Method for producing fine particles and apparatus for producing fine particles

摘要

A method for producing fine particles, including: discharging a fine particle material liquid, where solid materials to be formed into fine particles are dissolved or dispersed in a solvent or are melted, from two or more discharge holes in a downward vertical direction, to thereby form liquid droplets; and solidifying the liquid droplets discharged to form fine particles, wherein in the discharging a fine particle material liquid, gas flow is supplied at angle of greater than 0° but 90° or smaller to the downward vertical direction, and wherein an initial discharge velocity of the liquid droplets discharged from the discharge hole located at an upstream side of the gas flow in a flowing direction thereof is equal to or higher than an initial discharge velocity of the liquid droplets discharged from the discharge hole located at a downstream side of the gas flow in the flowing direction thereof.

主权项

1. A method for producing fine particles, comprising:
discharging a fine particle material liquid, where solid materials to be formed into fine particles are dissolved or dispersed in a solvent or are melted, from two or more discharge holes in a downward vertical direction, to thereby form liquid droplets; and solidifying the liquid droplets discharged to form fine particles, wherein in the discharging the fine particle material liquid, a gas flow is supplied at an angle of greater than 0° but 90° or smaller with respect to the downward vertical direction, and wherein an initial discharge velocity of the liquid droplets discharged from the discharge hole located at an upstream side of the gas flow in a flowing direction thereof is equal to or higher than an initial discharge velocity of the liquid droplets discharged from the discharge hole located at a downstream side of the gas flow in the flowing direction thereof; wherein in at least one of adjacent pairs of the discharge holes in the two or more discharge holes, the liquid droplets discharged from the discharge hole located at the downstream side of the gas flow in the flowing direction thereof have an initial discharge velocity V1 and the liquid droplets discharged from the discharge hole located at the upstream side of the gas flow in the flowing direction thereof have an initial discharge velocity V2, where the initial discharge velocity V1 is equal to or smaller than 0.9×V2.