Blending liquid/solid mixing

The mixing of solids, whether free flowing or cohesive, resembles to some extent the mixing of low-viscosity liquids. Both processes intermingle two or more separate components to form a more or less uniform product. Some of the equipment normally used for blending liquids may, on occasion, be used to mix solids. 

Yet there are significant differences between the two processes. Liquid blending depends on the creation of flow currents, which transport unraixed material to the mixing zone adjacent to the impeller. In heavy pastes or masses of particulate solids no such currents are possible, and mixing is accomplished by other means. In consequence, much more power is normally required in mixing pastes and dry solids than in blending liquids. 

In Fig. 11.3, we made a comparison between the binodals obtained from dynamic Monte Carlo simulations (data points) and from mean-field statistical thermodynamics (solid lines). First, one can see that even with zero mixing interactions B = 0, due to the contribution of Ep, the binodal curve is still located above the liquid-solid coexistence curve (dashed lines). This result implies that the phase separation of polymer blends occurs prior to the crystallization on cooUng. This is exactly the component-selective crystallizability-driven phase separation, as discussed above. Second, one can see that, far away from the liquid-solid coexistence curves (dashed lines), the simulated binodals (data points) are well consistent... 

This technology refers to the physical mixing (blending) of dry fertilizer materials without the deliberate introduction of chemical reactions or the enlargement of the material particle granule) size. The blending of solid and liquid fertilizer materials is also practiced in some instances to produce fluid multinutrient products. However, the production and marketing of fluid fertilizers are beyond the scope of this examination (refer to Chapter 10). 

In the previous section we discussed dispersive mixing in solid-liquid systems. Another important type of dispersive mixing is in liquid-liquid systems. This occurs when we mix incompatible or partially incompatible polymer melts. The production of polymer blends is very important in the polymer industry as a result, liquid-liquid dispersive mixing has received significant attention over the last two or more decades. 

With a high speed mixer, set the jacket temperature at 90°C. Charge the resin and dry stabilizer, mix at high speed to 60°C. Add the plasticizer and other liquids and mix to the dry point at 70-85°C. Add the other solids and drop at 90-105°C with monomeric plasticizers. For polsrmerics, drop at 100-115°C. This dry blend can be either stored or processed immediately. Processing of suspension resin formulation is performed by a variety of techniques such as extrusion, injection molding, and calendering to fuse the PVC and produce the end product. 

---