FIELD: biotechnology.
SUBSTANCE: disclosed is a method of producing L-methionine and acetate. Method comprises enzymatically processing an O-acetylhomoserine fermentation liquor to produce L-methionine and an acetate source. Separating at least a portion of said L-methionine from acetate source to form separated L-methionine and a residual liquor comprising an acetate-source. Said separation is performed by at least two crystallisations, where first crystallisation is performed with addition of methionine from subsequent crystallisations. Recovering at least a portion of said acetate source from said residual liquor by forming residual liquor containing free acetic acid and separating said free acetic acid.
EFFECT: invention enables to obtain L-methionine with output of more than 92 % in form of crystals of high purity and acetate with output of 96 %.
32 cl, 10 dwg, 10 tbl, 7 ex
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