Assessment of Mixing Performance and Power Consumption of a Novel Polymerization Reactor System

Schaffer, Mark A.; Marchildon, E. Keith; McAuley, Kimberley B.; Cunningham, Michael F.

doi:10.1002/1521-4125(200104)24:4<401::aid-ceat401>3.0.co;2-w

Cited by 10 publications

(10 citation statements)

References 9 publications

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“…Maruko and Kusumoto (1992) have presented a dual shaft lattice-type horizontal agitator in a polymerization reactor to handle fluid viscosities of 5 kPa s. Tanguy et al (1999) employed a planetary mixer where multiple kneading paddles are mounted on carousel to process polyurethane composites. Schaffer et al (2001) designed a reactor with two co-rotating helical impellers built from two intersecting cylinders mounted on dual shaft in a tank that was used for melt-phase polymerization. Khopkar et al (2007) and Barar Pour et al (2007) studied the mixing performance of a dual shaft mixers based on a twisted anchor and an off-centered rotor-stator turbine.…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Rivera

Heniche

Takenaka

et al. 2009

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Rivera

Heniche

Takenaka

et al. 2009

Chemical Engineering Science

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“…The reactor itself is based on the design of high-viscosity fi nisher reactors described in several patents (Pinney, 1973;Iwasyk, 1978;Kendall et al, 1982;Livingston, 1983). Detailed information about the reactor system and operating procedures (including agitation, gas sparging, temperature control, and sample removal) has been presented by Schaffer et al (2001), Zheng (2004) and Zheng et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Melt‐Phase Nylon 612 Polycondensation Kinetics: Effects of Sodium Hypophosphite Catalyst

et al. 2007

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You et al., 1994). This study examines the catalytic effect of sodium hypophosphite (SHP). SHP is added to polyamides because, in addition to its catalytic properties, SHP acts as a whitening agent (Lysek and Ables, 2001), as well as a thermal stabilizer and antioxidant (Agouri and Muller, 1968;Kelmchuk, 1972;Kazuhiko et al., 1995), which gives desirable end-use properties to nylon fi bres and moulded products.SHP catalyzes a variety of esterifi cation and amidation reactions. For example, Fourier Transform Infrared (FTIR) and HighPerformance Liquid Chromatography (HPLC) studies have confi rmed that: SHP catalyzes the formation of anhydrides and water from polycarboxylic acids (Yang et al., 1996;Schramm and Rinderer, 2004), an important intermediate step in the formation of ester linkages between polycarboxylic acids and cellulose; SHP catalyzes esterifi cation reactions between anhydrides and hydroxyl Effects of sodium hypophosphite (SHP) catalyst and water on nylon 612 melt-phase polycondensation reactions were investigated using dynamic experiments with different catalyst levels (33, 113 and 249 ppm). The water concentration in the nylon melt was varied by altering the composition of a steam/nitrogen mixture bubbled through the molten polymer. Carboxyl and amine end-group concentrations were determined for polymer samples collected during the experiments. A model was developed to describe the kinetics of nylon polycondensation using the SHP catalyst in the high-temperature and low water operating region that corresponds to the fi nal stages of industrial melt-phase polyamidation processes.On a étudié les effets d'un catalyseur d'hypophosphite de sodium (SHP) et d'eau sur les réactions de polycondensation en phase fondue du nylon 612 par des expériences dynamiques avec différents niveaux de catalyseur (33, 113 et 249 ppm). On a fait varier la concentration d'eau dans le nylon fondu en modifi ant la composition d'un mélange vapeur/azote que l'on a fait buller dans le polymère fondu. La concentration des terminaisons carboxyle et amine a été déterminée pour des échantillons de polymères collectés lors des expériences. On a mis au point un modèle pour décrire la cinétique de la polycondensation de nylon avec le catalyseur SHP dans la région de fonctionnement à haute température et à faible concentration d'eau qui correspond aux stades fi naux des procédés industriels de polyamidation de la phase fondue.

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“…Several examples of these complex mixing operations can be found in the literature (Dreveton et al, 1994, Sanchez et al, 1998Schaffer et al, 2001;Furling et al, 2001;Chavez-Montes et al, 2003). A good performance of such operations implies a change in the impeller geometry during processing, i.e., remote clearance impellers in the first steps and close clearance impellers when a non-Newtonian highly viscous fluid is formed, although this option is not very easy to handle in practice.…”

Section: Introductionmentioning

confidence: 99%

Mixing rheometry for studying the manufacture of lubricating greases

Franco

Delgado

Valencia

et al. 2005

Chemical Engineering Science

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Assessment of Mixing Performance and Power Consumption of a Novel Polymerization Reactor System

Cited by 10 publications

References 9 publications

Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Melt‐Phase Nylon 612 Polycondensation Kinetics: Effects of Sodium Hypophosphite Catalyst

Mixing rheometry for studying the manufacture of lubricating greases

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