Recovery of lysine values by removal of ammonium chloride from lysine containing liquors

摘要

Lysine.2HCl is converted to lysine.HCl by neutralization and crystallization with ammonia in an organic solvent. After removal of the precipitated lysine.HCl, the solvent mixture containing NH4Cl, some lysine.HCl and organic solvent is fractionated to recycle the solvent and then acidified with hydrochloric acid to salt out a major portion of the NH4Cl. The remaining solution is then combined with a lysine precursor to produce lysine.2HCl. This novel method ensures virtually complete recovery of lysine from the processing system.