Patent ID: 8382877
Filing Date: 2013-02-26
Classification: B01D,B01J,B22F

Abstract:
1. A process of preparing inorganic metal oxide nanoparticles and metal nanoparticles using an apparatus, wherein the apparatus comprises: a stirrer, a measuring pump, a reactor, a micro-membrane tube unit, a container, and an ultrasonic generator; wherein the micro-membrane tube unit is installed in the reactor, the reactor is coupled to the ultrasonic generator at a controlled temperature and frequency, the micro-membrane tube unit is connected via an inlet with the measuring pump that is linked to the container; wherein the process comprises: dissolving a desired metal precursor in distilled water to form a solution of the desired metal precursor; transferring the solution of the desired metal precursor into the reactor; transferring a solution of reductant or precipitator into the container; injecting the solution of reductant or precipitator into lumens of the micro-membrane tube unit via the measuring pump at a desired flow rate, temperature, stirring speed and a desired supersonic frequency, and then diffusing the solution of reductant or precipitator into inside of the reactor via micro-holes distributed on walls of the micro-membrane tube unit; either (a) producing inorganic metal oxide nanoparticles by carrying out a precipitation reaction for 2-8 hours, and then the precipitate being filtered, washed with distilled water, dried in air and calcined at desired temperature for 2-8 hours, giving the inorganic metal oxide nanoparticles; or (b) preparing metal nanoparticles by carrying out a reductive reaction until 5-20 times amount of reductant as that of metal ions is injected into the reactor, giving a colloid solution of the metal nanoparticles with narrow metal particle size distribution.