Non-geometric scale

Scale-up is non-geometric with length/diameter ratios varying from 2 1 to 30 1. The non-geometric scale-up helps to increase heat transfer area as reactor volume increases. 

Pettelkau and Ehrig [36] also described an up-flow reactor for chloroprene emulsion polymerization. Their reactor is operated full with a bottom propeller-type agitator that is mounted at an angle to achieve good mixing without internal baffles. Non-geometric scale-up with large H/D ratios are used to increase heat transfer area in the jacket. 

Good mixing and heat transfer can be obtained without internal baffles if marine propellers are mounted at an angle off the vertical. Such a reactor system is described by Pettelkou and Ehrig (8). They have also suggested non-geometric scale-up to preserve heat transfer surface as reactor volume increases. This Bayer patent (8) claims considerable success in the polymerization of chloroprene which is a system quite prone to flocculation, wall polymer formation and excessive reaction rates. 

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