Beginner Topic 796 of 1102 Organic Chemistry
Ethanol Production
Made by fermentation of sugars or hydration of ethene.
In-depth explanation of Ethanol Production
Ethanol is produced industrially by two main routes. Fermentation uses yeast to convert sugars into ethanol and carbon dioxide, a process that stops at about 15 percent alcohol because the yeast cannot survive higher concentrations. Hydration of ethene with acid catalysis gives high-purity ethanol from petrochemical feedstock. Ethanol for use as fuel must be dehydrated by distillation and molecular sieves, because the mixture forms an azeotrope at about 95.6 percent ethanol by mass, which cannot be separated by simple distillation.
Going deeper: Ethanol Production
Key ideas: Fermentation: glucose to 2 ethanol plus 2 CO2 by zymase in yeast, at 25 to 37 C, limited to about 15 percent ethanol because yeast dies. Fractional distillation yields 95.6 percent (azeotrope) ethanol; absolute alcohol needs a drying agent or benzene distillation. Industrial route: ethene hydration with phosphoric acid catalyst at 300 C and 60 to 70 atm. Denatured spirit contains methanol and pyridine.
Common mistakes and connections: Students expect distillation to give 100 percent ethanol, forgetting the azeotrope. Another error is saying fermentation requires oxygen; it is anaerobic. Links to hydration of alkenes, biofuels and carbon-neutral claims, and enzyme catalysis.
Visualization of Ethanol Production
Fermentation gives a dilute ethanol solution of roughly 15 percent that needs distillation; ethene hydration gives a much more concentrated product. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Yeast converts glucose to ethanol and carbon dioxide, C6H12O6 giving 2 C2H5OH plus 2 CO2.
Frequently asked questions about Ethanol Production
What is Ethanol Production?
Made by fermentation of sugars or hydration of ethene.
Is Ethanol Production a beginner, intermediate or advanced topic?
Ethanol Production is a beginner topic in Organic Chemistry. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Ethanol Production?
Study these earlier topics in Organic Chemistry first: Properties of Alcohols, Oxidation of Alcohols, Lucas Test.
What comes after Ethanol Production?
The next topics in Organic Chemistry are Phenols and Ethers.
Can I practise Ethanol Production with quizzes?
Yes. The interactive lesson includes a self-check question on Ethanol Production, and the Organic Chemistry quiz draws on every topic in this area.
Where Ethanol Production fits in Organic Chemistry
Ethanol Production is topic 68 of 148 in Organic Chemistry.