Purification method of feed-grade isoleucine

The invention is applicable to the field of isoleucine purification, and provides a feed-grade isoleucine purification method which comprises the following steps: filtering isoleucine fermentation liquor by using a ceramic membrane to obtain ceramic membrane filtrate; then adding activated carbon fo...

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Bibliographische Detailangaben
Hauptverfasser: WANG CHANGHAI, FANG XIJIE, WANG SONGJIANG, GUO CHUANZHUANG, WANG JIANBIN, LI JUNLIN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention is applicable to the field of isoleucine purification, and provides a feed-grade isoleucine purification method which comprises the following steps: filtering isoleucine fermentation liquor by using a ceramic membrane to obtain ceramic membrane filtrate; then adding activated carbon for decolorization to obtain a decolorized solution; further filtering through a nanofiltration membrane to obtain nanofiltration membrane filtrate; the nanofiltration membrane filtrate enters a concentration evaporator to be concentrated, solid matter of feed liquid is concentrated to 23%-25%, and concentrated liquid is obtained; the concentrated solution enters a cooling crystallization tank, the cooling speed is controlled to be 8-13 min/DEG C, the temperature is reduced to 30-35 DEG C, centrifugation is conducted, and finally isoleucine is obtained. In conclusion, the method is simple in extraction process, high in product yield and quality and environment-friendly, and the production cost is greatly reduced. 本发明