Ethanol Production: Is My Yield Limited to 13%?

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In summary, the experiment of making ethanol from sugar using yeast is limited to a yield of around 13%, as yeast dies at that concentration of alcohol. However, it is possible to increase the yield by finding ways to distill off ethanol as the process goes on. The yield also depends on the yeast strain, as some are able to survive higher concentrations. A comparison chart of different yeast strains can be found for further reference.
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Unstoppable13
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So for an experiment I must make ethanol from sugar using yeast. I've read that yeast dies at around 13% concentration of alcohol. So does that mean that my experiment is limited to a 13% yield?
 
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Yes, give or take. There will always be some bacteria in the mix that are hardier than the rest, but once your yeast is dead, it's not going to be making anymore ethanol for you. Maybe if you can find a way to distill off ethanol as you go so that it doesn't build up too much, you can increase your overall yield.
 
  • #3
A lot depends on the yeast strain, some are able to survive higher concentrations. 15 seconds googling yielded this comparison chart:

http://www.winemakermag.com/guide/yeast
 
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1. What is ethanol production and why is it limited to 13% yield?

Ethanol production is the process of converting sugar or starch into ethanol, a type of alcohol. The 13% yield limit refers to the maximum amount of ethanol that can be produced through fermentation, as the yeast used in the process cannot survive in high ethanol concentrations.

2. Is there a way to increase the yield of ethanol production beyond 13%?

Yes, there are methods such as using genetically modified yeast strains or adding enzymes to the fermentation process that can increase the yield of ethanol production beyond 13%. However, these methods may not be cost-effective or sustainable in the long term.

3. Is the 13% yield limit a universal standard for all types of ethanol production?

No, the 13% yield limit is specific to the traditional fermentation process used in ethanol production. Other methods such as distillation or molecular sieves can produce ethanol with higher yields, but they are more expensive and require specialized equipment.

4. How does the 13% yield limit affect the production of biofuels?

The 13% yield limit can be a limiting factor in the production of biofuels, as higher ethanol yields are needed to make them more cost-effective and competitive with traditional fossil fuels. Research is ongoing to find ways to increase the yield of ethanol production for biofuels.

5. Are there any potential risks or drawbacks to increasing the yield of ethanol production beyond 13%?

Yes, increasing the yield of ethanol production beyond 13% can lead to a higher concentration of ethanol in the final product, which can have negative effects on engine performance and emissions. It can also require additional processing steps and resources, making it less environmentally friendly and cost-effective.

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