Device for producing particles and method for producing particles

1. A method of producing particles by bringing plural dissimilar materials into contact with each other, the method comprising:

feeding a liquid into a reactor from a first end portion of the reactor such that the liquid flows along an inner peripheral surface of the reactor and generating a vortex flow toward a second end portion in the reactor by the feeding of the liquid;

disposing a flow-assisting blade capable of rotating around a central axis line of the reactor and rotating the flow-assisting blade; and

injecting materials to be contacted into the reactor, discharging a contacted liquid from the second end portion of the reactor, and generating particles in the contacted liquid;

wherein the flow-assisting blade has a radius r and wherein the reactor has an inner radius R, and wherein a ratio r/R of the radius r of the flow-assisting blade to the inner radius R of the reactor is ¼ to ¾;

wherein an inlet for the liquid into the reactor has a cross-sectional area of A, and the liquid has an inflow rate Q into the reactor of 0.5 A to 10 A×60×10 3 ; and

wherein an average flow rate of the liquid at the inlet is Vv, and the flow-assisting blade is rotated at a speed that is ½ Vv or more.

2. The method of producing particles according to claim 1 , wherein all or part of the contacted liquid discharged from the second end portion of the reactor is fed into the reactor from the first end portion of the reactor such that the liquid flows along the inner peripheral surface of the reactor.

3. The method of producing particles according to claim 2 , wherein part of the contacted liquid is extracted from a circulation system that transfers the contacted liquid discharged from the second end portion of the reactor to the first end portion of the reactor, and the particles are recovered by solid-liquid separation.

4. The method of producing particles according to claim 1 , wherein the liquid is fed into the reactor from the first end portion at an inflow velocity of 0.5 m/sec or more.

5. The method of producing particles according to claim 1 , wherein the reactor has a ratio L/D of 2 or more of the longitudinal length L to the diameter D of an internal space of the reactor.

6. The method of producing particles according to claim 1 , wherein the flow-assisting blade has a disk shape intersecting with the central axis line of the reactor.

7. The method of producing particles according to claim 1 , wherein the flow-assisting blade has a disk shape having a concave-convex portion in a periphery thereof.

8. The method of producing particles according to claim 1 , wherein the flow-assisting blade has a disk-shaped body intersecting the central axis line of the reactor and a protrusion protruding to the second side at least in a periphery of the disk-shaped body and intersecting a circle having a center on the central axis line.

9. The method of producing particles according to claim 1 , wherein the flow-assisting blade is located closer to the first end portion of the reactor than where the liquid is fed in the first end portion of the reactor.

10. The method of producing particles according to claim 1 , wherein a position at which the materials to be contacted is injected, is disposed outboard from the flow-assisting blade in the direction of the radius around the central axis line in the reactor.