Solidification Process

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Journal of Materials Science & Technology 2003年第z1期19卷 20-22页

作者： Qiang li chunli Mo Dianzhong li Bainian Qian Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A model combined both macroscopic transport and microstructural evolution is applied to describe the influence of thermosolutal convection on microstructural evolution during the solidification process. Firstly, the volume average method and Simpler algorithm are used to solve the macroscopic transport equation. Then the calculated results are incorporated into the cellular automaton (CA) model to simulate the microstructural evolution. Using this model, a simple casting ingot is applied to simulate microstructural evolution. Through the simulation, it is found that the thermosolutal convection has a strong influence on the redistribution of temperature field and solute field, which influence the solidification microstructural evolution.

关键词： Modeling, Thermosolutal convection, CA, Microstructural evolution

Reactive dividing-wall column for the co-production of ethyl acetate and n-butyl acetate

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Chinese Journal of Chemical Engineering 2019年第1期27卷 136-143页

作者： Hongshi li Tong li chunli li Jing Fang lihui Dong National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization Hebei University of Technology

Reactive dividing-wall column(RDWC) technology plays a critical role in the energy saving and high efficiency of chemical *** this article, the process of co-producing ethyl acetate(EA) and n-butyl acetate(BA) with RDWC was *** was not only the product, but also acted as entrainer to remove the water generated by the two esterification *** and simulations of the co-production process were carried *** was found that the experimental results were in good agreement with the simulation *** kinds of RDWC structures(RDWC-FC and RDWC-RS) were proposed, and the co-production process operating parameters of the two types of RDWC were optimized by Aspen Plus *** optimal operating parameters of the RDWC-FC were determined as follows: 0.6 of the reflux ratio of aqueous phase(RR), 0.66 of the vapor split(R_V) and 0.51 of the liquid split(R_L).And the optimal operating parameters of the RDWC-RS were shown as follows: RR was 0.295 and R_V was ***, the energy saving analysis of the co-production process was based on the annual output of 10000 tons of EA, compared with the traditional reaction distillation(RD) to prepare EA and BA, the reboiler duty of the RDWC-FC column could save 20.4%, TAC saving 23.6%; RDWC-RS reboiler energy consumption could save 17.0%, TAC 22.2%.

关键词： Reactive dividing-wall columns Ethyl acetate n-Butyl acetate Coproduction Energy-saving

Multiphase Flow Simulation of New Vapor Distributor in Dividing Wall Column and Control Mechanism

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China Petroleum Processing & Petrochemical Technology 2020年第3期22卷 109-118页

作者： Hu Yuqi li Xiaoran li chunli National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130

A new vapor distributor based on the Coanda effect is added to the Dividing Wall column(DWC),and the multiphase flow simulation is performed using ANSYS Fluent by this *** results show that with the addition of the liquid phase,the new vapor distributor still follows the Coanda ***,the vapor is ejected from the slits of the distributor to take away the surrounding vapor,and a negative pressure is formed under the distributor,so as to achieve the purpose of regulating *** to the working principle of vapor distributor,a certain amount of vapor is drawn out from a position of prefractionator,which is equivalent to the vapor ejected by the *** same amount of vapor is fed into the main column,which corresponds to the gas phase at the inlet of the *** Rv is adjusted by changing the speed of the input or output *** results show that adding this control mechanism on the basis of temperature or concentration control structure can better achieve the effect of vapor distribution.

关键词： Aspen Plus ANSYS fluent DWC simulation optimization control mechanism

Tuning macrophages for atherosclerosis treatment

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Regenerative Biomaterials 2023年第1期10卷 280-293页

作者： Fei Fang Crystal Xiao chunli li Xiaoheng liu Song li Institute of Biomedical Engineering West China School of Basic Medical Sciences&Forensic MedicineSichuan UniversityChengdu 610041China Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA Department of Medicine University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Atherosclerosis is a chronic inflammatory vascular disease and a leading cause of death *** play an important role in inflammatory responses,cell-cell communications,plaque growth and plaque rupture in atherosclerotic ***,we review the sources,functions and complex phenotypes of macrophages in the progression of atherosclerosis,and discuss the recent approaches in modulating macrophage phenotype and autophagy for atherosclerosis *** then focus on the drug delivery strategies that target macrophages or use macrophage membrane-coated particles to deliver therapeutics to the lesion *** biomaterial-based approaches that target,modulate or engineer macrophages have broad applications for disease therapies and tissue regeneration.

关键词： macrophages atherosclerosis drug delivery system immune engineering

Polymorphism of D-mannitol:Crystal structure and the crystal growth mechanism

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Chinese Journal of Chemical Engineering 2017年第3期25卷 358-362页

作者： Weiyi Su Na Jia Hongshi li Hongxun Hao chunli li School of Chemical Engineering and Technology Hebei University of Technology School of Chemical Engineering and Technology Tianjin University

The polymorphism of D-Mannitol(mannitol) is reviewed in this paper. It was found that the structure of the stable form is consistent in most literatures, but different authors have given different information about the two metastable forms. Therefore the commonly used nomenclature of mannitol was summarized based on the crystal unit cell parameters with the help of X-ray powder diffraction. Moreover, the crystal growth mechanism of mannitol polymorphs was summarized. Considering the lack of kinetic data for the metastable form especially, a reported method was attempted to apply to δ mannitol in an aqueous cooling crystallization process based on the induction time previously measured, and it was identified that the growth of the δ form follows the two-dimensional(2D) nucleationmediated mechanism. The results also indicate that the method based on induction time and supersaturation should have the potential to be expanded to the metastable polymorphs for the growth property study in a bulk system.

关键词： Crystallization Pharmaceuticals Polymorphism D-mannitol Crystal growth

A review:Modification strategies of nickel-rich layer structure cathode(Ni≥0.8)materials for lithium ion power batteries

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Journal of Energy Chemistry 2021年第9期30卷 435-450页

作者： Haijian Lv chunli li Zhikun Zhao Borong Wu Daobin Mu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Guangdong Key Laboratory of Battery Safety Guangzhou Institute of Energy TestingGuangzhou 511447GuangdongChina

lithium ion power batteries have undoubtedly become one of the most promising rechargeable batteries at present;nonetheless,they still suffer from the challenges such as requirement of even higher energy density and capacity ***-rich layer oxides(Ni≥0.8)become ideal cathode materials to achieve the high specific *** of optimization of synthesis process and modification of crystal structure to suppress the capacity fading can obviously improve the performance of the lithium ion *** review presents the recent modification strategies of the nickel-rich layered oxide *** in previous reviews and related papers,the specific mechanism about each type of the modification strategies is specially discussed in detail,which is mainly about inhibiting the anisotropic lattice strain and adjusting the cation mixing degree to maintain crystal *** on the recent progress,the prospects and challenges of the modified nickel-rich layer cathodes to upgrade the property of lithium ion batteries are also comprehensively analyzed,and the potential applications in the field of plug-in hybrid vehicles and electric vehicles are further discussed.

关键词： Nickel-rich layer cathodes Structural stability Modification strategies Power batteries