EP 4240696 A1 20230913 - PROCESS FOR THE PRODUCTION OF LITHIUM HYDROXIDE
Title (en)
PROCESS FOR THE PRODUCTION OF LITHIUM HYDROXIDE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON LITHIUMHYDROXID
Title (fr)
PROCÉDÉ POUR LA PRODUCTION D'HYDROXYDE DE LITHIUM
Publication
Application
Priority
- EP 20205404 A 20201103
- CA 2021051528 W 20211029
Abstract (en)
[origin: WO2022094696A1] The present invention relates to a process for the production of lithium hydroxide by crystallization of lithium hydroxide monohydrate from a solution of lithium nitrate, comprising the following steps: (a) providing a lithium nitrate-containing solution with a concentration of lithium nitrate of 13.0 – 15.4 mol/kgw, preferably 13.5 – 15.4 mol/kgw, more preferably 14.0 – 15.0 mol/kgw (kgw = kg H2O), (b) adding an approximately stoichiometric amount of sodium hydroxide to the lithium nitrate-containing solution at a temperature within the range of 70 – 85 °C, preferably 75 – 85 °C, in order to crystallize lithium hydroxide monohydrate, and (c) separating the formed lithium hydroxide monohydrate at a temperature within the range of 70 – 85 °C, preferably 75 – 85 °C, preferably by centrifugation and optionally washing of the separated lithium hydroxide monohydrate with water. The process is efficient and lead tohigh yield of lithium hydroxide monohydrate.
IPC 8 full level
C01D 15/02 (2006.01); C30B 7/14 (2006.01); C30B 29/10 (2006.01)
CPC (source: EP)
C01D 15/02 (2013.01); C01P 2006/80 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2022094696 A1 20220512; AR 123954 A1 20230125; EP 4240696 A1 20230913
DOCDB simple family (application)
CA 2021051528 W 20211029; AR P210103007 A 20211029; EP 21887939 A 20211029