The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Sasanka Deka - One of the best experts on this subject based on the ideXlab platform.
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introducing nanocrystalline ceo2 as heterogeneous environmental friendly catalyst for the aerobic oxidation of para xylene to Terephthalic Acid in water
Journal of Materials Chemistry, 2013Co-Authors: Kalyanjyoti Deori, Satish Kumar Awasthi, Dinesh Gupta, Basudeb Saha, Sasanka DekaAbstract:CeO2 nanoparticles exposed in (100) and (111) surfaces have been synthesized and explored as a heterogeneous catalyst for the first time in the oxidation of para-xylene to Terephthalic Acid. The synthesis and catalysis reaction was environmental friendly, where water was used as the solvent. Ceria nanoparticles were synthesized with controlled size of 15 nm and high surface area of 268 m2 g−1 magnitude. These particles were exploited as a novel heterogeneous catalyst for aqueous phase oxidation of para-xylene to bypass all the hazardous steps involve in the manufacture of industrially important Terephthalic Acid. The result shows the formation of 30–40% Terephthalic Acid under mild reaction condition, i.e. at 70 °C in water, by avoiding the corrosive bromide promoter and acetic Acid solvent. The recyclability studies reveal that the recovered ceria catalyst retained its activity in para-xylene conversion without the change in the fluorite crystal structure, crystallite size and morphology of CeO2. At last, a radical mechanism for this particular catalytic activity of the catalysis reaction has been proposed based on the high surface area and the corresponding available exposed active (100) and (111) surfaces.
Chengfei Li - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Simulation and Analysis of Industrial Purified Terephthalic Acid Solvent Dehydration Process
Chinese Journal of Chemical Engineering, 2011Co-Authors: Chengfei LiAbstract:Abstract Dynamic model for dehydration process of industrial purified Terephthalic Acid solvent is investigated to understand and characterize the process. A temperature differential expression is presented, which ensures the equation to convergence and short computation time. The model is used to study the dynamic behavior of an azeotropic distillation column separating acetic Acid and water using n-butyl acetate as the entrainer. Responses of the column to feed flow and aqueous reflux flow are simulated. The movement of temperature front is also simulated. The comparison between simulation and industrial values shows that the model and algorithm are effective. On the basis of simulation and analysis, control strategy, online optimization and so on can be implemented effectively in dehydration process of purified Terephthalic Acid solvent.
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CSIE (7) - Fuzzy Multi-objective Particle Swarm Optimization Algorithm Using Industrial Purified Terephthalic Acid Solvent Dehydration Process
2009 WRI World Congress on Computer Science and Information Engineering, 2009Co-Authors: Chengfei Li, Deming ZuoAbstract:In this paper, a fuzzy multi-objective Particle Swarm Optimization (MOPSO) based on Pareto dominance hybrid algorithm is investigated and applied in industrial Purified Terephthalic Acid (called PTA) solvent dehydration Process for the first time. Pareto dominance and fuzzy decision making are incorporated into particle swarm optimization. Our algorithm takes fuzzy Pareto set as repository of particles that is later used by other particles to guide their own flight. Additionally, an MOPSO and PTA hybrid model is applied in the operation optimization of industrial Purified Terephthalic Acid solvent dehydration process. From both theoretical computation and practical application, the validity and reliability of proposed algorithm are verified by two test functions studied, and actual application example of the optimization of operation parameter of industrial Purified Terephthalic Acid solvent dehydration process. In this study, a comprehensive model for an industrial Purified Terephthalic Acid solvent dehydration process is presented. The model parameters are tuned using industrial data. Complete details of the model are provided. Thereafter, a two-objective optimization of this PTA is performed; the concentrations of the acetic Acid concentration in the tower bottom is maximized while the concentrations of the acetic Acid concentration in the tower top is minimized. ThePareto solution of the fuzzy MOPSO is near the Pareto front.
Bernhardt L Trout - One of the best experts on this subject based on the ideXlab platform.
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surface mediated nucleation in the solid state polymorph transformation of Terephthalic Acid
Journal of the American Chemical Society, 2007Co-Authors: Gregg T Beckham, Baron Peters, Cindy Starbuck, Narayan Variankaval, Bernhardt L TroutAbstract:A molecular mechanism for nucleation for the solid-state polymorph transformation of Terephthalic Acid is presented. New methods recently developed in our group, aimless shooting and likelihood maximization, are employed to construct a model for the reaction coordinate for the two system sizes studied. The reaction coordinate approximation is validated using the committor probability analysis. The transformation proceeds via a localized, elongated nucleus along the crystal edge formed by fluctuations in the supramolecular synthons, suggesting a nucleation and growth mechanism in the macroscopic system.
Baron Peters - One of the best experts on this subject based on the ideXlab platform.
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surface mediated nucleation in the solid state polymorph transformation of Terephthalic Acid
Journal of the American Chemical Society, 2007Co-Authors: Gregg T Beckham, Baron Peters, Cindy Starbuck, Narayan Variankaval, Bernhardt L TroutAbstract:A molecular mechanism for nucleation for the solid-state polymorph transformation of Terephthalic Acid is presented. New methods recently developed in our group, aimless shooting and likelihood maximization, are employed to construct a model for the reaction coordinate for the two system sizes studied. The reaction coordinate approximation is validated using the committor probability analysis. The transformation proceeds via a localized, elongated nucleus along the crystal edge formed by fluctuations in the supramolecular synthons, suggesting a nucleation and growth mechanism in the macroscopic system.
Kalyanjyoti Deori - One of the best experts on this subject based on the ideXlab platform.
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introducing nanocrystalline ceo2 as heterogeneous environmental friendly catalyst for the aerobic oxidation of para xylene to Terephthalic Acid in water
Journal of Materials Chemistry, 2013Co-Authors: Kalyanjyoti Deori, Satish Kumar Awasthi, Dinesh Gupta, Basudeb Saha, Sasanka DekaAbstract:CeO2 nanoparticles exposed in (100) and (111) surfaces have been synthesized and explored as a heterogeneous catalyst for the first time in the oxidation of para-xylene to Terephthalic Acid. The synthesis and catalysis reaction was environmental friendly, where water was used as the solvent. Ceria nanoparticles were synthesized with controlled size of 15 nm and high surface area of 268 m2 g−1 magnitude. These particles were exploited as a novel heterogeneous catalyst for aqueous phase oxidation of para-xylene to bypass all the hazardous steps involve in the manufacture of industrially important Terephthalic Acid. The result shows the formation of 30–40% Terephthalic Acid under mild reaction condition, i.e. at 70 °C in water, by avoiding the corrosive bromide promoter and acetic Acid solvent. The recyclability studies reveal that the recovered ceria catalyst retained its activity in para-xylene conversion without the change in the fluorite crystal structure, crystallite size and morphology of CeO2. At last, a radical mechanism for this particular catalytic activity of the catalysis reaction has been proposed based on the high surface area and the corresponding available exposed active (100) and (111) surfaces.
