Preparation method of lactic acid
A technology for inoculating lactic acid bacteria and lactic acid, which is applied in the field of biomass chemical engineering, can solve the problems of lack of efficient utilization methods and inability to use non-starch polysaccharides, and achieve the effects of low price, high compatibility and high productivity
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Embodiment 1
[0032] Using 20% corn hydrolyzate, adding 0.2% yeast, ethanol fermentation for 30h, the fermented liquid contains 27.6g / L sugar and 45.2g / L ethanol. Take 1L of the fermentation residue after the ethanol has been separated and heat it at 121°C for 60min. Lactic acid bacteria adaptive culture system contains furfural residue 5g / l, KH 2 PO 4 0.5g / l, MgSO 4 ·7H 2 O 0.5g / l, NaCl 0.1g / l and CaCO 3 20g / l, prepared with water. The culture temperature of the adaptive culture was 32°C, the culture time was 36 hours, and the pH value was 6.0. Take 0.17L of the treated fermentation residue and add it to the fermenter, add 5% (w / v) furfural slag for fermentation, make up the total fermentation volume to 1L with water, solid CaCO 3 5% (w / v), the addition of cellulase was 15FPU / g furfural residue, the addition of adaptive lactic acid bacteria was 1.25g / L, the fermentation temperature was 42°C, the pH value was 6.0, and the lactic acid was 31.0g / L after 120h, producing The ratio is...
Embodiment 2
[0034] Using 20% corn hydrolyzate, adding 0.2% yeast, ethanol fermentation for 30h, the fermented liquid contains 27.6g / L sugar and 45.2g / L ethanol. Take 1L of the fermentation residue after the ethanol has been separated and heat it at 100°C for 10min. Lactic acid bacteria adaptive culture system contains furfural residue 5g / l, KH 2 PO 4 0.5g / l, MgSO 4 ·7H 2 O 0.5g / l, NaCl 0.1g / l and CaCO 3 20g / l, prepared with water. The culture temperature of the adaptive culture was 32°C, the culture time was 36 hours, and the pH value was 6.0. Take 0.17L of the treated fermentation residue and add it to the fermenter, add 5% furfural slag for fermentation, make up the total fermentation volume to 1L with water, solid CaCO 3 , 5% (w / v), cellulase addition 15FPU / g furfural slag, adaptive lactic acid bacteria addition 1.0g / L, fermentation temperature 38°C, pH 6.0, lactic acid after 108h was 27.9g / L, The yield was 89.9% (calculated based on the monosaccharide in the raffinate and th...
Embodiment 3
[0036] Using 20% corn hydrolyzate, adding 0.2% yeast, ethanol fermentation for 30h, the fermented liquid contains 27.6g / L sugar and 45.2g / L ethanol. Add 1 mol / L hydrochloric acid to 1L of the fermented residue from which ethanol has been separated, place it at 25°C for 1 hour, heat at 100°C for 10 minutes, and then adjust it to neutral with 10% NaOH for later use. Lactic acid bacteria adaptive culture system contains furfural residue 5g / l, KH 2 PO 4 0.5g / l, MgSO 4 ·7H 2 O 0.5g / l, NaCl 0.1g / l and CaCO 3 20g / l, prepared with water. The culture temperature of the adaptive culture was 32°C, the culture time was 36 hours, and the pH value was 6.0. Take 0.17L of the treated fermentation residue and add it to the fermenter, add 5% (w / v) furfural slag for fermentation, make up the total fermentation volume to 1L with water, solid CaCO 3 , 5% (w / v), cellulase addition amount 20FPU / g furfural residue, adaptive lactic acid bacteria addition amount 1.5g / L, fermentation temperatur...
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