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Optimization of reaction conditions for the electroleaching of manganese from low-grade pyrolusite 被引量:1
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作者 Xing-ran Zhang Zuo-hua Liu +2 位作者 Xing Fan Xin Lian Chang-yuan Tao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第11期1121-1130,共10页
In the present study, a response surface methodology was used to optimize the electroleaching of Mn from low-grade pyrolusite. Ferrous sulfate heptahydrate was used in this reaction as a reducing agent in sulfuric aci... In the present study, a response surface methodology was used to optimize the electroleaching of Mn from low-grade pyrolusite. Ferrous sulfate heptahydrate was used in this reaction as a reducing agent in sulfuric acid solutions. The effect of six process variables, including the mass ratio of ferrous sulfate heptahydrate to pyrolusite, mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio, current density, leaching temperature, and leaching time, as well as their binary interactions, were modeled. The results revealed that the order of these factors with respect to their effects on the leaching efficiency were mass ratio of ferrous sulfate heptahydrate to pyrolusite 〉 leaching time 〉 mass ratio of sulfuric acid to pyrolusite 〉 liquid-to-solid ratio 〉 leaching temperature 〉 current density. The optimum conditions were as follows: 1.10:1 mass ratio of ferrous sulfate heptahydrate to pyrolusite, 0.9:1 mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio of 0.7:1, current density of 947 A/m^2, leaching time of 180 min, and leaching temperature of 73°C. Under these conditions, the predicted leaching efficiency for Mn was 94.1%; the obtained experimental result was 95.7%, which confirmed the validity of the model. 展开更多
关键词 pyrolusite manganese ore treatment electroleaching reaction conditions optimization
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Highly performed platinum nanosheets synthesized under in situ reaction conditions for hydrogen generation 被引量:1
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作者 Xiaobing Bao Yutong Gong +3 位作者 Xiaozhong Zheng Jiayi Chen Shanjun Mao Yong Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第12期272-279,共8页
Surface properties of a catalyst, especially exposed crystal facets and coordination states, directly affect the catalyst's performance. Herein, we illustrate how reaction conditions direct the fabrication of a we... Surface properties of a catalyst, especially exposed crystal facets and coordination states, directly affect the catalyst's performance. Herein, we illustrate how reaction conditions direct the fabrication of a wellbehaved catalyst with desired structures in the case of hydrogen evolution reaction(HER). Stable adsorbed PtClxions on CNTs are in situ electrochemically reduced into a unique Pt nanosheet structure enclosed by high-index(311) and low-index(200) and(111) facets during HER process. Experimental results and density functional theory(DFT) calculation disclose the function mechanism between these unique structures and reactants. The adsorbed H2 O and reactive species act as capping agents protecting the(311) facet where the dissociation of water molecule is promoted, and the produced H*intermediates favorably combine and release on the nearby low-index Pt sites. The joint collaborations of these active sites afford Pt nanosheets comparable activity to 20 wt% Pt/C and a 12.7-fold over mass activity. These findings provide novel insight into the synthesis of heterogeneous catalysts with high specificity. 展开更多
关键词 Pt nanosheet Crystal growth reaction condition Hydrogen evolution Heterogeneous catalysis
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STUDY ON THE ADDITION REACTION OF 1-IODO-4-CHLOROPERFLOROBUTANE TO 1-HEXENE UNDER REDUCTIVE CONDITIONS
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作者 Chang Ming HU Jian CHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第2期109-110,共2页
Promoted by various reductants,the addition of 1-iodo-4-chloro- perfluorobutane to 1-hexene giving 1:1 adduct is reported.Based on these facts,several new redox systems are proposed.
关键词 CHC STUDY ON THE ADDITION reaction OF 1-IODO-4-CHLOROPERFLOROBUTANE TO 1-HEXENE UNDER REDUCTIVE conditions Free RT
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Preparation of a highly efficient Pt/USY catalyst for hydrogenation and selective ring-opening reaction of tetralin 被引量:3
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作者 Qi Wang Zhang-Gui Hou +6 位作者 Bo Zhang Jian Liu Wei-Yu Song De-Sheng Xue Li-Zhi Liu Dong Wang Xin-Guo Chen 《Petroleum Science》 SCIE CAS CSCD 2018年第3期605-612,共8页
Ultrastable Y zeolite(USY)-supported Pt catalyst was prepared by gas-bubbling-assisted membrane reduction. The influence of reaction conditions and the metal and acid sites of catalysts on the catalytic performance ... Ultrastable Y zeolite(USY)-supported Pt catalyst was prepared by gas-bubbling-assisted membrane reduction. The influence of reaction conditions and the metal and acid sites of catalysts on the catalytic performance of catalyst in hydrogenation and selective ring opening of tetralin, 1,2,3,4-tetrahydronaphthalene(THN), was studied. It was found that the optimal reaction conditions were at a temperature of 280 °C, hydrogen pressure of 4 MPa, liquid hourly space velocity of 2 h^-1 and H2/THN ratio of 750. Under these optimal conditions, a high conversion of almost 100% was achieved on the 0.3 Pt/USY catalyst. XRD patterns and TEM images revealed that Pt particles were highly dispersed on the USY, favorable to the hydrogenation reaction of tetralin. Ammonia temperature-programmed desorption and Py-IR results indicated that the introduction of Pt can reduce the acid sites of USY, particularly the strong acid sites of USY. Thus, the hydrocracking reaction can be suppressed. 展开更多
关键词 Hydrogenation and selective ring opening reaction conditions Supported Pt catalyst TETRALIN
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Reaction condition optimization and kinetic investigation of roasting zinc oxide ore using (NH_4)_2SO_4 被引量:7
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作者 Hong-mei Shao Xiao-yi Shen +2 位作者 Yi Sun Yan Liu Yu-chun Zhai 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第10期1133-1140,共8页
An orthogonal test was used to optimize the reaction conditions of roasting zinc oxide ore using(NH_4)_2SO_4. The optimized reaction conditions are defined as an(NH_4)_2SO_4/zinc molar ratio of 1.4:1, a roasting ... An orthogonal test was used to optimize the reaction conditions of roasting zinc oxide ore using(NH_4)_2SO_4. The optimized reaction conditions are defined as an(NH_4)_2SO_4/zinc molar ratio of 1.4:1, a roasting temperature of 440°C, and a thermostatic time of 60 min. The molar ratio of(NH_4)_2SO_4/zinc is the most predominant factor and the roasting temperature is the second significant factor that governs the zinc extraction. Thermogravimetric-differential thermal analysis was used for(NH_4)_2SO_4 and zinc mixed in a molar ratio of 1.4:1 at the heating rates of 5, 10, 15, and 20 K·min-1. Two strong endothermic peaks indicate that the complex chemical reactions occur at approximately 290°C and 400°C. XRD analysis was employed to examine the transformations of mineral phases during roasting process. Kinetic parameters, including reaction apparent activation energy, reaction order, and frequency factor, were calculated by the Doyle-Ozawa and Kissinger methods. Corresponding to the two endothermic peaks, the kinetic equations were obtained. 展开更多
关键词 zinc ore treatment extractive metallurgy kinetic studies reaction mechanisms phase transformation reaction conditions
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Optimization of ISSR-PCR System and Conditions for Portulaca oleracea L.
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作者 Zhaoyun WANG Dongchen NA 《Agricultural Biotechnology》 CAS 2017年第4期23-24,42,共3页
With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oler... With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oleracea were Optimized. The results showed that there were 8 primers suitable for ISSR-PCR of P. oleracea. The optimal reaction system had a volume of 25 μl, including 2 x Taq Platinum PCR Master Mix 12.5 μl, primer 2 μl, ddH20 9.5 μl, and DNA template 1μl. The optimized ISSR-PCR of P. oleracea was started with pre-denaturation at 94 ℃ for 360 s, followed by 30 cycles of denaturation at 94 ℃ for 60 s, annealing at 54 ℃ for 60 s and extension at 72 ℃ for 90 s, and completed by extension at 72 ℃ for 300 s. 展开更多
关键词 Portulaca oleracea L. ISSR-PCR reaction system reaction conditions
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Construction of an operando dual-beam fourier transform infrared spectrometer and its application in the observation of isobutene reactions over nano-sized HZSM-5 zeolite 被引量:2
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作者 Jiaxu Liu Jilei Wang +4 位作者 Wei Zhou Cuilan Miao Guang Xiong Qin Xin Hongchen Guo 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第1期13-19,共7页
An operando dual‐beam Fourier transform infrared (DB‐FTIR) spectrometer was successfully developed using a facile method. The DB‐FTIR spectrometer is suitable for the real‐time study of the dynamic surface process... An operando dual‐beam Fourier transform infrared (DB‐FTIR) spectrometer was successfully developed using a facile method. The DB‐FTIR spectrometer is suitable for the real‐time study of the dynamic surface processes involved in gas/solid heterogeneous catalysis under real reaction conditionsbecause it can simultaneously collect reference and sample spectra. The influence of gas‐phasemolecular vibration and heat irradiation at real reaction temperatures can therefore be eliminated.The DB‐FTIR spectrometer was successfully used to follow the transformation of isobutene over nano‐sized HZSM‐5 zeolite under real reaction conditions. 展开更多
关键词 Operando DB‐FTIR Gas‐phase molecular vibration spectroscopy Heat irradiation influence Real‐time spectrum Real reaction condition Heterogeneous catalysis AROMATIZATION Nano‐sized HZSM‐5 zeolite
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A NOVEL DEHYDROGENATION REACTION UNDER SINGLET OXYGENATION CONDITION
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作者 Hiu Kwong LEUNG Yong Yue LIN Zhi Ming LIN 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第8期613-616,共4页
1-Aryl-2-merhy1-4,5-dihydropyrro1-3-carboxylic acid ethyl ester was observed to dehydrogenate to give 1-ary1-2-methyl-pyrro1-3-carboxylic acid ethyl ester upon irradiation in the presence of oxygen and in the presence... 1-Aryl-2-merhy1-4,5-dihydropyrro1-3-carboxylic acid ethyl ester was observed to dehydrogenate to give 1-ary1-2-methyl-pyrro1-3-carboxylic acid ethyl ester upon irradiation in the presence of oxygen and in the presence or absence of ms-tetraphenylporphine. 展开更多
关键词 TPP A NOVEL DEHYDROGENATION reaction UNDER SINGLET OXYGENATION CONDITION THAN
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Numerical study of homogeneous–heterogeneous reactions on stagnation point flow of ferrofluid with non-linear slip condition
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作者 Zaheer Abbas Mariam Sheikh 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第1期11-17,共7页
This study deals with the stagnation point flow of ferrofluid over a flat plate with non-linear slip boundary condition in the presence of homogeneous-heterogeneous reactions.Three kinds of ferroparticles,namely,magne... This study deals with the stagnation point flow of ferrofluid over a flat plate with non-linear slip boundary condition in the presence of homogeneous-heterogeneous reactions.Three kinds of ferroparticles,namely,magnetite(Fe_3O_4),cobalt ferrite(CoFe_2O_4) and manganese zinc ferrite(Mn-ZnFe_2O_4) are taken into account with water and kerosene as conventional base fluids.The developed model of homogeneous-heterogeneous reactions in boundary layer flow with equal and unequal diffusivities for reactant and autocatalysis is considered.The governing partial differential equations are converted into system of non-linear ordinary differential equations by mean of similarity transformations.These ordinary differential equations are integrated numerically using shooting method.The effects of pertinent parameters on velocity and concentration profiles are presented graphically and discussed.We found that in the presence of Fe_3O_4-kerosene and CoFe_2O_4-kerosene,velocity profiles increase for large values of α and β whereas there is a decrement in concentration profiles with increasing values of if and K_s.Furthermore,the comparison between non-magnetic(A1_2O_3) and magnetic Fe_3O_4 nanoparticles is given in tabular form. 展开更多
关键词 Ferrofluid Stagnation point flow Homogeneous-heterogeneous reactions Generalized slip boundary condition Numerical solution
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Regioselective tetrahydropyranylation of alcohols catalyzed by Fe(HSO_4)_3 被引量:4
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作者 Farhad Shirini Mohammad Ali Zolfigol Abdol-Reza Abri 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第7期803-806,共4页
Alcohols are selectively and efficiently protected as their tetrahydropranyl ethers in the presence of a catalytic amount of Fe(HSO4)3 in good to high yields. All reactions are performed under mild and completely he... Alcohols are selectively and efficiently protected as their tetrahydropranyl ethers in the presence of a catalytic amount of Fe(HSO4)3 in good to high yields. All reactions are performed under mild and completely heterogeneous reaction conditions. 展开更多
关键词 ALCOHOLS TETRAHYDROPYRANYLATION Tetrahydropyranyl ethers Fe(HSO4)3 Heterogeneous reaction conditions
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Experimental and mechanistic study on chemical looping combustion of caking coal 被引量:3
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作者 Xiuli Zhang Zhengdong Gao +3 位作者 Yongzhuo Liu Yuanhao Hou Xiaoqing Sun Qingjie Guo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第9期89-96,共8页
Under high-temperature batch fluidized bed conditions and by employing juye coal as the raw material,the present study determined the effects of the bed material,temperature,OC/C ratio,steam flow and oxygen carrier cy... Under high-temperature batch fluidized bed conditions and by employing juye coal as the raw material,the present study determined the effects of the bed material,temperature,OC/C ratio,steam flow and oxygen carrier cycle on the chemical looping combustion of coal.In addition,the variations taking place in the surface functional groups of coal under different reaction times were investigated,and the variations achieved by the gas released under the pyrolysis and combustion of Juye coal were analyzed.As revealed from the results,the carbon conversion ratio and rate were elevated significantly,and the volume fraction of the outlet CO_(2)remained more than 92%under the oxygen carriers.The optimized reaction conditions to achieve the chemical looping combustion of Juye coal consisted of a temperature of 900℃,an OC/C ratio of 2,as well as a steam flow rate of 0.5 g·min^(-1).When the coal was undergoing the chemical looping combustion,volatiles primarily originated from the pyrolysis of aliphatic-CH_(3)and-CH_(2),and CO and H_(2)were largely generated from the gasification of aromatic carbon.In the CLC process,H_(2)O and CO_(2)began to separate out at 270℃,CH4 and tar began to precipitate at 370℃,and the amount of CO_(2)was continuously elevated with the rise of the temperature. 展开更多
关键词 Caking coal Chemical looping combustion Optimized reaction conditions
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Silica sulfuric acid:A versatile reagent for oxathioacetalyzation of carbonyl compounds and deprotection of 1,3-oxathiolanes 被引量:2
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作者 Farhad Shirini Parisa Sadeghzadeh Masoumeh Abedini 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第12期1457-1460,共4页
Oxathioacetalyzation of carbonyl compounds with 2-mercaptoethanol and deprotection of the obtained 1,3-oxathiolanes is easily performed in the presence of silica sulfuric acid (SSA). All reactions were performed und... Oxathioacetalyzation of carbonyl compounds with 2-mercaptoethanol and deprotection of the obtained 1,3-oxathiolanes is easily performed in the presence of silica sulfuric acid (SSA). All reactions were performed under mild and completely heterogeneous reaction conditions in good to high yields. 展开更多
关键词 Silica sulfuric acid Oxathioacetalyzation 1 3-Oxathiolane Heterogeneous reaction conditions Carbonyl compounds
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Silica triflate as an efficient reagent for the solvent-free synthesis of coumarins 被引量:1
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作者 Farhad Shirini Katayoun Marjani +1 位作者 Hossein Taherpour Nahzomi Mohammad Ali Zolfigol 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第8期909-911,共3页
Silica triflate, as a new silica-based reagent, can be used for the efficient synthesis of 4-substituted coumarins via a Pechmann reaction under solvent-free reaction conditions. All reactions were performed at 80 ℃ ... Silica triflate, as a new silica-based reagent, can be used for the efficient synthesis of 4-substituted coumarins via a Pechmann reaction under solvent-free reaction conditions. All reactions were performed at 80 ℃ in good to high yields. 展开更多
关键词 Silica triflate COUMARINS Pechmann reaction Solvent-free reaction conditions PHENOLS
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Process optimization study on the carbonylation of methyl acetate 被引量:1
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作者 Baohe Wang Baomin Ge +1 位作者 Jing Zhu Lina Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第9期1937-1942,共6页
Acetic anhydride is the important organic chemical raw material, and is used widely in chemical industry,pharmaceutical industry, dyes, spices and other fields. In this paper, the process of carbonylation of methyl ac... Acetic anhydride is the important organic chemical raw material, and is used widely in chemical industry,pharmaceutical industry, dyes, spices and other fields. In this paper, the process of carbonylation of methyl acetate in rhodium iodine catalyst system was studied, and the suitable reaction conditions were determined.At the same time, the kinetic model was established. The optimum reaction conditions were as follows: the reaction pressure was 5 MPa, the hydrogen content was 8%, the amount of iodomethane was 15%, the amount of lithium iodide was 3%, the reaction temperature was 150 ℃ and the reaction time is 3 h. Under the above reaction conditions, the selectivity of the reaction is close to 100% and the conversion is as high as 92%. The macroscopic kinetic model of the reaction was established in the temperature range of 120 ℃–150 ℃. The reaction is an irreversible reaction without the formation of by-products and the dynamic equation is also given in the Conclusions section. 展开更多
关键词 CARBONYLATION Rhodium iodine catalyst reaction conditions KINETICS
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A mild and efficient method for the methoxymethylation and acetylation of alcohols promoted by benzyltriphenylphosphonium tribromide
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作者 Farhad Shirini Gholam Hossein Imanzadeh +2 位作者 Seyyed Ali Reza Mousazadeh Iraj Mohammadpoor-Baltork Masoumeh Abedin 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第10期1187-1190,共4页
A mild and efficient method for the conversion of alcohols to their corresponding methoxymethyl ethers and acetates using benzyltriphenylphosphonium tribromide (BTPTB) as catalyst is described. All reactions were pe... A mild and efficient method for the conversion of alcohols to their corresponding methoxymethyl ethers and acetates using benzyltriphenylphosphonium tribromide (BTPTB) as catalyst is described. All reactions were performed under completely heterogeneous reaction conditions in good to high yields. 展开更多
关键词 Benzyltriphenylphosphonium tribromide ALCOHOLS Methoxymethylation ACETYLATION Heterogeneous reaction conditions
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Synthesis of Dimethyl-2,6-Naphthalene Dicarboxylate by Esterification Catalyzed by Sodium Tungstate
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作者 夏清 马沛生 蒋仕明 《Transactions of Tianjin University》 EI CAS 2004年第2期149-152,共4页
The process of synthesis of dimethyl-2,6-naphthalene dicaboxylate from esterification of 2,6-naphthalene dicarboxylic acid (2,6-NDCA) by methanol using sodium tungstate as catalyst was investigated. The orthogonal tes... The process of synthesis of dimethyl-2,6-naphthalene dicaboxylate from esterification of 2,6-naphthalene dicarboxylic acid (2,6-NDCA) by methanol using sodium tungstate as catalyst was investigated. The orthogonal tests method was used for optimizing the process factors. The effects of reaction temperature, mass percentage of catalyst, reaction time and mass ratio of methanol to 2,6-NDCA on the 2,6-NDCA conversion were investigated. It was found that all the four factors had significant effect on the conversion. The optimum reaction conditions were reaction temperature 215 ℃,mass percentage of catalyst 3%, reaction time 3 h, mass ratio of methanol to 2,6-NDCA 6∶1. The 2,6-NDCA conversion at above condition was 92.80%. 展开更多
关键词 naphthalene dicarboxylic acid(2 6-NDCA) dimethyl-2 6-naphthalene dicaboxylate sodium tungstate catalyst optimum reaction conditions
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A New Index Developed for Fast Diagnosis of Meteorological Roles in Ground-Level Ozone Variations 被引量:3
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作者 Weihua CHEN Weiwen WANG +11 位作者 Shiguo JIA Jingying MAO Fenghua YAN Lianming ZHENG Yongkang WU Xingteng ZHANG Yutong DONG Lingbin KONG Buqing ZHONG Ming CHANG Min SHAO Xuemei WANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2022年第3期403-414,558-563,共18页
China experienced worsening ground-level ozone(O_(2)) pollution from 2013 to 2019. In this study, meteorological parameters, including surface temperature(T_(2)), solar radiation(SW), and wind speed(WS), were classifi... China experienced worsening ground-level ozone(O_(2)) pollution from 2013 to 2019. In this study, meteorological parameters, including surface temperature(T_(2)), solar radiation(SW), and wind speed(WS), were classified into two aspects,(1) Photochemical Reaction Condition(PRC = T_(2)× SW) and(2) Physical Dispersion Capacity(PDC = WS). In this way, a Meteorology Synthetic Index(MSI = PRC/PDC) was developed for the quantification of meteorology-induced ground-level O_(2)pollution. The positive linear relationship between the 90 th percentile of MDA8(maximum daily 8-h average) O_(2)concentration and MSI determined that the contribution of meteorological changes to ground-level O-3 varied on a latitudinal gradient, decreasing from ~40% in southern China to 10%–20% in northern China. Favorable photochemical reaction conditions were more important for ground-level O_(2)pollution. This study proposes a universally applicable index for fast diagnosis of meteorological roles in ground-level O_(2)variability, which enables the assessment of the observed effects of precursor emissions reductions that can be used for designing future control policies. 展开更多
关键词 ground-level ozone meteorology synthetic index photochemical reaction condition physical dispersion capacity
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Characterization and catalytic performance of CeO_2-Co/SiO_2 catalyst for Fischer-Tropsch synthesis using nitrogen-diluted synthesis gas over a laboratory scale fixed-bed reactor 被引量:2
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作者 Xiaoping Dai Changchun Yu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2008年第1期17-23,共7页
The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method. The results indicated that the formation of H2O... The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method. The results indicated that the formation of H2O and CO2 was the competitive reaction for the surface oxygen species, CH4 was produced via the hydrogenation of carbon species step by step, and C2 products were formed by the polymerization of surface-active carbon species (-CH2-). Hydrogen assisted the dissociation of CO. The hydrogenation of surface carbon species was the rate-limiting step in the hydrogenation of CO over CeO2-Co/SiO2 catalyst. The investigation of total pressure, gas hourly space velocity (GHSV), and product distribution using nitrogen-rich synthesis gas as feedstock over a laboratory scale fixed-bed reactor indicated that total pressure and GHSV had a significant effect on the catalytic performance of CeO2-Co/SiO2 catalyst. The removal of heat and control of the reaction temperature were extremely critical steps, which required lower GHSV and appropriate CO conversion to avoid the deactivation of the catalyst. The feedstock of nitrogen-rich synthesis gas was favorable to increase the conversion of CO, but there was a shift of product distribution toward the light hydrocarbon. The nitrogen-rich synthesis gas was feasible for F-T synthesis for the utilization of remote natural gas. 展开更多
关键词 CeO2-Co/SiO2 catalyst Fischer-Tropsch synthesis surface species reaction condition nitrogen-rich synthesis gas product distribution
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Synthesis of ethylidene diacetate from dimethyl ether,CO and H_2 被引量:2
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作者 Dianhua Liu Xin Huang +3 位作者 Lei Hu Dingye Fang Weiyong Ying Dasheng Chen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第2期165-168,共4页
Ethylidene diacetate was prepared by reacting dimethyl ether,acetic acid and syngas in the presence of a catalytic system comprising RhI3,PPh3 and CH3I.The effects of reaction temperature,pressure,time and the CO/H2 m... Ethylidene diacetate was prepared by reacting dimethyl ether,acetic acid and syngas in the presence of a catalytic system comprising RhI3,PPh3 and CH3I.The effects of reaction temperature,pressure,time and the CO/H2 molar ratio on the conversion of dimethyl ether and the product selectivity were investigated under the same catalyst formulation.Results showed that a maximum conversion of dimethyl ether was obtained when a mixture consisting of 0.3 mol dimethyl ether and 120 ml acetic acid was reacted at 180 ℃ and 3.0 MPa for 10 h at a stirring speed of 600 rpm under a syngas flow with a CO/H2 molar ratio of 2.5,which was catalyzed by a catalyst mixture comprising 0.3 g RhI3,6 g PPh3 and 1.3 g CH3I.The selectivity of ethylidene diacetate increased with temperature,decreased with the CO/H2 molar ratio and exhibited a maximum with pressure. 展开更多
关键词 dimethyl ether CARBONYLATION ethylidene diacetate reaction condition
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[Bmim]OAc Catalyzed Michael Addition of Active Methylene to α,β-Unsaturated Carboxylic Esters and Nitriles 被引量:2
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作者 YANG Yu WANG Li-bing ZHANG Zhan LI Cai-meng FU Xian-lei GAO Guo-hua 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第4期554-557,共4页
Michael addition of active methylene compounds to α,β-unsaturated carboxylic esters and nitriles was effectively catalyzed by a basic ionic liquid, 1-butyl-3-methylimidazolium acetate([Bmim]OAc). The his-addition ... Michael addition of active methylene compounds to α,β-unsaturated carboxylic esters and nitriles was effectively catalyzed by a basic ionic liquid, 1-butyl-3-methylimidazolium acetate([Bmim]OAc). The his-addition products were selectively obtained in high yields under mild reaction conditions. 展开更多
关键词 Michael addition [Bmim]OAc Bis-addition Mild reaction condition
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