METHOD FOR PRODUCING PARTICLES

• Main Authors: YANAGI TAKUO, KAWAOKA HIROKAZU
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2017
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method for efficiently producing fine particles with low crystal growth of the raw material components, in particular fine particles with a plurality of raw material components in a highly complexed state and having low crystal growth, without blockage of the nozzle.SOLUTION: A method of the present invention for producing particles comprises: injecting a good solvent solution that includes a good solvent and a raw material component dissolved in the good solvent, with a nozzle into a precipitating poor solvent that has been heated to a temperature higher than the boiling point of the good solvent, to evaporate the good solvent solution and then precipitate a plurality of particles; and running a cleansing poor solvent through the nozzle before starting and after completing injection of the good solvent solution into the precipitating poor solvent.SELECTED DRAWING: Figure 1 【課題】本発明の目的は、原料成分の結晶成長が少ない微粒子、特に、複数の原料成分が高度に複合化されかつ結晶成長が少ない微粒子を、ノズルが閉塞することなく、効率よく製造する方法を提供することを目的とする。【解決手段】粒子を製造する本発明の方法は、良溶媒及び良溶媒に溶解している原料成分を含む良溶媒溶液を、良溶媒の沸点よりも高い温度に加熱されている析出用貧溶媒にノズルによって注入することにより、良溶媒溶液を蒸発させて複数の粒子を析出させること、及び良溶媒溶液を析出用貧溶媒に注入開始するとき、及び注入終了するときに、洗浄用貧溶媒をノズルに通すことを含む。【選択図】図１