| abstract |
In a method for purifying TEDA in which triethylenediamine (TEDA) is vaporized, gaseous TEDA is passed through a liquid solvent, and the TEDA is crystallized from the liquid solvent, the mother liquor obtained after crystallization of TEDA is immiscible with the solvent of the mother liquor. Or extract with a slightly miscible, easily dissolvable TEDA, and return to the process the TEDA-removing mother liquor obtained after extraction and / or the TEDA-concentrated extractant used for extraction. |