On a high viscosity polymer finisher apparatus with two agitator axes having multidisks
30 Sep 1972-Journal of Chemical Engineering of Japan (The Society of Chemical Engineers, Japan)-Vol. 5, Iss: 3, pp 257-263
TL;DR: In this paper, the characteristics of a mixing apparatus with two agitator axes having multidisks as a high viscosity polymer finisher were studied from a practical point of view.
Abstract: The characteristics of a mixing apparatus with two agitator axes having multidisks as a high viscosity polymer finisher was studied from a practical point of view, 1) Holdup : it could be correlated by using a term of (μnD/δ). 2) Power consumption and mixing time : the results were compared with those of other high-viscosity equipment. 3) Residence time distribution and dead space : the former almost agreed with the tanks-inseries model. The latter seemed to be small. 4) Surface renewal action : the rate of surface renewal was determined from the gas absorption and also estimated by the observation of liquid flow. As a model reaction polycondensation polymerization of polyamide in the presence of water and viscosity stabilizer is discussed.
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TL;DR: In this paper, a mathematical model of a continuous polycondensation reactor used in the finishing stages is developed, which predicts the directions in which mixing, and other process and operational variables, will influence the progress of poly condensation.
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TL;DR: In this article, the most homogeneous and speedy mixing was obtained by the use of either of the commonly employed mixers, a ribbon mixer or a screw mixer having a draft tube.
Abstract: (1) Time required for carrying outcomplete mixing was observed of high viscous liquidis various types of mixing impellers. The most homogeneous and speedy mixing was obtained by the use of either of the commonly employed mixers, a ribbon mixer or a screw mixer having a draft tube.(2) In such case, time required for carrying out complete mixing was inversely proportional to the impeller speed, and independent both of liquid viscosity and vessel diameter. In general, complete mixing was mostly attained in three circulations of the liquid.In order to operate various sizes of vessels at the same mixing velocity, geometrically similar impellers should be used and rotated at the equal speed.(3) Number of revolution of a mixing impeller required for carrying out complete mixing and that required for one circulation of liquid remained constant, independent of the impeller speed.(4) Mixing energy was proportional to the liquid viscosity and increased proportionally with the mixing speed.(5) Simplified explanations are given to these experimental results.
22 citations