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Section4 Energy made by fermentation
Bioethanol
Bioethanol which used for fuel is made by fermentation. Let’s know how to make it.
1.Prepairing, Saccharification
First, make wood or corn’s fiber soft. There are water heat processing and sodium hydroxide processing to make soft.After this, do saccharification. Saccharification means decompose a fiber by enzyme. To make bioethanol more efficient, we have to prepare accurately and choose the best combination of enzyme.
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2.fermentation
Next of saccharification process is fermentation. Put the liquids and microbes into the tank and wait for few days. They may be alcoholic fermented. Yeast mainly used at this process. (Alcoholic fermentation is done by yeast. Look “Basic knowladge3”)
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3.Distillation
Eliminate ethanol from fermented liquid.
Basically, use some distillation machine and improve accuracy of distillation.
Finally, 99.5% or more of absolute ethanol for fuel is completed.
Usage example
These days, hybrid car is being popular. In America and Brazil whose amount of ethanol production is top class, the number of ethanol-gasoline hybrid car is being larger and larger.
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Bioethanol emit carbon dioxide when they burn. However, them will used for plant’s photosynthesis, and plant will be material of ethanol. In conclusion, the amount of carbon dioxide won’t increase. This phenomenon called ”Carbon neutral”.
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