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Batch Reaction

The Experts below are selected from a list of 5319 Experts worldwide ranked by ideXlab platform

D. Bonvin – 1st expert on this subject based on the ideXlab platform

  • Convergence analysis of iterative identification and optimization schemes
    Proceedings of the 2003 American Control Conference 2003., 2003
    Co-Authors: B. Srinivasan, D. Bonvin

    Abstract:

    The use of measurements to compensate for model uncertainty has received increasing attention in the context of process optimization. The idea consists of iteratively using the measurements for identifying model parameters and the updated model for optimization. This paper investigates the convergence of various iterative identification and optimization schemes in the presence of model mismatch. The optimization can be model-based, data-based or of mixed nature. Based on the advantages and drawbacks of the various approaches, a novel scheme is proposed, by which the optimization is model-based so as to ensure fast improvement and finishes as a data-based approach so as to converge towards the true optimum. The performance improvement obtained with the proposed methodology is illustrated via the simulation of a semi-Batch Reaction system.

  • Interplay between identification and optimization in run-to-run optimization schemes
    Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301), 2002
    Co-Authors: B. Srinivasan, D. Bonvin

    Abstract:

    The use of measurements to compensate for model uncertainty and disturbances has received increasing attention in the context of process optimization. The standard procedure consists of iteratively using the measurements for identifying the model parameters and the updated model for optimization. However, in the presence of model mismatch, this scheme suffers from lack of synergy between the identification and optimization problems. This paper investigates the performance of run-to-run optimization schemes and proposes to modify the objective function of the identification problem so as to include the cost function and the constraints of the optimization problem. The weights of the various terms in the extended objective function axe based on Lagrange multipliers. The performance improvement obtained with the proposed methodology is illustrated via the simulation of a semi-Batch Reaction system.

  • Optimization of a semi-Batch Reaction system under safety constraints
    1999 European Control Conference (ECC), 1999
    Co-Authors: O. Ubrich, B. Srinivasan, F. Stoessel, D. Bonvin

    Abstract:

    Maximizing the yield of a second-order Reaction by manipulating the inlet flow rate is considered in both the isoperibolic and isothermal modes. For safety considerations, constraints on (i) the amount of heat produced, and (ii) the temperature under cooling failure are imposed. The optimal solution is discontinuous and is first obtained numerically. Analytical expressions for (i) the evolution of the input between the discontinuities, and (ii) the switching times are obtained. Using the analytical characterization of the optimal solution, an efficient feedback implementation strategy is designed.

Junting Xu – 2nd expert on this subject based on the ideXlab platform

  • ethylene 1 hexene copolymerization with mgcl2 supported ziegler natta catalysts containing aryloxy ligands part i catalysts prepared by immobilizing ticl3 oar onto mgcl2 in Batch Reaction
    Journal of Molecular Catalysis A-chemical, 2012
    Co-Authors: Zhisheng Fu, Biao Huang, Junting Xu

    Abstract:

    Abstract Novel aryloxy-containing MgCl2-supported Ziegler–Natta catalysts were prepared by treating TiCl3(OAr) (Ar = C6H5-, 2,6-Me2C6H3-, 2,6-i-Pr2C6H3-, 2,6-t-Bu2C6H3-) with MgCl2 in Batch Reaction. The influences of aryloxy group on the titanium content and aryloxy/Ti molar ratio in the catalysts was investigated. Because of ligand exchanges between the immobilized titanium species and TiCl3(OAr) in the solution, the aryloxy/Ti molar ratio in these catalysts were less than 1. Using triethylaluminum (TEA) or triisobutylaluminum (TIBA) as cocatalyst, these catalysts showed different catalytic behaviors in ethylene-1-hexene copolymerization. Using TIBA as cocatalyst, the aryloxy-containing catalysts showed higher activity than a TiCl4/MgCl2 blank catalyst. Although the total 1-hexene incorporation of the copolymers prepared by the novel catalysts were lower than that of the blank system, the difference in 1-hexene content between the boiling n-heptane soluble part and the insoluble part was markedly lower, and the blockiness of comonomer sequence distribution was evidently higher. The TIBA activated aryloxy-containing catalysts were found to produce poly(ethylene-co-1-hexene) with more uniform chemical composition distribution.

  • Ethylene/1-hexene copolymerization with MgCl2-supported Ziegler–Natta catalysts containing aryloxy ligands. Part I: Catalysts prepared by immobilizing TiCl3(OAr) onto MgCl2 in Batch Reaction
    Journal of Molecular Catalysis A-chemical, 2012
    Co-Authors: Zhisheng Fu, Biao Huang, Junting Xu

    Abstract:

    Abstract Novel aryloxy-containing MgCl2-supported Ziegler–Natta catalysts were prepared by treating TiCl3(OAr) (Ar = C6H5-, 2,6-Me2C6H3-, 2,6-i-Pr2C6H3-, 2,6-t-Bu2C6H3-) with MgCl2 in Batch Reaction. The influences of aryloxy group on the titanium content and aryloxy/Ti molar ratio in the catalysts was investigated. Because of ligand exchanges between the immobilized titanium species and TiCl3(OAr) in the solution, the aryloxy/Ti molar ratio in these catalysts were less than 1. Using triethylaluminum (TEA) or triisobutylaluminum (TIBA) as cocatalyst, these catalysts showed different catalytic behaviors in ethylene-1-hexene copolymerization. Using TIBA as cocatalyst, the aryloxy-containing catalysts showed higher activity than a TiCl4/MgCl2 blank catalyst. Although the total 1-hexene incorporation of the copolymers prepared by the novel catalysts were lower than that of the blank system, the difference in 1-hexene content between the boiling n-heptane soluble part and the insoluble part was markedly lower, and the blockiness of comonomer sequence distribution was evidently higher. The TIBA activated aryloxy-containing catalysts were found to produce poly(ethylene-co-1-hexene) with more uniform chemical composition distribution.

Zhisheng Fu – 3rd expert on this subject based on the ideXlab platform

  • Ethylene/1-hexene copolymerization with supported ziegler-natta catalysts prepared by immobilizing TiCl3(OAr) onto MgCl2
    Journal of Applied Polymer Science, 2015
    Co-Authors: Hongrui Yang, Biao Huang, Zhisheng Fu, Zhiqiang Fan

    Abstract:

    ABSTRACT: Five titanium complexes TiCl3(OAr) (Ar5C6H5A, 2,6-Me2C6H3A, 2,6-i-Pr2C6H3A, 2,6-t-Bu2C6H3A, 4-Me-2,6-t- Bu2C6H3A) were immobilized, respectively, on MgCl2 in semiBatch Reaction to form supported catalysts for olefin polymerization. Comparing with the catalysts prepared by immobilizing TiCl3(OAr) onto MgCl2 in Batch Reaction, the catalysts prepared by semi- Batch Reaction have lower titanium content and higher ArO/Ti ratio. The aryloxy-containing catalysts studied in this work showed higher ethylene/1-hexene copolymerization activity and higher 1-hexene incorporation rate than the blank catalyst when activated by triisobutylaluminum. Similar effects of the aryloxy ligand were observed when the copolymerization is conducted in the presence of hydrogen. Introducing aryloxy ligand in the catalysts either by semiBatch or Batch Reaction caused similar effects of enhancing copoly- merization activity and a-olefin incorporation rate. Mechanism of the effects of aryloxy ligand has been discussed. V C 2014 Wiley Period- icals, Inc. J. Appl. Polym. Sci. 2015, 132, 41329. KEYWORDS:

  • ethylene 1 hexene copolymerization with mgcl2 supported ziegler natta catalysts containing aryloxy ligands part i catalysts prepared by immobilizing ticl3 oar onto mgcl2 in Batch Reaction
    Journal of Molecular Catalysis A-chemical, 2012
    Co-Authors: Zhisheng Fu, Biao Huang, Junting Xu

    Abstract:

    Abstract Novel aryloxy-containing MgCl2-supported Ziegler–Natta catalysts were prepared by treating TiCl3(OAr) (Ar = C6H5-, 2,6-Me2C6H3-, 2,6-i-Pr2C6H3-, 2,6-t-Bu2C6H3-) with MgCl2 in Batch Reaction. The influences of aryloxy group on the titanium content and aryloxy/Ti molar ratio in the catalysts was investigated. Because of ligand exchanges between the immobilized titanium species and TiCl3(OAr) in the solution, the aryloxy/Ti molar ratio in these catalysts were less than 1. Using triethylaluminum (TEA) or triisobutylaluminum (TIBA) as cocatalyst, these catalysts showed different catalytic behaviors in ethylene-1-hexene copolymerization. Using TIBA as cocatalyst, the aryloxy-containing catalysts showed higher activity than a TiCl4/MgCl2 blank catalyst. Although the total 1-hexene incorporation of the copolymers prepared by the novel catalysts were lower than that of the blank system, the difference in 1-hexene content between the boiling n-heptane soluble part and the insoluble part was markedly lower, and the blockiness of comonomer sequence distribution was evidently higher. The TIBA activated aryloxy-containing catalysts were found to produce poly(ethylene-co-1-hexene) with more uniform chemical composition distribution.

  • Ethylene/1-hexene copolymerization with MgCl2-supported Ziegler–Natta catalysts containing aryloxy ligands. Part I: Catalysts prepared by immobilizing TiCl3(OAr) onto MgCl2 in Batch Reaction
    Journal of Molecular Catalysis A-chemical, 2012
    Co-Authors: Zhisheng Fu, Biao Huang, Junting Xu

    Abstract:

    Abstract Novel aryloxy-containing MgCl2-supported Ziegler–Natta catalysts were prepared by treating TiCl3(OAr) (Ar = C6H5-, 2,6-Me2C6H3-, 2,6-i-Pr2C6H3-, 2,6-t-Bu2C6H3-) with MgCl2 in Batch Reaction. The influences of aryloxy group on the titanium content and aryloxy/Ti molar ratio in the catalysts was investigated. Because of ligand exchanges between the immobilized titanium species and TiCl3(OAr) in the solution, the aryloxy/Ti molar ratio in these catalysts were less than 1. Using triethylaluminum (TEA) or triisobutylaluminum (TIBA) as cocatalyst, these catalysts showed different catalytic behaviors in ethylene-1-hexene copolymerization. Using TIBA as cocatalyst, the aryloxy-containing catalysts showed higher activity than a TiCl4/MgCl2 blank catalyst. Although the total 1-hexene incorporation of the copolymers prepared by the novel catalysts were lower than that of the blank system, the difference in 1-hexene content between the boiling n-heptane soluble part and the insoluble part was markedly lower, and the blockiness of comonomer sequence distribution was evidently higher. The TIBA activated aryloxy-containing catalysts were found to produce poly(ethylene-co-1-hexene) with more uniform chemical composition distribution.