On a High Viscosity Polymer Finisher Apparatus With Two Agitator Axes Having Multidisks

Murakámi, Yasuhiro; Fujimoto, Katsumasa; Kakimoto, S; Sekino, Masaaki

doi:10.1252/jcej.5.257

Cited by 21 publications

(17 citation statements)

References 1 publication

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“…Meanwhile, the film on the impeller is thin (Figure 9). When the rotating speed increases, the renewal effect of mass transfer interface increases, 7,16,18 and k L a also increases (Figure 8).…”

Section: Methodsmentioning

confidence: 98%

“…The absorption of CO 2 in syrup solution was adopted to measure the volumetric mass transfer coefficient ( k L a ) of the twin-shaft kneader. − The experimental setup sketch is shown in Figure . Halves of the impellers are immersed in the highly viscous syrup solution.…”

Section: Methodsmentioning

confidence: 99%

“…Murakami et al investigated the mass transfer in a horizontal twin-shaft disk reactor by the gas absorption of pure CO 2 in glycerine. 16 The liquid-phase capacity coefficient was obtained by applying the surface renewal model of Danckwerts in a batch operation. Shimada et al measured the liquid-phase mass transfer coefficient by means of the absorption of CO 2 into the corn syrup and glycerine by using a rotating cylinder with surface renewal.…”

Section: Introductionmentioning

confidence: 99%

“…These problems mentioned above will be avoided if the probe is placed in the gas phase or the measurement focuses on the gas phase. Murakami et al investigated the mass transfer in a horizontal twin-shaft disk reactor by the gas absorption of pure CO 2 in glycerine . The liquid-phase capacity coefficient was obtained by applying the surface renewal model of Danckwerts in a batch operation.…”

Section: Introductionmentioning

confidence: 99%

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Film Formation and Mass Transfer Characteristics in a Horizontal Self-Cleaning Twin-Shaft Kneader with Highly Viscous Newtonian Fluids

Cheng

Wang

et al. 2021

Ind. Eng. Chem. Res.

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The visual experimental technique was used to investigate the film formation process in a horizontal self-cleaning twin-shaft kneader with highly viscous Newtonian fluids. The absorption of CO2 in syrup solution was adopted to study the mass transfer characteristics. There exist a radial unbounded film and bounded film on the disk element, while an axial unbounded film and bounded film are generated on the kneading bar. The minimum rotating speed for the axial unbounded film formation on the kneading bar is higher than that for the radial unbound film formation on the disk element. The twin-shaft kneader possesses much better mass transfer performance than the twin-shaft wheel reactor.

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Film Formation and Mass Transfer Characteristics in a Horizontal Self-Cleaning Twin-Shaft Kneader with Highly Viscous Newtonian Fluids

Cheng

Wang

et al. 2021

Ind. Eng. Chem. Res.

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“…Murakami et al [56] obtained correlations for hold-up and mixing time in RDCs. Fractional dead space (between 0 and 18% for their experimental data) can be predicted from the mixing time.…”

Section: Mass Transfer Issues In Polycondensations 75mentioning

confidence: 99%

Polycondensation

Costa¹,

Bachmann²

2005

Handbook of Polymer Reaction Engineering

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Direct use of mixing data for modeling high‐viscosity, melt‐phase, condensation polymer reactors

Neogi

Sampson

1995

J of Applied Polymer Sci

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SYNOPSISMathematical models for simultaneous reaction and mass transfer occurring in the manufacture of high-viscosity condensation polymers are considered. Particle tracking experiments are used to estimate convective flow rates and mixing volumes in a disc-ring reactor configuration. These results are incorporated directly into a mixing-cell model without resorting to the use of restrictive assumptions regarding the convective mixing. Both a penetration theory model and a flash evaporation model are used to simulate the transport a t the liquid-vapor interface. Although widely used in previous studies, the penetration theory model is ultimately rejected because it underpredicts the overall reactivity. Model results predict interactions between agitation rate, residence time, and the overall reaction rate for commercial-scale systems producing poly(ethy1ene terephthalate). The model is partially verified by comparison with degassing data. 0 1995 John Wiley & Sons, Inc. I NTRO D U CTlO NManufacture of condensation polymers in a meltphase process often requires continuous removal of the condensation product from the reaction mass to drive the reaction to high conversion. This occurs when the polycondensation reaction is reversible. At high conversion, the high viscosity of the melt decreases the rate of transport of the condensation product to the liquid surface and thereby reduces the overall reaction rate. A primary reactor design problem is to generate large amounts of surface area within the polymerization reactor in order to reduce the effective distance over which the condensation product must diffuse. A second problem is to ensure adequate mixing between the bulk of the reaction mass and the surface. This design challenge is currently met using a variety of equipment configurations. Examples of commercial polycondensation reactor designs include twin-screw and multiplescrew extruders, twin-shaft paddle mixers, horizontal disc-ring reactors, and the more traditional (and less capable) stirred tank with an anchor agitator.

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On a High Viscosity Polymer Finisher Apparatus With Two Agitator Axes Having Multidisks

Cited by 21 publications

References 1 publication

Film Formation and Mass Transfer Characteristics in a Horizontal Self-Cleaning Twin-Shaft Kneader with Highly Viscous Newtonian Fluids

Film Formation and Mass Transfer Characteristics in a Horizontal Self-Cleaning Twin-Shaft Kneader with Highly Viscous Newtonian Fluids

Polycondensation

Direct use of mixing data for modeling high‐viscosity, melt‐phase, condensation polymer reactors

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