Method for preparing solids from a mixture of at least two malachite powders

Patent metadata

Field	Value
Publication number	US-10744489-B2
Application number	US-201816006065-A
Country	US
Kind code	B2
Filing date	Jun 12, 2018
Priority date	Jun 13, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

The invention relates to a method for preparing a solid comprising a step of mixing a set of compounds comprising at least two Cu 2 (OH) 2 CO 3 powders of different particle sizes and at least one binder and the use of the solid prepared by means of this method.

First claim

The invention claimed is:

1. Method for preparing a solid comprising the steps of:
a)_mixing a set of compounds comprising at least two Cu 2 (OH) 2 CO 3 powders with different particle sizes and at least one binder;
b)_contacting the mixture of step a) with an aqueous solution and kneading the paste thus obtained;
c)_extruding the paste kneaded in step b) at a pressure of between 3 and 25 MPa;
d)_calcinating the extrudates at a temperature of between 140° C. and 500° C. and for a duration of between 10 minutes and 6 hours under a gaseous flow comprising oxygen.

2. Method according to claim 1 , wherein the said set of compounds comprises 0.1 to 99.9 wt. % of a first malachite powder, the D 50 of which is between 1 and 15 μm and 99.9 to 0.1 wt. % of a second malachite powder, the D 50 of which is between 25 and 100 μm, the weight percentage being expressed relatively to the total weight of the malachite powders.

3. Method according to claim 1 , wherein the said set of compounds is dry-mixed in step a), i.e. without adding liquid.

4. Method according to claim 1 , wherein the said binder is selected from clays, or selected from the group consisting of alumina, a precursor of alumina, silica and mixtures thereof.

5. Method according to claim 1 , wherein the amount of binder used in the preparation method is such that the said binder represents less than 50 wt. % of the prepared solid.

6. Method according to claim 1 , wherein the said aqueous solution of the said step b) contains an acidic or basic peptizing agent.

7. Method according to claim 6 , wherein the said aqueous solution of the said step b) contains nitric acid, the ratio of HNO 3 mass/metal oxides mass being between 0.5 and 10 wt. %.

8. Method according to claim 6 , wherein the said basic peptising agent is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonia, tetraethylammonium hydroxide (TEAOH), ammonium carbonate and mixtures thereof, the ratio of the basic peptizing agent mass/metal oxides mass being between 1 and 10 wt. %.

9. Method according to claim 1 , wherein the aqueous solution of the said step b) is an aqueous solution with no added acid or base.

10. Method according to claim 1 , wherein the extrudates obtained from step c) are dried at a temperature of between 70 and 160° C. for a duration of between 1 and 24 hours before being calcined in step d).

11. Method according to claim 1 , wherein step d) of calcination is carried out at a temperature of between 200° C. and 500° C.

Assignees

• Axens
• Ifp Energies Now

Inventors

• Bazer-Bachi Delphine
• Chiche David
• Lopez Joseph
• Serres Thomas
• Frising Tom
• Ducreux Olivier
• Euzen Patrick

Classifications

• B01J35/36

  Mechanical strength · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B01D53/48

  Sulfur compounds · CPC title

• B01D2257/553

  Compounds comprising hydrogen, e.g. silanes · CPC title

• B01D2257/30

  Sulfur compounds · CPC title