Granted Patent B2

US 8,491,848 · App. 12/917,611 · Granted Jul 23, 2013

Abstract

Claims (31)

1. A reactor for producing particles in a precipitation process, comprising:

a housing defining a reaction chamber;

a stator assembly including two or more stators in the reaction chamber;

a rotor assembly including two or more rotors in the reaction chamber, the rotor assembly configured for rotation about an axis of rotation relative to the stator assembly;

a first inlet to supply a first reactant material to the reaction chamber at a first radial location;

a second inlet to supply a second reactant material to the reaction chamber at a second radial location different from the first radial location, wherein the first and second reactant materials react to produce precipitation of particles in the reaction chamber; and

an outlet to supply the particles formed in the reaction chamber, wherein the stator assembly includes at least a first stator and a second stator, wherein the rotor assembly includes at least a first rotor, a second rotor and a third rotor, wherein the first inlet is positioned to supply the first reactant material to the reaction chamber upstream of the first rotor, wherein the second inlet includes openings in the second stator configured to supply the second reactant material to the reaction chamber in a region of the second stator, wherein the second stator includes a plurality of circumferentially spaced teeth, and wherein the openings in the second stator are located radially inwardly of the teeth of the second stator and are in radial alignment with the teeth of the second stator.

2. A reactor as defined in claim 1 , wherein the stator assembly further includes a third stator and the rotor assembly further includes a fourth rotor, and wherein the third stator and the fourth rotor reduce the sizes of particles formed by reaction of the first and second reactant materials.

3. A reactor as defined in claim 1 , wherein one or more of the stators include a plurality of circumferentially spaced teeth in a circular pattern.

4. A reactor as defined in claim 1 , wherein one or more of the stators include a circular ring having a plurality of radial openings.

5. A reactor for producing particles in a precipitation process, comprising:

a housing enclosing a reaction chamber;

a stator assembly including at least a first stator and a second stator in the reaction chamber;

a rotor assembly including at least a first rotor, second rotor and a third rotor in the reaction chamber;

a first inlet to supply a first reactant material to the reaction chamber upstream of the first rotor;

a second inlet including openings in the second stator configured to supply a second reactant material to the reaction chamber in a region of the second stator; and

an outlet to provide particles formed by reaction of the first and second reactant materials, wherein the first reactant material is increased in speed by the first rotor and is reduced to small droplets by the first stator and the second rotor, wherein the first reactant material reacts with the second reactant material downstream of the second inlet, wherein the second stator includes a plurality of circumferentially spaced teeth, and wherein the openings in the second stator are located radially inwardly of the teeth of the second stator and are in radial alignment with the teeth of the second stator.

6. A reactor as defined in claim 5 , wherein the stator assembly further includes a third stator and the rotor assembly further includes a fourth rotor, wherein the third stator and the fourth rotor reduce the sizes of particles formed by reaction of the first and second reactant materials.

7. A reactor as defined in claim 5 , wherein one or more of the stators include a plurality of circumferentially spaced teeth in a circular pattern.

8. A reactor as defined in claim 5 , wherein one or more of the stators include a circular ring having a plurality of radial openings.

9. A reactor as defined in claim 5 , wherein the rotors and the stators are concentric with respect to an axis of rotation of the rotor assembly.

10. A reactor as defined in claim 5 , wherein the first inlet is located on an axis of rotation of the rotor assembly.

11. A reactor as defined in claim 5 , wherein the openings in the second stator comprise several openings in communication with the reaction chamber, the several openings equally spaced from an axis of rotation of the rotor assembly and equally spaced around the axis of rotation.

12. A reactor as defined in claim 5 , wherein particles are produced continuously by the precipitation process in the reaction chamber.

13. A reactor system for producing particles in a precipitation process, comprising:

a reactor including a housing enclosing a reaction chamber, a stator assembly including at least a first stator and a second stator in the reaction chamber, a rotor assembly including at least a first rotor, a second rotor and a third rotor in the reaction chamber, a first inlet coupled to the reaction chamber upstream of the first rotor, a second inlet coupled to the reaction chamber and including openings in the second stator, and an outlet of the reaction chamber;

a drive mechanism configured to rotate the rotor assembly relative to the stator assembly in the reaction chamber;

a first source configured to supply a first reactant material to the first inlet of the reactor; and

a second source configured to supply a second reactant material to the second inlet of the reactor, wherein the first reactant material is increased in speed by the first rotor and is reduced to small droplets by the first stator and the second rotor, wherein the first reactant material reacts with the second reactant material downstream of the second inlet to provide, at the outlet of the reaction chamber, particles formed by reaction of the first and second reactant materials, wherein the second stator includes a plurality of circumferentially spaced teeth, and wherein the openings in the second stator are located radially inwardly of the teeth of the second stator and are in radial alignment with the teeth of the second stator.

14. A reactor system as defined in claim 13 , wherein the first source includes a first process hold vessel coupled through a first pump to the first inlet of the reactor.

15. A reactor system as defined in claim 14 , wherein the second source includes a second process hold vessel coupled through a second pump to the second inlet of the reactor.

Assignments (8)