Utilization of carbon dioxide(CO_(2)) is of great significance in the development of CO_(2) absorption and the solution of greenhouse gas effect.Highly efficient conversion of CO_(2) into cyclic carbonate with green c...Utilization of carbon dioxide(CO_(2)) is of great significance in the development of CO_(2) absorption and the solution of greenhouse gas effect.Highly efficient conversion of CO_(2) into cyclic carbonate with green catalysts is essential for the more sustainable expansion of CO_(2) fixation.Traditional batch reactor is limited by low efficiency, high cost and low security. Meanwhile, continuous flow system showcased a myriad of virtues, including shortening the residence time from hours to seconds, and decreasing reaction temperature, and possessing the nature of easy industrial scale-up. In this paper, a continuous-flow microreaction system was developed to synthesis propylene carbonate(PC) from propylene oxide(PO) and CO_(2) using 1-butyl-3-methylimidazolium bromide([BMIM]Br) as catalyst. By observing the flow patterns inside microreaction system, the effects of reaction temperature, molar fraction of catalyst, operating pressure, residence time, molar ratio of CO_(2)/PO as well as recycling performance of catalyst on the overall performances were comprehensively evaluated into details. Under different reaction conditions,the flow patterns were set to vary between slug flow and annular flow. The results showed that the yield of propylene carbonate(PC) can reach99.7% at 140℃ and 3.0 MPa with the residence time of 166 s, while the recycling performance of the designed system greatly conforms the future trend of green chemistry.展开更多
4-Bromo-3-methylanisole is mainly used to synthesize black fluorane dye(2-anilino-3-methyl-6-dibutylaminofluorane, ODB-2), which is one of the most important heat and pressure-sensitive dyes in the manufacture of ther...4-Bromo-3-methylanisole is mainly used to synthesize black fluorane dye(2-anilino-3-methyl-6-dibutylaminofluorane, ODB-2), which is one of the most important heat and pressure-sensitive dyes in the manufacture of thermal papers. Compared to the industrial heterogeneous batch process, a continuous homogeneous bromination technology in a modular microreaction system has been developed, and 4-bromo-3-methylanisole has been successfully prepared through high-selective mono-bromination of 3-methylanisole with Br2 solution in CHCl3. In optimal conditions, the content of bis-brominated byproducts can be controlled less than 0.5%,which is superior to the industrial standard with 99.5% 3-methylanisole conversion at very short residence time and mild reaction temperature.展开更多
3-Methylpyridine-N-oxide is an essential intermediate in the preparation of 2-chloro-5-methylpyridine,which can be used to synthesize nicotine insecticides such as imidacloprid and acetamiprid.The traditional method o...3-Methylpyridine-N-oxide is an essential intermediate in the preparation of 2-chloro-5-methylpyridine,which can be used to synthesize nicotine insecticides such as imidacloprid and acetamiprid.The traditional method of production of 3-methylpyridine-N-oxide is catalytic oxidation of 3-methylpyridine in semi-batch reactors.Due to strong exothermic reaction and explosive property of 3-methylpyridine,the reaction efficiency and safety is low using batch technology.Therefore,the development of a safer and efficient 3-methylpyridine-N-oxide production process is very necessary in industrial production.In this paper,microreaction systems were introduced into the preparation of 3-methylpyridine-N-oxide.The comparison of three different methods(traditional semibatch method,co-current microreaction method,and circular microreaction method)showed that the circular microreaction method was the most applicable,with relative higher product yield(~90%),less side reaction and better reaction control.展开更多
Au-Ag gradient alloy nanoparticles were directly synthesized in a microreaction system with their surface plasmon resonance been facilely adjusted.The surface plasmon resonance wavelength was red-shifted through incre...Au-Ag gradient alloy nanoparticles were directly synthesized in a microreaction system with their surface plasmon resonance been facilely adjusted.The surface plasmon resonance wavelength was red-shifted through increasing the raw ratio of Au^(3+):Ag^(+),decreasing the synthesis temperature or the residence time.A linear relationship was found between the surface plasmon resonance wavelength and the synthesis temperature,or the residence time.The range of surface plasmon resonance wavelength of monodispersed Au-Ag gradient alloy could be extended to 548 nm generated on the enrichment of Au as outer layer.It provided a suitable way to prepare Au-Ag gradient alloy NPs with longer surface plasmon resonance wavelength than 520 nm(Au)at low temperature.展开更多
Microreaction technology as an emerging tool for synthetic chemistry has been extensively applied in academic and industrial researches. Normally, synthetic chemists used to running reactions in the classical glasswar...Microreaction technology as an emerging tool for synthetic chemistry has been extensively applied in academic and industrial researches. Normally, synthetic chemists used to running reactions in the classical glassware for cen turies are unfamiliar and unaccustomed to use microreaction tech no logy for routine synthetic work. This review tries to give a general introduction of the capabilities of microreaction tech no logy.展开更多
A novel spray-assisted carbonation microreaction method for the synthesis of mesoporous silica microspheres is reported.The synthetic process comprises the preparation of a silica sol via a carbonation reaction,rapid ...A novel spray-assisted carbonation microreaction method for the synthesis of mesoporous silica microspheres is reported.The synthetic process comprises the preparation of a silica sol via a carbonation reaction,rapid gelation at high temperature,and subsequent rapid solvent evaporation by spray drying.The carbonation microreaction was conducted in a membrane dispersion microreactor,in the presence of sodium silicate and carbon dioxide reactants.The as-synthesized silica microspheres exhibit a uniform mesostructure,excellent dispersity,and a narrow particle size distribution,with average diameters of 1-2 μm,Brunauer-Emmett-Teller surface areas of 300-1149m2/g,and total pore volumes of 0.21-1.82 cm3/g.Relatively low concentrations of the silicate species and well-controlled silica condensation rates are responsible for the formation of the observed spherical morphology.The synthetic process is of significant practical importance as a result of using low-cost raw materials,and because of the excellent controllability and process stability displayed.Furthermore,this rapid and flexible method may be extended to the synthesis of various silica materials and their composites.展开更多
Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, im...Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, improved safety, and access to new products and processes are directed to the microreaction technology. Microfluidic mixer is the most important component in microfluidic devices. Based on various principles, active and passive micromixers have been designed and investigated. This review is focused on the recent developments in microfluidic mixers. An overview of the flow phenomena and mixing characteristics in active and passive micromixers is presented, including the types of physical phenomena and their utilization in micromixers. Due to the simple fabrication technology and the easy implementation in a complex microfluidic system, T-micromixer is highlighted as an example to illustrate the effect of design and operating parameters on mixing efficiency and fuid flow inside microfluidic mixers.展开更多
In exploring fiber-based materials,the advantages of their inner constructions and displayed wettabilities diversify their applications and especially facilitate the development of immiscible liquid separation.When co...In exploring fiber-based materials,the advantages of their inner constructions and displayed wettabilities diversify their applications and especially facilitate the development of immiscible liquid separation.When considering the basis of their liquid‒phase separation properties,such fibrous materials can be employed in more abundant and novel application fields in addition to oil-water separation.This article reviews the recent progress in the development of fiber-based materials with special surface wettabilities and further explores their potential in immiscible liquid separation-related fields,such as liquid/liquid mass transfer,and explores related applications in environmental purification,resource collection,energy storage and other fields.This article also explores the underlying nature that drives the wetting performance of fibrous surfaces,extends more diversified underliquid wetting models,and fully summarizes the separation mechanism and the latest corresponding applications,opening up an avenue for identifying the significance of devisable wetting performances and developing more diversified application potentials.Finally,this review proposes current challenges and expected developments in superwetting fiber-based materials with immiscible liquid separation abilities.展开更多
基金the supports of the National Natural Science Foundation of China(21991101,21991100)。
文摘Utilization of carbon dioxide(CO_(2)) is of great significance in the development of CO_(2) absorption and the solution of greenhouse gas effect.Highly efficient conversion of CO_(2) into cyclic carbonate with green catalysts is essential for the more sustainable expansion of CO_(2) fixation.Traditional batch reactor is limited by low efficiency, high cost and low security. Meanwhile, continuous flow system showcased a myriad of virtues, including shortening the residence time from hours to seconds, and decreasing reaction temperature, and possessing the nature of easy industrial scale-up. In this paper, a continuous-flow microreaction system was developed to synthesis propylene carbonate(PC) from propylene oxide(PO) and CO_(2) using 1-butyl-3-methylimidazolium bromide([BMIM]Br) as catalyst. By observing the flow patterns inside microreaction system, the effects of reaction temperature, molar fraction of catalyst, operating pressure, residence time, molar ratio of CO_(2)/PO as well as recycling performance of catalyst on the overall performances were comprehensively evaluated into details. Under different reaction conditions,the flow patterns were set to vary between slug flow and annular flow. The results showed that the yield of propylene carbonate(PC) can reach99.7% at 140℃ and 3.0 MPa with the residence time of 166 s, while the recycling performance of the designed system greatly conforms the future trend of green chemistry.
基金financial support from National Key R&D Program of China(2017YFB0307102)National Natural Science Foundation of China(21991100,21991104)。
文摘4-Bromo-3-methylanisole is mainly used to synthesize black fluorane dye(2-anilino-3-methyl-6-dibutylaminofluorane, ODB-2), which is one of the most important heat and pressure-sensitive dyes in the manufacture of thermal papers. Compared to the industrial heterogeneous batch process, a continuous homogeneous bromination technology in a modular microreaction system has been developed, and 4-bromo-3-methylanisole has been successfully prepared through high-selective mono-bromination of 3-methylanisole with Br2 solution in CHCl3. In optimal conditions, the content of bis-brominated byproducts can be controlled less than 0.5%,which is superior to the industrial standard with 99.5% 3-methylanisole conversion at very short residence time and mild reaction temperature.
基金the supports of the National Natural Science Foundation of China(21991101,2191100)the Key Project of Science&Technology Department of Sichuan Province(2017JZ0011)for this work。
文摘3-Methylpyridine-N-oxide is an essential intermediate in the preparation of 2-chloro-5-methylpyridine,which can be used to synthesize nicotine insecticides such as imidacloprid and acetamiprid.The traditional method of production of 3-methylpyridine-N-oxide is catalytic oxidation of 3-methylpyridine in semi-batch reactors.Due to strong exothermic reaction and explosive property of 3-methylpyridine,the reaction efficiency and safety is low using batch technology.Therefore,the development of a safer and efficient 3-methylpyridine-N-oxide production process is very necessary in industrial production.In this paper,microreaction systems were introduced into the preparation of 3-methylpyridine-N-oxide.The comparison of three different methods(traditional semibatch method,co-current microreaction method,and circular microreaction method)showed that the circular microreaction method was the most applicable,with relative higher product yield(~90%),less side reaction and better reaction control.
基金supports from the Fundamental Research Funds for National Nature Science Foundation of China(51172072)the Central Universities(WJ0913001)+1 种基金the Focus of Scientific and Technological Research Projects(109063)the State Key Laboratory of Chemical Engineering at ECUST(SKL-ChE-08C09).
文摘Au-Ag gradient alloy nanoparticles were directly synthesized in a microreaction system with their surface plasmon resonance been facilely adjusted.The surface plasmon resonance wavelength was red-shifted through increasing the raw ratio of Au^(3+):Ag^(+),decreasing the synthesis temperature or the residence time.A linear relationship was found between the surface plasmon resonance wavelength and the synthesis temperature,or the residence time.The range of surface plasmon resonance wavelength of monodispersed Au-Ag gradient alloy could be extended to 548 nm generated on the enrichment of Au as outer layer.It provided a suitable way to prepare Au-Ag gradient alloy NPs with longer surface plasmon resonance wavelength than 520 nm(Au)at low temperature.
文摘Microreaction technology as an emerging tool for synthetic chemistry has been extensively applied in academic and industrial researches. Normally, synthetic chemists used to running reactions in the classical glassware for cen turies are unfamiliar and unaccustomed to use microreaction tech no logy for routine synthetic work. This review tries to give a general introduction of the capabilities of microreaction tech no logy.
基金We gratefully acknowledge the support from the National Nat-ural Science Foundation of China(Nos.91334201,U1463208 and 21506110).
文摘A novel spray-assisted carbonation microreaction method for the synthesis of mesoporous silica microspheres is reported.The synthetic process comprises the preparation of a silica sol via a carbonation reaction,rapid gelation at high temperature,and subsequent rapid solvent evaporation by spray drying.The carbonation microreaction was conducted in a membrane dispersion microreactor,in the presence of sodium silicate and carbon dioxide reactants.The as-synthesized silica microspheres exhibit a uniform mesostructure,excellent dispersity,and a narrow particle size distribution,with average diameters of 1-2 μm,Brunauer-Emmett-Teller surface areas of 300-1149m2/g,and total pore volumes of 0.21-1.82 cm3/g.Relatively low concentrations of the silicate species and well-controlled silica condensation rates are responsible for the formation of the observed spherical morphology.The synthetic process is of significant practical importance as a result of using low-cost raw materials,and because of the excellent controllability and process stability displayed.Furthermore,this rapid and flexible method may be extended to the synthesis of various silica materials and their composites.
基金the National High Technology Research and Development Program of China(2006AA030202,2006AA05Z316)
文摘Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, improved safety, and access to new products and processes are directed to the microreaction technology. Microfluidic mixer is the most important component in microfluidic devices. Based on various principles, active and passive micromixers have been designed and investigated. This review is focused on the recent developments in microfluidic mixers. An overview of the flow phenomena and mixing characteristics in active and passive micromixers is presented, including the types of physical phenomena and their utilization in micromixers. Due to the simple fabrication technology and the easy implementation in a complex microfluidic system, T-micromixer is highlighted as an example to illustrate the effect of design and operating parameters on mixing efficiency and fuid flow inside microfluidic mixers.
基金the National Key Research and Development Program of China(Grant 2021YFA1501202,2022YFA1503600)the National Natural Science Foundation of China(Grant 22288101,21920102005)+3 种基金the‘111 Center’(B17020)the Natural Science Foundation of Jilin Province(SKL202402008)the China Postdoctoral Science Foundation(2023M731272)the Postdoctoral Fellowship Program of CPSF(GZB20230254)for supporting this work.
文摘In exploring fiber-based materials,the advantages of their inner constructions and displayed wettabilities diversify their applications and especially facilitate the development of immiscible liquid separation.When considering the basis of their liquid‒phase separation properties,such fibrous materials can be employed in more abundant and novel application fields in addition to oil-water separation.This article reviews the recent progress in the development of fiber-based materials with special surface wettabilities and further explores their potential in immiscible liquid separation-related fields,such as liquid/liquid mass transfer,and explores related applications in environmental purification,resource collection,energy storage and other fields.This article also explores the underlying nature that drives the wetting performance of fibrous surfaces,extends more diversified underliquid wetting models,and fully summarizes the separation mechanism and the latest corresponding applications,opening up an avenue for identifying the significance of devisable wetting performances and developing more diversified application potentials.Finally,this review proposes current challenges and expected developments in superwetting fiber-based materials with immiscible liquid separation abilities.
