Molecular Weight Distribution Control in a Batch Polymerization Reactor Using the On-Line Two-Step Method

Yoo, Kee-Youn; Jeong, Boong-Goon; Rhee, Hyun‐Ku

doi:10.1021/ie980799b

Cited by 18 publications

(9 citation statements)

References 14 publications

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“…As mudanças nas constantes de terminação (k T ) e propagação (k P ), devidas às limitações impostas pelo aumento da viscosidade do meio reacional, geralmente são expressas como funções da temperatura e da composição do meio, embora possam também ser representadas como funções da viscosidade do meio [59,60] ou por outras formas empíricas [17,61,62] . Correlações baseadas na teoria do volume livre são também bastante utilizadas, pois o volume livre pode caracterizar extremamente bem as resistências à difusão em meios complexos [54,63] .…”

Section: Correlações Para Os Efeitos Gel E Vítreounclassified

Uma revisão sobre os processos de polimerização em suspensão

2007

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Resumo: Inúmeros processos podem ser utilizados para produção de materiais poliméricos. Cada processo apresenta características peculiares, que permitem produzir resinas com as mais variadas propriedades, visando a diferentes aplicações do material polimérico final. Os processos de polimerização em suspensão são bastante empregados para produção de resinas poliméricas por apresentarem muitas vantagens, como a facilidade de separação, fácil remoção de calor e controle de temperatura e, principalmente, pelos baixos níveis de impureza e de aditivação no produto final. Por isso, processos de polimerização em suspensão são apropriados para obtenção de produtos para aplicações biotecnológicas e médicas, dentre outras. O objetivo principal deste trabalho é apresentar uma discussão dos aspectos fundamentais inerentes aos processos de polimerização em suspensão, visando a uma compreensão do efeito das principais variáveis de processo sobre o desempenho de polimerizações em suspensão. Mostra-se também que a espectroscopia do infravermelho próximo (NIRS) pode ser muito útil para permitir o monitoramento e o controle em tempo real de processos de polimerização em suspensão, para a obtenção de materiais poliméricos com características especiais. Palavras-chave: Polimerização, suspensão, espectroscopia, infravermelho próximo. A Review on Suspension Polymerization ProcessesAbstract: Several processes can be employed for manufacturing polymer materials. Each process presents some intrinsic features that lead to production of resins with peculiar properties, which define the end-use application of the final polymeric material. Suspension polymerization processes are extensively used because of their many advantages, such as the easy separation of the polymer particles, easy removal of the heat of reaction, easy temperature control and low levels of impurities and additives in the final polymer material. For this reason, suspension polymerization processes are suitable to produce polymer resins for biotechnological and medical applications. The main objective of this work is to discuss the fundamental aspects of suspension polymerization processes, focusing upon the effects of the main process variables on the performance of suspension polymerizations. Additionally, it is shown that near infrared spectroscopy (NIRS) can be useful for monitoring and real time control of suspension processes, allowing for production of polymer beads with controlled morphology.

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Section: Correlações Para Os Efeitos Gel E Vítreounclassified

Uma revisão sobre os processos de polimerização em suspensão

2007

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“…Yet another approach that aimed at controlling a polymer property distribution was developed by Yoo et al563 They proposed an on‐line two‐step method to obtain a specific MWD. The validation was carried out by comparing the results obtained with their method to experimental data from an isothermal solution polymerization of STY.…”

Section: Other Topics Related To Sensorsmentioning

confidence: 99%

A Critical Overview of Sensors for Monitoring Polymerizations

Fonseca

Dubé

Penlidis

2009

Macro Reaction Engineering

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The available on‐line and in‐line sensor technologies developed for polymerization reactors from 1990 until today are discussed and critically reviewed. About 600 references are included, which evidence the growth in sensor technology in the last two decades. Sensors for operational parameters in polymer reactors (i.e. temperature, pressure, level and flow) as well as sensors for polymer property monitoring (i.e. calorimetry, chromatography and spectroscopy, among others) are included. Complementary topics such as state estimation, multivariate statistical methods, fault diagnosis techniques and optimal sensor selection and location are briefly covered.

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“…According to the proposed method, the experimentally measured MWD at the end of a batch was used to update the optimal monomer and initiator trajectories for the next batch, so that a desired MWD can be obtained. Yoo et al20 developed an on‐line two‐step method to obtain a desired MWD in a styrene solution free‐radical polymerization batch reactor. Sayer et al21 investigated the effect of different copolymer composition control policies on the MWD and polymer gel‐fraction in the emulsion copolymerization of methyl‐methacrylate/butyl acrylate.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Optimization of Molecular Weight Distribution Using Orthogonal Collocation on Finite Elements and Fixed Pivot Methods: An Experimental and Theoretical Investigation

Saliakas

Chatzidoukas

Krallis

et al. 2007

Macro Reaction Engineering

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In the present study, two numerical methods, namely the orthogonal collocation on finite elements and the fixed pivot technique, are employed to calculate the MWD in an MMA free‐radical batch suspension polymerization reactor operating up to very high conversions (e.g., ≥95%). The theoretical MWD predictions are directly compared with experimentally measured MWDs, obtained from a pilot‐scale batch MMA suspension polymerization reactor. It is shown that there is a very good agreement between model predictions and experimental measurements on both monomer conversion and MWD. Subsequently, two different time‐optimal temperature trajectories are calculated to obtain a polymer having either a narrow or a bimodal MWD in minimum batch time. The calculated time optimal trajectories are then applied, as set point temperature changes, to a pilot plant batch polymerization reactor. It is shown that the measured MWDs are in very good agreement with the off‐line calculated optimal MWDs.

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Molecular Weight Distribution Control in a Batch Polymerization Reactor Using the On-Line Two-Step Method

Cited by 18 publications

References 14 publications

Uma revisão sobre os processos de polimerização em suspensão

Uma revisão sobre os processos de polimerização em suspensão

A Critical Overview of Sensors for Monitoring Polymerizations

Dynamic Optimization of Molecular Weight Distribution Using Orthogonal Collocation on Finite Elements and Fixed Pivot Methods: An Experimental and Theoretical Investigation

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