METHOD FOR THE PRODUCTION OF SUSPENSIONS OF NANOPARTICULATE SOLIDS

• US 20090093553A1
• Filed: 05/08/2007
• Published: 04/09/2009
• Est. Priority Date: 05/09/2006
• Status: Abandoned Application

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Breiner, Thomas, Kleine Jager, Frank, Benohr, Alexander, Prolss, Julian
• Application Number:
  US12/299,336
• Publication Number:
  US 20090093553A1
• Time in Patent Office: Days
• US Class Current: 516/33
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 35/04 Metal borides
• CPC Class Codes: C01B 6/06 Hydrides of aluminium, gallium, indium, thallium, germanium, tin, lead, arsenic, antimony, bismuth or polonium; Monoborane; Diborane; Addition complexes thereof
• CPC Class Codes: C01B 6/243 containing only hydrogen, aluminium and alkali metals, e.g. Li(AlH4)
• CPC Class Codes: C01G 1/00 Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general electrolytic production of inorganic compounds C25B1/00
• CPC Class Codes: C01G 39/06 Sulfides
• CPC Class Codes: C01G 9/03 Processes of production using dry methods, e.g. vapour phase processes
• CPC Class Codes: C01P 2004/51 Particles with a specific particle size distribution
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C04B 2235/3227 Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3256 Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate
• CPC Class Codes: C04B 2235/421 Boron
• CPC Class Codes: C04B 35/5805 based on borides
• CPC Class Codes: C04B 35/58092 based on refractory metal silicides
• CPC Class Codes: C04B 35/62665 Flame, plasma or melting treatment
• CPC Class Codes: C09C 1/043 Zinc oxide

Abstract

The invention relates to a process for preparing suspensions of nanoparticulate solids, wherein the solids present in the suspension are present in the form of nanoparticulate primary particles or very small aggregates.

Claims

1. A process for preparing suspensions of nanoparticulate solids, which comprises

a) conducting a feedstock or feedstocks and possibly a further component through a reaction zone while subjecting them to a thermal reaction in which nanoparticulate primary particles are formed,

b) subjecting the reaction product obtained in step a) to a rapid cooling and

c) introducing the cooled reaction product obtained in step b) into a liquid to form a suspension in which the nanoparticle solids are present in the form of nanoparticulate primary particles or very small aggregates.

2. The process according to claim 1, wherein the feedstock comprises an element-hydrogen compound or an elemental metal selected from the group consisting of boron, zinc, lanthanum, tin, cerium, titanium, silicon, molybdenum, tungsten, platinum, rhodium, ruthenium and aluminum.

3. The process according to claim 1, wherein the feedstock used is aluminum and the further component used is hydrogen, which are converted to aluminum hydride in the reaction zone.

4. The process according to claim 1, wherein the feedstocks used are lanthanum oxide and boron or boron compounds, which are converted to lanthanum hexaboride in the reaction zone.

5. The process according to claim 1, wherein the feedstocks used are lithium and aluminum and the further component used is hydrogen, which are converted to lithium aluminum hydride in the reaction zone.

6. The process according to claim 1, wherein the particle size of the nanoparticulate solids is in the range from 1 to 500 nm.

7. The process according claim 1, wherein the residence time of the feedstocks and of any further components in the reaction zone is between 0.002 s and 2 s.

8. The process according to claim 1, wherein the thermal conversion of the reaction gas proceeds at a pressure in the range from 0.05 bar to 5 bar.

9. The process according to claim 1, wherein the rapid cooling in step b) is effected with a cooling rate of at least 10⁴ K/s.

10. The process according to claim 1, wherein the rapid cooling in step b) is effected to a temperature which is below one third of the melting or decomposition temperature of the product in Kelvin.

11. The process according to claim 1, wherein the liquid used in step c) is white oil, tetrahydrofuran, diglyme, Solvent Naphtha, water or 1,4-butanediol.

12. The process according to claim 1, wherein a wet electrostatic precipitator or a Venturi scrubber is used in step c).

13. The process according to claim 1, wherein step b) comprises the addition of a modifier.

14. The process according to claim 13, wherein a quench gas and the modifier are added simultaneously.

15. The process according to claim 2, wherein the feedstock used is aluminum and the further component used is hydrogen, which are converted to aluminum hydride in the reaction zone.

16. The process according to claim 2, wherein the feedstocks used are lanthanum oxide and boron or boron compounds, which are converted to lanthanum hexaboride in the reaction zone.

17. The process according to claim 2, wherein the feedstocks used are lithium and aluminum and the further component used is hydrogen, which are converted to lithium aluminum hydride in the reaction zone.

18. The process according to claim 2, wherein the particle size of the nanoparticulate solids is in the range from 1 to 500 nm.

19. The process according to claim 3, wherein the particle size of the nanoparticulate solids is in the range from 1 to 500 nm.

20. The process according to claim 4, wherein the particle size of the nanoparticulate solids is in the range from 1 to 500 nm.