Sonic method of enhancing chemical reactions to provide uniform, non-agglomerated particles
AssigneeArch Chemicals, Inc.
InventorsSaeed H. Mohseni, John J. Jardas
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Abstract
A method for making a suspension, dispersion or emulsion of non-agglomerated particles comprising forming particles in a liquid medium, wherein sonic energy is applied to the liquid medium at the point of contact of the reactants during the particle forming step to produce the suspension, dispersion or emulsion of non-agglomerated particles. The invention is also directed to a method for making a suspension of non-agglomerated pyrithione salt particles, comprising the steps of forming pyrithione salt particles in a liquid medium, wherein sonic energy is applied to the liquid medium during the forming step to produce the suspension of non-agglomerated pyrithione salt particles.
Claims54
An improved method for making a suspension, emulsion or dispersion of non-agglomerated solid or liquid particles, comprising the step of forming the particles by a chemical reaction of at least two reactants in a liquid medium in the presence of sonic energy, wherein the improvement comprises applying said sonic energy to the liquid medium at the point of contact of the reactants with each other, thereby causing intimate mixing of the reactants and an associated rapid completion of the reaction to produce a desired product while minimizing or reducing the risk of forming unwanted byproduct, said desired product being in the form of said suspension, emulsion or dispersion of non-agglomerated particles having an essentially uniform size and shape.
A continuous method of making a suspension, emulsion or dispersion of non-agglomerated solid or liquid particles on a commercial scale, said method comprising continuously forming the particles by a transchelation reaction of at least two reactants by contacting said reactants at a point of contact, and applying sonic energy at said point of contact in order to cause intimate mixing and facilitate rapid transchelation at said point of contact, thereby producing a desired product while minimizing or reducing unwanted byproduct production, said desired product being in the form of said suspension, emulsion or dispersion of non-agglomerated particles resulting from said transchelation.
A method for making a suspension of non-agglomerated pyrithione salt particles by forming pyrithione salt particles in a liquid medium by a transchelation reaction of at least two reactants, wherein sonic energy is applied to the liquid medium during the forming step at the point of contact of said reactants in order to produce the suspension of non-agglomerated pyrithione salt particles, wherein
- said particles are selected from the group consisting of magnesium pyrithione, barium pyrithione, bismuth pyrithione strontium pyrithione, copper pyrithione, zinc pyrithione, cadmium pyrithione, zirconium pyrithione, iron (II) pyrithione, tin pyrithione, nickel pyrithione, cobalt pyrithione, manganese pyrithione, and combinations thereof, and wherein said particles in said suspension of non-agglomerated particles have median sizes in the range of from about 0.01 micron to about 50 microns.
A method for making a suspension of non-agglomerated pyrithione salt particles, comprising the steps of:
- forming pyrithione salt particles in a liquid medium, wherein sonic energy is applied to said liquid medium during said forming step to produce said suspension of non-agglomerated pyrithione salt particles.
A method for making a suspension of non-agglomerated particles of pyrithione salts, comprising the step of:
- reacting pyrithione or a water-soluble salt of pyrithione and a water-soluble polyvalent metal salt in an aqueous medium and in the presence of a dispersing additive to produce particles of pyrithione salts, wherein sonic energy is applied to said aqueous medium during said reacting step to produce said suspension of non-agglomerated pyrithione salt particles, said non-agglomerated pyrithione salt particles having a median size of from about 0.1 to about 50 microns.
Dependencies are inferred from the claim text.