The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Jacques Villermaux - One of the best experts on this subject based on the ideXlab platform.
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a new parallel Competing Reaction system for assessing micromixing efficiency determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.
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a new parallel Competing Reaction system for assessing micromixing efficiency experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.
Matthew J. Rosseinsky - One of the best experts on this subject based on the ideXlab platform.
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encapsulation of crabtree s catalyst in sulfonated mil 101 cr enhancement of stability and selectivity between Competing Reaction pathways by the mof chemical microenvironment
Angewandte Chemie, 2018Co-Authors: Alexios Grigoropoulos, Alasdair I. Mckay, Alexandros P. Katsoulidis, Robert P. Davies, Anthony Haynes, Lee Brammer, Jianliang Xiao, Andrew S. Weller, Matthew J. RosseinskyAbstract:Crabtree's catalyst was encapsulated inside the pores of the sulfonated MIL-101(Cr) metal-organic framework (MOF) by cation exchange. This hybrid catalyst is active for the heterogeneous hydrogenation of non-functionalized alkenes either in solution or in the gas phase. Moreover, encapsulation inside a well-defined hydrophilic microenvironment enhances catalyst stability and selectivity to hydrogenation over isomerization for substrates bearing ligating functionalities. Accordingly, the encapsulated catalyst significantly outperforms its homogeneous counterpart in the hydrogenation of olefinic alcohols in terms of overall conversion and selectivity, with the chemical microenvironment of the MOF host favouring one out of two Competing Reaction pathways.
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Encapsulation of Crabtree's Catalyst in Sulfonated MIL‐101(Cr): Enhancement of Stability and Selectivity between Competing Reaction Pathways by the MOF Chemical Microenvironment
Angewandte Chemie (International ed. in English), 2018Co-Authors: Alexios Grigoropoulos, Alasdair I. Mckay, Alexandros P. Katsoulidis, Robert P. Davies, Anthony Haynes, Lee Brammer, Jianliang Xiao, Andrew S. Weller, Matthew J. RosseinskyAbstract:Crabtree's catalyst was encapsulated inside the pores of the sulfonated MIL-101(Cr) metal-organic framework (MOF) by cation exchange. This hybrid catalyst is active for the heterogeneous hydrogenation of non-functionalized alkenes either in solution or in the gas phase. Moreover, encapsulation inside a well-defined hydrophilic microenvironment enhances catalyst stability and selectivity to hydrogenation over isomerization for substrates bearing ligating functionalities. Accordingly, the encapsulated catalyst significantly outperforms its homogeneous counterpart in the hydrogenation of olefinic alcohols in terms of overall conversion and selectivity, with the chemical microenvironment of the MOF host favouring one out of two Competing Reaction pathways.
M.-c. Fournier - One of the best experts on this subject based on the ideXlab platform.
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a new parallel Competing Reaction system for assessing micromixing efficiency determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.
-
a new parallel Competing Reaction system for assessing micromixing efficiency experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.
Alexios Grigoropoulos - One of the best experts on this subject based on the ideXlab platform.
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encapsulation of crabtree s catalyst in sulfonated mil 101 cr enhancement of stability and selectivity between Competing Reaction pathways by the mof chemical microenvironment
Angewandte Chemie, 2018Co-Authors: Alexios Grigoropoulos, Alasdair I. Mckay, Alexandros P. Katsoulidis, Robert P. Davies, Anthony Haynes, Lee Brammer, Jianliang Xiao, Andrew S. Weller, Matthew J. RosseinskyAbstract:Crabtree's catalyst was encapsulated inside the pores of the sulfonated MIL-101(Cr) metal-organic framework (MOF) by cation exchange. This hybrid catalyst is active for the heterogeneous hydrogenation of non-functionalized alkenes either in solution or in the gas phase. Moreover, encapsulation inside a well-defined hydrophilic microenvironment enhances catalyst stability and selectivity to hydrogenation over isomerization for substrates bearing ligating functionalities. Accordingly, the encapsulated catalyst significantly outperforms its homogeneous counterpart in the hydrogenation of olefinic alcohols in terms of overall conversion and selectivity, with the chemical microenvironment of the MOF host favouring one out of two Competing Reaction pathways.
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Encapsulation of Crabtree's Catalyst in Sulfonated MIL‐101(Cr): Enhancement of Stability and Selectivity between Competing Reaction Pathways by the MOF Chemical Microenvironment
Angewandte Chemie (International ed. in English), 2018Co-Authors: Alexios Grigoropoulos, Alasdair I. Mckay, Alexandros P. Katsoulidis, Robert P. Davies, Anthony Haynes, Lee Brammer, Jianliang Xiao, Andrew S. Weller, Matthew J. RosseinskyAbstract:Crabtree's catalyst was encapsulated inside the pores of the sulfonated MIL-101(Cr) metal-organic framework (MOF) by cation exchange. This hybrid catalyst is active for the heterogeneous hydrogenation of non-functionalized alkenes either in solution or in the gas phase. Moreover, encapsulation inside a well-defined hydrophilic microenvironment enhances catalyst stability and selectivity to hydrogenation over isomerization for substrates bearing ligating functionalities. Accordingly, the encapsulated catalyst significantly outperforms its homogeneous counterpart in the hydrogenation of olefinic alcohols in terms of overall conversion and selectivity, with the chemical microenvironment of the MOF host favouring one out of two Competing Reaction pathways.
Laurent Falk - One of the best experts on this subject based on the ideXlab platform.
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a new parallel Competing Reaction system for assessing micromixing efficiency determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.
-
a new parallel Competing Reaction system for assessing micromixing efficiency experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Experimental approach
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical Reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test Reactions is limited. We propose a new system of parallel Competing Reactions A + B → R and C + νB → S whereby the state of micromixing in industrial reactors can be studied. The first Reaction is a neutralization, the second one is the Dushman Reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed.
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A new parallel Competing Reaction system for assessing micromixing efficiency—Determination of micromixing time by a simple mixing model
Chemical Engineering Science, 1996Co-Authors: M.-c. Fournier, Laurent Falk, Jacques VillermauxAbstract:Abstract A system of parallel-Competing Reactions producing iodine was developed to study partial segregation in stirred tanks. The experimental results, obtained in 1 and 20 litre stirred tanks, are interpreted by the incorporation model, relating the micromixedness ratio, α, to the ratio of the Reaction time to micromixing time. The model being simple, the determination of the micromixing time can thus be used easily.