Molecular distillation combined with extraction is used to extract lactic acid in fermentation broth
A technology of molecular distillation and fermented liquid, applied in chemical instruments and methods, preparation of organic compounds, carboxylate preparation, etc., to achieve the effects of reducing emissions, strong extraction ability, and saving resources
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Embodiment 1
[0013] The sterilized fermentation broth is filtered to remove solid impurities to obtain a filtrate; the filtrate is distilled under reduced pressure to remove low boilers and part of water to obtain a concentrated solution, and the mass fraction of lactic acid in the concentrated solution is 50%; the concentrated solution is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower still residue; the mixture of isopropyl ether and isopropyl acetate with a mass ratio of 1:1 is used as No. 1 extractant, and the No. 1 extractant is used for the first extraction of the molecular distillation tower still residue. The volume ratio of the extractant to the residual liquid of the molecular distillation tower is 5:1, to obtain the upper phase and the lower phase, the upper phase is the first extraction phase, and the lower phase is the first raffinate phase; the first extraction phase is carried out normally. Pressure distillation to obtain the...
Embodiment 2
[0015] The sterilized fermentation broth is filtered to remove solid impurities to obtain a filtrate; the filtrate is distilled under reduced pressure to remove low boilers and part of water to obtain a concentrated solution, and the mass fraction of lactic acid in the concentrated solution is 70%; the concentrated solution is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower still raffinate; a mixture with a mass ratio of isopropyl ether and isopropyl acetate of 5:1 is used as No. 1 extractant, and the No. 1 extractant is used to extract the molecular distillation tower still raffinate for the first time, No. 1 The volume ratio of the extractant to the residual liquid of the molecular distillation tower is 10:1, to obtain the upper phase and the lower phase, the upper phase is the first extraction phase, and the lower phase is the first raffinate phase; Pressure distillation to obtain the overhead distillate and atmospheric dist...
Embodiment 3
[0017] The sterilized fermentation broth is filtered to remove solid impurities to obtain a filtrate; the filtrate is distilled under reduced pressure to remove low boilers and part of water to obtain a concentrated solution, and the mass fraction of lactic acid in the concentrated solution is 60%; the concentrated solution is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower still residue; the mixture of isopropyl ether and isopropyl acetate with a mass ratio of 3:1 is used as No. 1 extractant, and the No. 1 extractant is used to extract the molecular distillation tower still residue for the first time. The volume ratio of the extractant to the residual liquid of the molecular distillation tower is 8:1, to obtain the upper phase and the lower phase, the upper phase is the first extraction phase, and the lower phase is the first raffinate phase; the first extraction phase is carried out normally. Pressure distillation to obtain t...
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