Process for making solid particles
AssigneeThe Procter & Gamble Company
InventorsGeoffrey Marc Wise, Ioannis Constantine Constantinides
Life of this patent
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Abstract
The invention relates to a process of creating particles of controlled size by creating them in the interstitial regions in a continuous liquid phase that contains a second, inert gas phase at high volume fraction; namely a foam. The second phase creates a physical barrier that limits the aggregation of formed particles beyond the size of the narrow interstitial regions occupied by the continuous phase. This technique is useful when the particles normally create large aggregates due to the fast nature of the reaction and the strong attractions between the formed particles, and for enhancing the deposition of high-value materials by connecting them to coacervates of controlled size.
Claims26
A method of making solid particles comprising:
- a) adding a precursor material to a liquid to form a liquid stream, wherein the concentration of precursor material is from about 2% to about 99% by weight of the liquid stream;
- b) adding an inert gas stream into the liquid stream of step a, resulting in a gas-liquid mixture having a gas volume fraction from about 30% to about 98% and an average Sauter mean bubble diameter of about 0.2 to about 200 μm;
- c) transforming the precursor material physically or chemically, resulting in the formation of solid particles.
Dependencies are inferred from the claim text.