Method of separation and extraction of D-lactic acid from sodium D-lactate fermentation liquid
A technology for lactic acid fermentation and fermentation broth, applied in the field of bioengineering, can solve the problems of low degree of automation in the separation process, low product quality and high energy consumption, and achieve the target of reducing nitrogen content and post-decolorization costs, reducing energy consumption and acidification. short time effect
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Embodiment 1
[0028] The D-lactic acid fermentation broth of the Bacillus production strain, wherein the concentration of sodium D-lactate is 100g / L, has no residual sugar, and the pH of the fermentation broth is 6.0. Take the fermented D-sodium lactate fermentation broth and separate the bacterial cells through a disc centrifuge; then perform microfiltration and ultrafiltration to separate macromolecular proteins and some pigments. The molecular weight cut-off of the ultrafiltration membrane is 1000; For decolorization, powder activated carbon is used for decolorization, the decolorization pH is neutral, the decolorization temperature is 60°C, and the decolorization time is 30 minutes; the decolorized fermentation broth is sent to an ion exchange column for ion exchange, and the fermentation broth is first passed through a cation exchange resin. Anion exchange resin; finally, the fermented broth after ion exchange is sent to the evaporator for vacuum evaporation to obtain D-lactic acid with...
Embodiment 2
[0030] The D-lactic acid fermentation liquid of the strain produced by Bacillus, wherein the concentration of sodium D-lactate is 120g / L, has no residual sugar, and the pH of the fermentation liquid is 5.8. Take the D-sodium lactate fermentation broth after fermentation and directly enter the microfiltration and ultrafiltration system to separate macromolecular proteins and some pigments. The molecular weight cut-off of the ultrafiltration membrane is 5000; the fermentation broth is decolorized, and the decolorization is carried out by nanofiltration membrane. , the molecular weight cut-off used by the nanofiltration membrane is 300; the decolorized fermentation broth is sent to an ion exchange column for ion exchange, and the fermentation broth first passes through a cation exchange resin and then an anion exchange resin; finally, the ion-exchanged fermentation broth is sent to an evaporation column. D-lactic acid with an optical purity of 99% and a content of 91% was obtained...
Embodiment 3
[0032] The D-lactic acid fermentation broth of the Bacillus production strain, wherein the concentration of sodium D-lactate is 110g / L, has no residual sugar, and the pH of the fermentation broth is 6.0. The fermented D-sodium lactate fermentation broth is taken directly into the microfiltration and ultrafiltration system to separate macromolecular proteins and some pigments. The molecular weight cut-off of the ultrafiltration membrane is 20,000; the fermentation broth is decolorized, and the decolorization is carried out in an activated carbon column. Granular activated carbon is selected, the decolorization pH is 6.0, the decolorization temperature is 60°C, and the decolorization time is 30 minutes; the decolorized fermentation broth is sent to an ion exchange column for ion exchange, and the fermentation broth is first passed through a cation exchange resin and then an anion exchange resin; The fermented broth after ion exchange is sent to an evaporator for vacuum evaporatio...
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