Claims
- 1. A process of separating NaCl from an NaCl-contaminated aqueous LiCl solution by concentrating the solution up to an LiCl content>25 wt-%, cooling the concentrated solution and separating the crystallized NaCl, comprising prior to concentrating or during concentrating or prior to cooling at least one water-soluble alkaline or alkaline earth hydroxide or at least one amine soluble in water and of low volatility is added to the NaCl-contaminated aqueous solution in an amount of 0.3 to 5 wt-% (based on LiCl), and that the concentrated solution is cooled to a temperature which lies between 0 and -15.degree. C.
- 2. The process as claimed in claim 1, comprising prior to concentrating, the solution is mixed with the hydroxide or the amine.
- 3. The process as claimed in claim 1, wherein the hydroxide is formed in situ by adding a corresponding amount of an alkaline or alkaline earth oxide to the solution.
- 4. The process as claimed in claim 1, wherein as hydroxide LiOH, NaOH, Ca(OH).sub.2 or Ba(OH).sub.2 is used, and as amine tetraethylenepentamine is used.
- 5. The process as claimed in claim 1, wherein the solution is concentrated to an LiCl content of 35 to 45 wt-%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
196 45 315 |
Nov 1996 |
DEX |
|
Parent Case Info
This application is a 371 of PCT/EP97/05994, international filing date Oct. 30, 1997.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP97/05994 |
10/30/1997 |
|
|
6/14/1999 |
6/14/1999 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/19966 |
5/14/1998 |
|
|
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
04 193711 |
Jul 1992 |
JPX |