Impeller weight, table

Butyl methacrylate, lauryl methacrylate, and cetyl methacrylate were combined with maleic anhydride, lauryl mercaptan, and process oil and then charged into a 2-liter reaction vessel equipped with two mixing impellers rotated at 300 rpm during the reaction. The mixture was preheated to 85°C and then treated with 2,2 -azoisobutyronitrile and heated for 4 hours at 85°C followed by 1 hour at 100°C. In some cases additional oil was added to make the product more easily pourable. Unreacted maleic anhydride and other low-molecular-weight products were removed by heating the reaction mass to 120°C while applying a vacuum. Reaction scoping results are provided in Table 1. 

Table 7.1 The variation of coalescence pore size with water-soluble polymer concentration as a function of molecular weight. The phase volume is 85%, impeller speed of 300 rpm, and dosing and homogenization times of 600 s each, temperature of emulsification is 25° C...

The correction factor is presented in Table 7-8 as a function of weight concentration. This empirical coefficient was developed by Chemineer Inc., based on experimental work. It is often difficult to predict the nature of the flow or the drag coefficient near an impeller blade. At weight concentrations in excess of 15%, the solids start to interact, hindering settling so that the settling velocity must be adjusted. 

---