Drop Dispersion in Suspension Polymerization

Leng, Douglas E.; Quarderer, George Joseph

doi:10.1080/00986448208911045

Cited by 50 publications

(21 citation statements)

References 15 publications

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“…Figure 3 shows plots obtained by photography of drop size measurement on normal probability coordinates. For locally isotropic turbulent flow, when drop sizes are in the inertial subrange, it has been shown (Shinnar, 1961;Leng and Quarderer, 1982) that the maximum stable drop size can be related to stirrer speed through the expression This was, without exception, the case at all positions and conditions investigated.…”

Section: Resultsmentioning

confidence: 85%

Scale‐up of liquid‐liquid dispersions in stirred tanks

1990

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A study of local drop size, drop size distribution and holdup fraction was conducted for liquid-liquid dispersions in three geometrically similar stirred tanks of standard configuration over a range of stirrer speeds and dispersed phase volume fractions. The tanks had diameter ratios 1:2:4, the smallest diameter being 11 an.. Two liquid-liquid systems were used: n-heptane-water and n-heptane containing different concentrations of di-(2-ethylhexyl) phosphoric acid dispersed in an aqueous sulphate solution. No significant local variations of the three parameters investigated were observed at constant stirrer speed and constant dispersed phase volume fraction. Measurements in the three tanks indicatrd that the rule of equal impeller tip speed provides the best scale-up criterion for equal interfacial areas per unit volume of dispersion. A correlation was also proposed for the Sauter mean diameter. ~ On a mene une Ctude sur la taille locale des gouttes, la distribution de taille des gouttes et la fraction de retenue pour des dispersions liquide-liquide dans trois rCservoirs agites geometriquement semblables et de configuration standard pour des vitesses d'agitateur et des fractions de volume de phase disperske varikes. Le rapport des diamktres des rCservoirs Ctaient de 1 :2:4, le plus petit dianietre Ctant de 1 1 cm. Deux systkmes liquide-liquide ont 6t6 utilisis: le ti-heptane-eau et le n-heptane contenant differentes concentrations d'acide di-(2-ethylhexyl) phosphorique dispersk dans tine solution de sulfate aqueuse. On n'a observe aucune variation locale des trois paramttres CtudiCs pour une vitesse de l'agitateur et une fraction de volume de phase dispersee constantes. Les mesures des trois rkservoirs indiquent que la rkgle de la vitesse Cgale de I'Cxtremit6 des turbines fournit le meilleur critkre de mise a I'Cchelle pour leu surfaces interfaciales par unite de volume de dispersion. On propose kgalement une correlation pour le diambtre moyen de Sauter.

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Section: Resultsmentioning

confidence: 85%

Scale‐up of liquid‐liquid dispersions in stirred tanks

1990

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“…Quite recently Das13 proposed a simpler relation based on the rheological model of Voigt: The influence of the μ c , on the other hand, has received relatively little attention. Several groups14–16 established experimental relations between d̄ and μ c , but these relations (Table I) were apparently not confirmed by other authors.…”

Section: Introductionmentioning

confidence: 80%

Continuous phase viscosity influence on maximum diameters of poly(styrene-divinylbenzene) beads prepared by suspension polymerization

Jegat¹,

Bois²,

Camps³

2000

J. Polym. Sci. B Polym. Phys.

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“…That may not be a serious problem with nonreacting dispersions but, in suspension polymerization, the physical prop- erties change with time so that the DSD can continue to change during the process [37]. Here, again, a drop will break if the deformation variable, sometimes described as a generalized Weber group [31], exceeds a critical value [39]. Drop breakage is then the result of viscous shear [26].…”

Section: Drop Breakage Mechanismsmentioning

confidence: 99%

“…Some key relationships are discussed by Yuan et al [5] and by Leng and Quarderer [39]. These concern parameters that control polymerization rate, product composition, and polymer molecular weight.…”

Section: Scaleup Limitations With Suspension Polymerizationmentioning

confidence: 99%

Free‐Radical Polymerization: Suspension

Brooks¹

2005

Handbook of Polymer Reaction Engineering

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Drop Dispersion in Suspension Polymerization

Cited by 50 publications

References 15 publications

Scale‐up of liquid‐liquid dispersions in stirred tanks

Scale‐up of liquid‐liquid dispersions in stirred tanks

Continuous phase viscosity influence on maximum diameters of poly(styrene-divinylbenzene) beads prepared by suspension polymerization

Free‐Radical Polymerization: Suspension

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