Spray dried dispersions advantages

A spray dried form of rice starch in which the individual starch granules are dried in aggregates has been developed by CNP. These porous starch spheres are advantageous with regard to their greatly improved dispersibility over other starches. The aggregates also have special properties associated with absorption of other solutes within the sphere structure and slow release for an improved distribution. 

Inverse emulsion polymerization is a term used for water in oil (monomer) dispersion polymerization as opposed to conventional emulsion polymerization where the monomer and polymer are largely insoluble and dispersed in water. The advantage is that high molecular weight polymers and copolymers of water-soluble monomers may be prepared without the attendant viscosity build mentioned earlier. The process chemistry is well established as indicated in the patent literature (230-233) but not widely used and likely to be less so as solvents are removed from processing. Spray drying is often used for polymer isolation (234). 

The most advantageous configuration of pulse combustion drying is to disperse a liquid material within a pulsating jet of flue gases (Fig. 2.20) which is then dried in a spray drying chamber (Stewart et al., 1991 Keller et al, 1992 Ozer, 1993 Ozer et cd., 1993 Zbicinski et al, 1998 Rehkopf, 2012). 

An aerosol is a colloidal dispersion of liquid droplets in a vapor. Aerosols can be used to make oxide powders in a variety of ways. For example, an aqueous sol can be sprayed into alcohol, where the aerosol droplets gel to produce spheres [110]. Subsequent firing produces perfect dense oxide spheres whose size depends on the concentration of the initial sol. Schwartz et al. [4] prepared powders of lead lanthanum zirconate titanate by spraying a salt solution into ammonium hydroxide and then spray-dried the resulting powder to produce uniform spheres 0.5-2/rm in diameter. In such complex compositions, aerosols are advantageous, because each droplet is a small reaction vessel, and heterogeneity cannot occur on a scale larger than the size of the droplet. 

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