On the preparation of acrylic acid/vinyl acetate copolymers with constant composition: 4. Modelling batch and continuous free-radical AA/VA copolymerization

Zaldívar, Carmen; Iglesias, Gerardo; Sol, Octavio del; Pinto, J. C.

doi:10.1016/s0032-3861(97)00124-9

Cited by 16 publications

(12 citation statements)

References 7 publications

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“…As reported by Zaldívar et al., the evolution of the molecular weight distributions can be described by the moments technique. The use of the moments approach leads to formulation of a finite and small number of balance equations, instead of the large number of balance equations that are needed to represent the full molecular weight distributions of the individual species present in the copolymerization medium.…”

Section: Model Developmentmentioning

confidence: 97%

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: I—Characterization of Residence Time Distributions

Oechsler

Poblete

Melo

et al. 2018

Macro Reaction Engineering

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The residence time distributions (RTDs) of continuous solution copolymerization tank reactors connected in series are evaluated experimentally to analyze features related to the fluid dynamics of this class of reactors. For this purpose, tracer step experiments are carried out in lab‐scale polymerization tank reactors to provide experimental data for analysis of the quality of mixing and evaluate associated macromixing effects. Besides, mathematical models are developed to describe the RTD data obtained experimentally. Based on a compartmental approach, perfect mixing tanks, tanks with stagnant zones, tanks with crossflow, and tanks in series with backflow models were proposed. Particularly, the analysis of the available experimental data and of mathematical models indicate that the flow features of these systems are strongly associated with the established degree of mixing, presenting significant non‐ideal flow behavior, usually neglected in most modeling and experimental studies.

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Section: Model Developmentmentioning

confidence: 97%

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: I—Characterization of Residence Time Distributions

Oechsler

Poblete

Melo

et al. 2018

Macro Reaction Engineering

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“…Zaldivar et al 7 reported experimental measure- L/mol ⅐ s in ethyl acetate (k p /k t 1/2 ϭ 0.07) using a rotating sector measurement at 60°C. Although these data seem to be extremely low compared to more accurate measurements of k p using pulsed laser polymerization techniques (e.g., Hutchinson et al 14 found k p ϭ 9500 L/mol/s at 60°C), the tendancy seems to agree with the data reported below.…”

Section: Introductionmentioning

confidence: 99%

Effect of solvent on the rate constants in solution polymerization. Part II. Vinyl acetate

McKenna

Villanueva

1999

J. Polym. Sci. A Polym. Chem.

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“…The kinetic model was presented in detail in Part I of this work . The statistical moments of molar masses distribution for living and dormant polymer chains are defined as shown by Zaldívar et al:

γ_{k, m} = \sum_{i = 0}^{\infty} \sum_{j = 0}^{\infty} i^{k} j^{m} R_{i, j}^{1}

π_{k, m} = \sum_{i = 0}^{\infty} \sum_{j = 0}^{\infty} i^{k} j^{m} R_{i, j}^{2}

λ_{k, m} = \sum_{i = 0}^{\infty} \sum_{j = 0}^{\infty} i^{k} j^{m} P_{i, j}

…”

Section: Model Developmentmentioning

confidence: 99%

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: II—Investigation of Micromixing Effects

Oechsler

Poblete

Melo

et al. 2019

Macro Reaction Engineering

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/mren.201900018. Parameter Unit Reference ΔH p = 70.0 kJ gmol −1 [45] Cp s = 154.040 − 142.29T + 0.80539T 2 J [kmol K] −1 [46] 113.349 290.2 0.6051 0.0013567 1 2 3 Cp T T T m = + − − J [kmol K] −1 [46] Cp p = 0.2595 + 1.024 × 10 −3 (T − 273.15) cal [g K] −1 [47] UA R1 = UA R2 = 22.35 J [K h] −1 Estimated αUA R1 = αUA R2 = 948 J [K h] −1 Estimated ε R1 = ε R2 = 0.55 Dimensionless Estimated ρ c = 873 g mL −1 Provider Cp c = 2.478 J [g K] −1 Provider τ c = 18 s Measured V cR1 = 490 mL Measured V cR2 = 590 mL Measured

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On the preparation of acrylic acid/vinyl acetate copolymers with constant composition: 4. Modelling batch and continuous free-radical AA/VA copolymerization

Cited by 16 publications

References 7 publications

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: I—Characterization of Residence Time Distributions

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: I—Characterization of Residence Time Distributions

Effect of solvent on the rate constants in solution polymerization. Part II. Vinyl acetate

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: II—Investigation of Micromixing Effects

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