Process for producing suspensions

Patent metadata

Field	Value
Publication number	US-10059602-B2
Application number	US-201414889928-A
Country	US
Kind code	B2
Filing date	May 6, 2014
Priority date	May 8, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Process for producing a suspension by precipitation of a solid from a solution, wherein at least two solutions of salts are combined with one another in a stirred vessel so as to form a sparingly soluble solid, where
portions of suspension are taken off continuously or discontinuously, the portions taken off in this way are processed in a combination of two separation apparatuses, where gas is separated off in a first separation apparatus which is selected from liquid-gaseous separation apparatuses, and mother liquor is separated off from precipitated sparingly soluble solid in a second separation apparatus selected from solid-liquid separation apparatuses, and the mother liquor is taken off, and the solid which has been separated off or enriched in this way is returned to the reaction mixture.

First claim

The invention claimed is:

1. A process for producing a suspension, comprising:
combining at least two solutions of salts in a reaction mixture in a stirred vessel so as to form a suspension of a sparingly soluble solid,
taking off portions of the suspension continuously or discontinuously, and
processing the portions taken off in a combination of a first separation apparatus, which is a liquid-gas separation apparatus, and a second separation apparatus, which is a solid-liquid separation apparatus, or in a baffle plate thickener having a first and a second section, of which the first section functions as a liquid-gas separation apparatus and the second section functions as a solid-liquid separation apparatus,
wherein
gas is separated off in the first separation apparatus, or in the first section of the baffle plate thickener,
mother liquor is separated off from precipitated sparingly soluble solid in the second separation apparatus, or in the second section of the baffle plate thickener, and taken off so as to obtain the solid, and
the solid is reintroduced into the reaction mixture.

2. The process according to claim 1 , wherein a concentration of solid in the mother liquor is increased in the second separation apparatus or in the second section of the baffle plate thickener.

3. The process according to claim 1 , wherein
the combination of the first and second separation apparatuses is used, and
the liquid-gaseous separation apparatus is configured as a tube which has an angle of from 1 to 30° and has a connection to a line at an upper end.

4. The process according to claim 1 , wherein the sparingly soluble solid is at least one of a hydroxide and a carbonate of at least one transition metal.

5. The process according to claim 1 , wherein the sparingly soluble solid is at least one of a hydroxide and a carbonate of nickel, cobalt and/or manganese.

6. The process according to claim 1 , wherein
the combination of the first and second separation apparatuses is used, and
the second separation apparatus is a sedimenter.

7. The process according to claim 1 , wherein
gas bubbles are introduced into the suspension by stirring in the stirred vessel,
the combination of the first and second separation apparatuses is used, and
the gas bubbles are separated off in the first separation apparatus.

8. The process according to claim 1 , wherein
the combination of the first and second separation apparatuses is used, and
from 0.5 to 20% by volume of the suspension is in the first and second separation apparatuses.

9. The process according to claim 1 , wherein the solutions of salts are introduced during the taking-off of mother liquor and reintroduction of the solid.

10. The process according to claim 1 , wherein from 0.1 to 5% by weight of the precipitated solid is present in the liquid-gas separation apparatus or in the first section of the baffle plate thickener.

Assignees

• Basf Se

Inventors

• Schroedle Simon

Classifications

• C01G53/006 Primary

  Chemistry & Metallurgy · mapped topic

• C01B32/60

  Preparation of carbonates or bicarbonates in general (of percarbonates C01B15/10; of specific carbonates or bicarbonates according to the cation C01B-C01G) · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title