The Experts below are selected from a list of 2421 Experts worldwide ranked by ideXlab platform
Yong-fei Li - One of the best experts on this subject based on the ideXlab platform.
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Highly selective synthesis For 4,4′-Bisphenol F From phenol and Formaldehyde catalyzed with [C4mim][HSO4] ionic liquid ☆
Chinese Journal of Chemical Engineering, 2016Co-Authors: Danfeng Wang, Zhicheng He, Zhimin Wu, Yong-fei LiAbstract:Abstract The eFFects oF N -methylimidazole cation [C n mim] with diFFerent alkyl chain lengths, the types oF cations and anions oF ionic liquids and the reaction parameters on the catalytic activity and the selectivity For 4,4′-Bisphenol F were investigated. The hydrogen bonding between the hydroxyl oF phenol and the C2-position hydrogen oF imidazole moiety in hydrophilic imidazole-based ionic liquid has important inFluence on the selectivity For 4,4′-Bisphenol F, and under the conditions oF the molar ratio oF phenol/[C 4 mim][HSO 4 ] 1:1, reaction temperature 65 °C and the theoretical molar ratio oF phenol/Formaldehyde 2:1, the selectivity For 4,4′-Bisphenol F reached 69.1%. Compared with the high phenol/Formaldehyde ratio reported in literatures, the low molar ratio oF phenol/Formaldehyde and the low reaction temperature can greatly reduce energy consumption, and has important signiFicance For industrial application.
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short channeled mesoporous zr al sba 15 as a highly eFFicient catalyst For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F
Chemical Engineering Journal, 2016Co-Authors: Yong-fei Li, Zhimin WuAbstract:Abstract Short-channeled Zr–Al-SBA-15 catalysts with well-ordered mesostructures were prepared by a one-pot hydrothermal synthesis method under mild acidic condition, and their catalytic activities were tested in the hydroxyalkylation oF phenol with Formaldehyde. The physicochemical characteristics oF the catalysts were characterized by XRD, SEM, TEM, pyridine FTIR, and N 2 adsorption–desorption isotherm techniques. By using this catalyst, an eFFicient and environmentally benign process For the synthesis oF Bisphenol F in a heterogeneous manner was developed. Compared with the conventional Al-SBA-15 catalysts, the short-channeled Zr–Al-SBA-15 exhibited higher catalytic activity and reusability in hydroxyalkylation oF phenol because its short channels can eFFectively reduce the molecular diFFusion resistance and avoid pore block. Under the optimum hydroxyalkylation conditions (phenol/Formaldehyde molar ratio 30:1, catalyst concentration 0.004 g/cm 3 , reaction temperature 90 °C and reaction time 60 min), a high Bisphenol F yield oF 96.1% could be achieved over the short-channeled Zr–Al-SBA-15 catalyst. A kinetic model For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F has been developed.
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hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F catalyzed by keggin phosphotungstic acid encapsulated in metal organic Frameworks mil 100 Fe or cr and mil 101 Fe or cr
Industrial & Engineering Chemistry Research, 2015Co-Authors: Meng Chen, Yong-fei Li, Zhimin WuAbstract:Hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was investigated over the metal–organic Frameworks oF MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with diFFerent β values (the molar ratio oF W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most eFFective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity For Bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The eFFects oF the reaction time, reaction temperature, catalyst concentration, and phenol/Formaldehyde molar ratio on the reaction perFormance were also investigated. A plausible mechanism For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was proposed.
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Hydroxyalkylation oF Phenol with Formaldehyde to Bisphenol F Catalyzed by Keggin Phosphotungstic Acid Encapsulated in Metal–Organic Frameworks MIL-100(Fe or Cr) and MIL-101(Fe or Cr)
Industrial & Engineering Chemistry Research, 2015Co-Authors: Meng Chen, Yong-fei Li, Zhimin WuAbstract:Hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was investigated over the metal–organic Frameworks oF MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with diFFerent β values (the molar ratio oF W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most eFFective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity For Bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The eFFects oF the reaction time, reaction temperature, catalyst concentration, and phenol/Formaldehyde molar ratio on the reaction perFormance were also investigated. A plausible mechanism For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was proposed.
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the hydroxyalkylation oF phenol with Formaldehyde over mesoporous m al zr al zr sba 15 catalysts the eFFect on the isomer distribution oF Bisphenol F
Catalysis Communications, 2015Co-Authors: Yong-fei Li, Zhimin WuAbstract:Abstract Mesoporous M(Al, Zr, Al–Zr)-SBA-15 catalysts prepared by a direct method were used For the hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F in the presence oF water. The results showed that M(20)-SBA-15 with the Si/M molar ratio oF 20 exhibited higher catalytic activity. The isomer distribution oF Bisphenol F could be regulated in the hydroxyalkylation oF phenol with Formaldehyde by changing the Al/Zr ratio in M(20)-SBA-15 catalysts. Al(20)-SBA-15 was in Favor oF the Formation oF 4,4′-isomer, whereas Zr(20)-SBA-15 was in Favor oF the Formation oF 2,4′- and 2,2′-isomers.
Zhimin Wu - One of the best experts on this subject based on the ideXlab platform.
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Highly selective synthesis For 4,4′-Bisphenol F From phenol and Formaldehyde catalyzed with [C4mim][HSO4] ionic liquid ☆
Chinese Journal of Chemical Engineering, 2016Co-Authors: Danfeng Wang, Zhicheng He, Zhimin Wu, Yong-fei LiAbstract:Abstract The eFFects oF N -methylimidazole cation [C n mim] with diFFerent alkyl chain lengths, the types oF cations and anions oF ionic liquids and the reaction parameters on the catalytic activity and the selectivity For 4,4′-Bisphenol F were investigated. The hydrogen bonding between the hydroxyl oF phenol and the C2-position hydrogen oF imidazole moiety in hydrophilic imidazole-based ionic liquid has important inFluence on the selectivity For 4,4′-Bisphenol F, and under the conditions oF the molar ratio oF phenol/[C 4 mim][HSO 4 ] 1:1, reaction temperature 65 °C and the theoretical molar ratio oF phenol/Formaldehyde 2:1, the selectivity For 4,4′-Bisphenol F reached 69.1%. Compared with the high phenol/Formaldehyde ratio reported in literatures, the low molar ratio oF phenol/Formaldehyde and the low reaction temperature can greatly reduce energy consumption, and has important signiFicance For industrial application.
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short channeled mesoporous zr al sba 15 as a highly eFFicient catalyst For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F
Chemical Engineering Journal, 2016Co-Authors: Yong-fei Li, Zhimin WuAbstract:Abstract Short-channeled Zr–Al-SBA-15 catalysts with well-ordered mesostructures were prepared by a one-pot hydrothermal synthesis method under mild acidic condition, and their catalytic activities were tested in the hydroxyalkylation oF phenol with Formaldehyde. The physicochemical characteristics oF the catalysts were characterized by XRD, SEM, TEM, pyridine FTIR, and N 2 adsorption–desorption isotherm techniques. By using this catalyst, an eFFicient and environmentally benign process For the synthesis oF Bisphenol F in a heterogeneous manner was developed. Compared with the conventional Al-SBA-15 catalysts, the short-channeled Zr–Al-SBA-15 exhibited higher catalytic activity and reusability in hydroxyalkylation oF phenol because its short channels can eFFectively reduce the molecular diFFusion resistance and avoid pore block. Under the optimum hydroxyalkylation conditions (phenol/Formaldehyde molar ratio 30:1, catalyst concentration 0.004 g/cm 3 , reaction temperature 90 °C and reaction time 60 min), a high Bisphenol F yield oF 96.1% could be achieved over the short-channeled Zr–Al-SBA-15 catalyst. A kinetic model For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F has been developed.
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hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F catalyzed by keggin phosphotungstic acid encapsulated in metal organic Frameworks mil 100 Fe or cr and mil 101 Fe or cr
Industrial & Engineering Chemistry Research, 2015Co-Authors: Meng Chen, Yong-fei Li, Zhimin WuAbstract:Hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was investigated over the metal–organic Frameworks oF MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with diFFerent β values (the molar ratio oF W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most eFFective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity For Bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The eFFects oF the reaction time, reaction temperature, catalyst concentration, and phenol/Formaldehyde molar ratio on the reaction perFormance were also investigated. A plausible mechanism For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was proposed.
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Hydroxyalkylation oF Phenol with Formaldehyde to Bisphenol F Catalyzed by Keggin Phosphotungstic Acid Encapsulated in Metal–Organic Frameworks MIL-100(Fe or Cr) and MIL-101(Fe or Cr)
Industrial & Engineering Chemistry Research, 2015Co-Authors: Meng Chen, Yong-fei Li, Zhimin WuAbstract:Hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was investigated over the metal–organic Frameworks oF MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with diFFerent β values (the molar ratio oF W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most eFFective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity For Bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The eFFects oF the reaction time, reaction temperature, catalyst concentration, and phenol/Formaldehyde molar ratio on the reaction perFormance were also investigated. A plausible mechanism For hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F was proposed.
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the hydroxyalkylation oF phenol with Formaldehyde over mesoporous m al zr al zr sba 15 catalysts the eFFect on the isomer distribution oF Bisphenol F
Catalysis Communications, 2015Co-Authors: Yong-fei Li, Zhimin WuAbstract:Abstract Mesoporous M(Al, Zr, Al–Zr)-SBA-15 catalysts prepared by a direct method were used For the hydroxyalkylation oF phenol with Formaldehyde to Bisphenol F in the presence oF water. The results showed that M(20)-SBA-15 with the Si/M molar ratio oF 20 exhibited higher catalytic activity. The isomer distribution oF Bisphenol F could be regulated in the hydroxyalkylation oF phenol with Formaldehyde by changing the Al/Zr ratio in M(20)-SBA-15 catalysts. Al(20)-SBA-15 was in Favor oF the Formation oF 4,4′-isomer, whereas Zr(20)-SBA-15 was in Favor oF the Formation oF 2,4′- and 2,2′-isomers.
Seitaro Namba - One of the best experts on this subject based on the ideXlab platform.
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selective synthesis oF Bisphenol F catalyzed by microporous h beta zeolite
Applied Catalysis A-general, 2005Co-Authors: Suman K. Jana, Tsuyoshi Kugita, Takeshi Okamoto, Seitaro NambaAbstract:Abstract The Bisphenol F synthesis From the liquid-phase phenol and Formaldehyde condensation reaction in the presence oF water over microporous H-beta zeolites, with diFFerent Si/Al ratios, has been investigated. The catalysts have been characterized For their phase purity and acidity. With an increase in the aluminum content in beta zeolite, the acidity is increased gradually; however, the catalytic activity is increased and passes through a maximum. Among the diFFerent Al-containing beta zeolites (having Si/Al ratios From 11.5 to 124.5 mol mol −1 ), the catalyst with Si/Al ratio oF 75.0 mol mol −1 shows the best catalytic perFormance in the Bisphenol F synthesis process. The inFluences oF catalyst amount, phenol/Formaldehyde ratio and reaction temperature on the phenol and Formaldehyde condensation over the catalyst showing the highest Bisphenol F activity have been thoroughly studied.
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aluminum graFted mcm 41 molecular sieve an active catalyst For Bisphenol F synthesis process
Applied Catalysis A-general, 2004Co-Authors: Suman K. Jana, Tsuyoshi Kugita, Seitaro NambaAbstract:Abstract Liquid-phase Bisphenol F synthesis From phenol and Formaldehyde condensation reaction in the presence oF water has been investigated over mesoporous Al:MCM-41 catalysts, with diFFerent Si/Al ratios, prepared by a post-synthesis graFting method. The catalysts have been characterized For their phase purity, surFace area, average pore diameter and acidity. Introduction oF Al into the Framework oF MCM-41 increased the acidity; however, the increase in the acidity only up to a certain level increased the acid-catalyzed phenol and Formaldehyde condensation activity. Among the diFFerent Al-graFted MCM-41 molecular sieves (having Si/Al ratios From 15 to 200 mol mol −1 ), Al:MCM-41 having a Si/Al ratio oF 70 mol mol −1 shows the best catalytic perFormance in the Bisphenol F synthesis process.
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Bisphenol F Synthesis Over Mesoporous Aluminosilicate MCM-41 Molecular Sieves
Catalysis Letters, 2003Co-Authors: Suman K. Jana, Tsuyoshi Kugita, Seitaro NambaAbstract:Liquid-phase Bisphenol F synthesis From phenol and Formaldehyde condensation reaction in the presence oF water over mesoporous aluminosilicate MCM-41 catalysts (Si/Al = 50 mol mol^-1) prepared by Four diFFerent methods: sol–gel, hydrothermal, graFting and template-cation exchange at 90 °C has been investigated. The aluminum-incorporated MCM-41 samples prepared by diFFerent methods showed high activity in the Bisphenol F synthesis process. However, the procedure oF Al introduction into the Framework oF MCM-41 determines their catalytic activity in the acid-catalyzed phenol and Formaldehyde reaction. The Al:MCM-41 prepared by graFting method exhibits the highest activity in the Bisphenol F synthesis process.
Jemkun Chen - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties oF Bisphenol F based boron phenolic resin modiFied silicon nitride composites and their usage as binders For grinding wheels
Applied Surface Science, 2015Co-Authors: Jemkun ChenAbstract:Abstract In this study, phenolic resins based on Bisphenol-F (BPF) were synthesized. Besides, ammonium borate was added in the synthesis process oF BPF to Form the Bisphenol-F based boron-phenolic resins (B-BPF). The glass transition temperature, thermal resistance, Flexural strength and hardness oF B-BPF are respectively higher than those oF BPF. This is due to the presence oF new cross-link B O bonds in the B-BPF. In addition, the 3-aminopropyltriethoxysilane modiFied silicon nitride powders (m-SiN) were Fully mixed with B-BPF to Form the B-BPF/m-SiN composites. The thermal resistance and mechanical properties oF the B-BPF/m-SiN are promoted by the well-dispersed and well-adhered m-SiN in these novel polymer/ceramics composites. The results oF grinding experiments indicate that the grinding wheels bound by the B-BPF/m-SiN have better grinding quality than those bound by the BPF. Thus the B-BPF/m-SiN composites are better binding media than the BPF resins.
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Preparation and properties oF Bisphenol-F based boron-phenolic resin/modiFied silicon nitride composites and their usage as binders For grinding wheels
Applied Surface Science, 2015Co-Authors: Jemkun ChenAbstract:Abstract In this study, phenolic resins based on Bisphenol-F (BPF) were synthesized. Besides, ammonium borate was added in the synthesis process oF BPF to Form the Bisphenol-F based boron-phenolic resins (B-BPF). The glass transition temperature, thermal resistance, Flexural strength and hardness oF B-BPF are respectively higher than those oF BPF. This is due to the presence oF new cross-link B O bonds in the B-BPF. In addition, the 3-aminopropyltriethoxysilane modiFied silicon nitride powders (m-SiN) were Fully mixed with B-BPF to Form the B-BPF/m-SiN composites. The thermal resistance and mechanical properties oF the B-BPF/m-SiN are promoted by the well-dispersed and well-adhered m-SiN in these novel polymer/ceramics composites. The results oF grinding experiments indicate that the grinding wheels bound by the B-BPF/m-SiN have better grinding quality than those bound by the BPF. Thus the B-BPF/m-SiN composites are better binding media than the BPF resins.
Richard Klinger - One of the best experts on this subject based on the ideXlab platform.
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Bisphenol F in SenF: Aktueller Wissensstand und Nachweis mittels LC-MS/MS
Journal of Consumer Protection and Food Safety, 2017Co-Authors: Daniela Reger, Melanie Pavlovic, Michaela Pietschmann-keck, Richard KlingerAbstract:Beside the well characterized Bisphenol A, Bisphenol F was recently detected in FoodstuFF (mustard). In this study, the Formation mechanism oF Bisphenol F From sinalbin was veriFied. AFter optimizing the LC–MS/MS- method, the appearance oF the diFFerent Bisphenol F-isomers in various mustard samples were evaluated. The highest concentrations were Found in medium hot mustard, the lowest were Found in hot mustard. In all samples, 4,4′-Bisphenol F was quantiFied as the most Frequent isomer. Only a Few mustard samples showed 2,4′-Bisphenol F in low concentrations. Zusätzlich zu dem inzwischen sehr gut untersuchten Bisphenol A konnte kürzlich auch Bisphenol F in Lebensmitteln (SpeisesenF) nachgewiesen werden. Basierend auF dem postulierten Bildungsmechanismus von Bisphenol F nach Zoller et al. (Food Addit Contam Part A 33(1):137–146, 2016 ) aus Sinalbin wurden Untersuchungen zur Entstehung von Bisphenol F durchgeFührt. Nach Optimierung der LC-MS/MS-Untersuchungsmethode konnten in gängigen SpeisesenFen die Gehalte verschiedener Bisphenol F-Isomere bestimmt werden. Die höchsten Gehalte wiesen mittelscharFe SpeisesenFe auF, die niedrigsten scharFe SenFe. Dabei war immer 4,4′-Bisphenol F das Hauptisomer. Nur in wenigen Proben wurden geringe Mengen an 2,4′-Bisphenol F geFunden.
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Bisphenol F in SenF: Aktueller Wissensstand und Nachweis mittels LC-MS/MS
Journal fur Verbraucherschutz und Lebensmittelsicherheit-Journal of Consumer, 2017Co-Authors: Daniela Reger, Melanie Pavlovic, Michaela Pietschmann-keck, Richard KlingerAbstract:Zusatzlich zu dem inzwischen sehr gut untersuchten Bisphenol A konnte kurzlich auch Bisphenol F in Lebensmitteln (SpeisesenF) nachgewiesen werden. Basierend auF dem postulierten Bildungsmechanismus von Bisphenol F nach Zoller et al. (Food Addit Contam Part A 33(1):137–146, 2016) aus Sinalbin wurden Untersuchungen zur Entstehung von Bisphenol F durchgeFuhrt. Nach Optimierung der LC-MS/MS-Untersuchungsmethode konnten in gangigen SpeisesenFen die Gehalte verschiedener Bisphenol F-Isomere bestimmt werden. Die hochsten Gehalte wiesen mittelscharFe SpeisesenFe auF, die niedrigsten scharFe SenFe. Dabei war immer 4,4′-Bisphenol F das Hauptisomer. Nur in wenigen Proben wurden geringe Mengen an 2,4′-Bisphenol F geFunden.