LITHIUM HYDROXIDE CHLORINATION METHOD Russian patent published in 2004 - IPC

FIELD: industrial inorganic synthesis.

SUBSTANCE: method of chlorination lithium hydroxide solution with chlorine/air mixture comprises four-step contacting of chlorine/air mixture with lithium hydroxide solution in presence of iron-nickel catalyst. Chlorination of lithium hydroxide solution is accomplished in the first two contacting steps (first and second absorbers) to achieve acid medium (pH ≤5.5) and thereby lithium carbonate precipitate formed upon chlorination is converted into soluble lithium chloride. Alkaline medium in third and fourth contacting steps (3^rd and 4^th absorbers) provide required chlorine trapping degree. Periodically, without stopping gas treatment process, direction of feeding of solution and chlorine/air mixture is changed. Thereafter, lithium hydroxide solution is chlorinated in 3rd and 4th absorbers to acid medium (pH ≤5.5).

EFFECT: achieved complete chlorination of lithium hydroxide, omitted clogging of pipelines and equipment with lithium carbonate and avoided use of aqueous hydrochloric acid in chlorination steps.

2 dwg