Method for producing ethanol by magnetic-field-assisted gas stripping fermentation
A magnetic field-assisted, fermentation technology, applied in fermentation, biofuel and other directions, can solve problems such as low air-lifting efficiency, and achieve the effects of improving air-lifting efficiency, promoting growth, and improving fermentation intensity
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Embodiment 1
[0016] Fermentation using air-lift fermenters such as figure 1 , the aspect ratio is 6:1, and the working volume is 1L. The inert gas is introduced from the bottom of the reactor, and a wire mesh is used as a gas distributor. The gas is provided by steel cylinders, and the flow rate is controlled by a rotameter. The magnetic field is provided by a 100-turn energized solenoid with a strength of 3.14mT. Ethanol and water in the exhaust gas are collected through condensation. The initial glucose concentration of the fermentation was 150g / L, the yeast inoculation amount was 1g / L, and the fermentation temperature was 37°C. CO was introduced into the bottom of the fermenter 2 as a carrier gas. In the early stage of fermentation, keep a low ventilation rate and play a stirring role. When the ethanol concentration in the fermented mash reaches 40g / L, the carrier gas ventilation rate is increased to 3vvm, and the stripping tail gas is collected by a condenser with a condensation ...
Embodiment 2
[0018] The same equipment as in Example 1 was used. The magnetic field is provided by a permanent magnet with a strength of 1.15mT. Ethanol and water in the exhaust gas are collected through condensation. The initial glucose concentration of the fermentation was 220 g / L, the yeast inoculation amount was 5 g / L, and the fermentation temperature was 35°C. Nitrogen was introduced into the bottom of the fermenter as a carrier gas. In the early stage of fermentation, keep a low ventilation rate and play a stirring role. When the ethanol concentration in the fermented mash reaches 40 g / L, the carrier gas ventilation rate is increased to 3vvm, and the stripping tail gas is collected by a condenser with a condensation temperature below -20°C to collect the removed ethanol solution. When the glucose concentration in the fermented mash is lower than 10g / L, the fermentation ends, and the end time is 32 hours, which is 11 hours shorter than the normal fermentation time and 4 hours short...
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