Simulation of emulsion copolymerization reactions in a continuous pulsed sieve-plate column reactor

Sayer, Cláudia; Giudici, Reinaldo

doi:10.1590/s0104-66322004000300010

Cited by 7 publications

(8 citation statements)

References 17 publications

(9 reference statements)

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“…• Monomer concentrations in polymer particles, monomer droplets, and aqueous phase are at thermodynamic equilibrium and are computed using the iterative procedure proposed by Omi et al 20 (1985). Details of the kinetic model can be found in Sayer and Giudici 19 and, for the sake of conciseness, will not be repeated in detail here.…”

Section: Methodsmentioning

confidence: 99%

Development of a Continuous Emulsion Copolymerization Process in a Tubular Reactor

Carvalho¹,

Chicoma²,

Sayer³

et al. 2010

Ind. Eng. Chem. Res.

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This contribution describes the development of a continuous emulsion copolymerization processs for vinyl acetate and n-butyl acrylate in a tubular reactor. Special features of this reactor include the use of oscillatory (pulsed) flow and internals (sieve plates) to prevent polymer fouling and promote good radial mixing, along with a controlled amount of axial mixing. The copolymer system studied (vinyl acetate and butyl acrylate) is strongly prone to composition drift due to very different reactivity ratios. An axially dispersed plug flow model, based on classical free radical copolymerization kinetics, was developed for this process and used successfully to optimize the lateral feeding profile to reduce compositional drift. An energy balance was included in the model equations to predict the effect of temperature variations on the process. The model predictions were validated with experimental data for monomer conversion, copolymer composition, average particle size, and temperature measured along the reactor length.

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Section: Methodsmentioning

confidence: 99%

Development of a Continuous Emulsion Copolymerization Process in a Tubular Reactor

Carvalho¹,

Chicoma²,

Sayer³

et al. 2010

Ind. Eng. Chem. Res.

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“…During the development of the mathematical model of Sty/BA emulsion copolymerization, we made several simplifying assumptions that are generally accepted and validated by the open literature. 16 These can be summarized as follows:…”

Section: Theory and Model Developmentmentioning

confidence: 99%

Process Model for Styrene and n-Butyl Acrylate Emulsion Copolymerization in Smart-Scale Tubular Reactor

Pokorný

Zubov

Matuška

et al. 2016

Ind. Eng. Chem. Res.

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Real-time optimization-based control methodologies in emulsion (co)polymerization allow achievement of a significant intensification of the process and increase of the product quality. This paper describes the development of the fast and computationally simple process model of continuous styrene and n-butyl acrylate emulsion copolymerization for use in nonlinear model predictive control (NMPC) of a smart-scale tubular reactor. The model predictions agree well with experimental data for monomer conversion, copolymer composition, temperature profile, average particle size, and number-average molecular weight. To account for the slower reaction rate at the beginning of the reaction, the model incorporates a thermodynamic description of comonomer partitioning between particle, water, and droplet phases based on Morton equations. For the purpose of the process model, a simple empirical function representing the solution of Morton partitioning was implemented. The number concentration of particles was estimated from measured monomer conversion profiles, as the predictions by first-principle nucleation models generally provide values substantially different from experiments. After the model incorporation into a framework for online state estimation and control, it will be used for open- and closed-loop control of the smart-scale tubular reactor.

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“…Bubbling behavior of gas–liquid two‐phase flow widely exists in chemical, biological, environmental industries, etc . Especially for various multiphase reactor applications, such as gas–liquid bubble column reactor, gas–liquid–solid fluidized reactor, and sieve‐plate column reactor, the initial detachment state of the bubbles is critical to the shape, size, oscillation, interaction, dissolution of bubbles during the subsequent migration. The floating bubbles make significant convection and mixing inside the reactor, which influences the gas–liquid contact time and contact area, thus affects the heat and mass transfer process between gas and liquid phases.…”

Section: Introductionmentioning

confidence: 99%

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

Shi

Jiang

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Bubble dynamics plays an important role in performance enhancement of multiphase reactor. The formation of the bubbles at the orifice is critical for the dynamics of bubbles and the mass transfer process during the rising stage. However, few studies have focused on the detailed changing characteristic of bubble formation and its relationship with mass transfer.RESULTS: The evolution of the bubble dynamics from millimeter to micrometer-sized immersed orifice plates is in situ visualized. Bubble inrush is observed from the orifices with diameters below 421 ∼m, resulting in significant fluctuation on the gas-liquid interface. The base of the leading bubble varies with the orifice diameter. Smaller orifice is preferred to produce more trailing bubbles with smaller size. The inrush time of the trailing bubble is prolonged with decreasing orifice diameter and increasing gas velocity. The inrush time and diameter of the latter trailing bubble are higher than the former at a certain gas velocity. The volumetric mass transfer coefficient (K L a) is obtained by measuring the bubble volume during the rising process using chemical absorption of carbon dioxide (CO 2 ) with sodium hydroxide (NaOH). Increasing gas velocity, decreasing orifice diameter and bubble inrush make an apparent positive impact on the K L a.CONCLUSIONS: The bubble inrush happens at micrometer orifice. Decreasing orifice diameter and increasing gas velocity are important to intensify oscillation of the leading bubble and increase the frequency of bubbles with high specific interfacial area, which are conducive to the enhancement of the volumetric mass transfer coefficient.

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Simulation of emulsion copolymerization reactions in a continuous pulsed sieve-plate column reactor

Cited by 7 publications

References 17 publications

Development of a Continuous Emulsion Copolymerization Process in a Tubular Reactor

Development of a Continuous Emulsion Copolymerization Process in a Tubular Reactor

Process Model for Styrene and n-Butyl Acrylate Emulsion Copolymerization in Smart-Scale Tubular Reactor

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

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