METHOD FOR LITHIUM CHLORIDE REGENERATION IN CHEMICAL INDUSTRY Russian patent published in 2017 - IPC C01D15/04 B01D1/00 B01D3/00 B01D9/02 

FIELD: chemistry.

SUBSTANCE: method for lithium chloride regeneration in chemical industry comprises plasticization and precipitation bath solution neutralisation with an aqueous solution of lithium hydroxide. Multicomponent starting mixtures contain 0 to 60% of dimethylacetamide (DMAA), 0 to 70% isobutyl alcohol (IBA), lithium chloride, hydrogen chloride, water and impurities - balance to 100%. These mixtures were separated to lithium chloride containing ones and not containing ones. The mixtures which do not contain lithium chloride are separated to mixtures containing DMAA and mixtures not containing DMAA. The liquid stream consisting of IBA and water is removed from the system. At that, the plasticization bath solution is rectified in two columns and the distillation residue mixture of the second column and the precipitation bath is evaporated by vacuum. Vacuum rectification of vacuum evaporator distillation residue, vacuum rectification of vacuum evaporator and the third column stripping product is performed to obtain dimethylacetamide (DMAA). The concentrated lithium chloride solution is crystallized in dimethylacetamide. The flow of concentrated lithium chloride is sequentially fed to vacuum rectification, crystallization and centrifugation. Lithium chloride complex salt - dimethylacetamide - is separated from the stock solution. Purified lithium chloride is obtained from the stock solution by repeated dilution with water and vacuum evaporation.

EFFECT: invention allows to obtain lithium chloride with a purity up to 95 percent and a high yield.

1 dwg