METHOD OF OBTAINING NANO- AND MICROPARTICLES OF WATER SOLUBLE SUBSTANCES USING SUPERCRITICAL CARBON DIOXIDE Russian patent published in 2009 - IPC B01F3/00 B82B3/00 

FIELD: chemistry.

SUBSTANCE: present invention can be used in pharmaceutical, food, chemical and electronic industry when making catalysts, polymers, pesticides and coatings. An aqueous solution of micronised substance is poured from container 6 into a high pressure cell 5. Using a high pressure pump 2, carbon dioxide is fed from cylinder 1 into booster cylinder 4 and cell 5 until attaining pressure in the range of 90-400 atm. Temperature in booster cylinder 4 and cell 5 is kept in the range of 33 - 160°C. The obtained two-phase system (aqueous solution of substance/carbon dioxide) is dispersed through a spray nozzle 10 at 100-200°C temperature. Supercritical carbon dioxide acts as the "plunger". Nano- and micro-sized particles formed in the dispersion chamber are trapped in separator 8.

EFFECT: invention allows for obtaining aerosols and powders of water soluble substances of nano- and micro-sizes without using harmful organic solvents.

3 cl, 4 dwg, 6 ex