Device and method for producing suspensions or wet pastes of nanopowders or ultra-fine powders

Patent metadata

Field	Value
Publication number	US-9480964-B2
Application number	US-201113825520-A
Country	US
Kind code	B2
Filing date	Sep 20, 2011
Priority date	Sep 21, 2010
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A device and a method for producing suspensions or wet pastes of nanoparticles or ultra-fine particles. The method comprises: introducing a flow of particles of nanometric or submicronic size into a first compartment of a chamber having a bulk density between 15 and 100 g/L; forming, in the first compartment, a spray of droplets between 1 and 10 micrometers in size, by injecting a solvent in liquid or gas form into a second compartment of the device and passing said solvent through the filtering means, the solvent being chosen from the solvents which are liquid at ambient temperature and at atmospheric pressure; stopping the formation of the spray when the entire quantity of particles contained in the first compartment forms, as required, with the solvent, a suspension comprising between 80 and 99.9% solvent, if the solvent is introduced into the second compartment in liquid form, or a wet paste comprising between 1 and 10% solvent, if the solvent is introduced into the second compartment in gas form; recovering the suspension or wet paste formed.

First claim

The invention claimed is:

1. A device for producing a suspension or a wet paste of particles of nanometric or submicronic size, comprising:
a chamber having a first and a second compartment arranged on top of each other;
filtering means arranged in the chamber between the first and second compartments, said means being suitable for preventing passage of particles of nanometric or submicronic size, while enabling passage of a fluid, from one compartment to the other;
means for introducing a flow of particles of nanometric or submicronic size having a bulk density between 15 and 100 g/L, situated in the first compartment;
means for discharging gas, situated in the second compartment;
means for injecting at least one fluid, situated in the second compartment, suitable for creating a flow from the filtering means, said flow being inverted with respect to the flow created by the means for introducing a flow of particles of nanometric or submicronic size;
means for outputting suspension or wet paste of particles;
wherein the device further comprises means for forming, in the first compartment, a spray formed from droplets of sizes between 1 and 10 microns, the means for forming a spray and the filtering means being a single element comprising a high-efficiency filter, as per the European standard EN 1822.

2. The device according to claim 1 , wherein the fluid injected by the injection means is a liquid solvent at ambient temperature, the fluid being injected in liquid form or in gaseous form and forming the droplet spray at the filter outlet.

3. The device according to claim 1 , wherein the high-efficiency filter is a metallic filter.

4. The device according to claim 1 , wherein the filter pore size is less than or equal to 200 nm.

5. The device according to claim 1 , wherein the first compartment is situated below the second compartment.

Assignees

• Maskrot Hicham
• Guizard Benoît
• Commissariat Energie Atomique

Inventors

• Maskrot Hicham
• Guizard Benoît

Classifications

• B01J4/02 Primary

  for feeding measured {, i.e. prescribed} quantities of reagents · CPC title

• B01J19/00

  Chemical, physical or physico-chemical processes in general; Their relevant apparatus · CPC title

• B01J19/26 Primary

  Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles · CPC title