Chemistry 2002 JAMB Past Questions - Question 27: Ethanol can easily be produced by

Correct Answer

A

Explanation

Ethanol, also known as ethyl alcohol, can be produced through various processes, with the most common ones involving the fermentation of sugars and subsequent distillation. Here are the general steps involved in ethanol production:

1. **Feedstock Selection:**
  - Ethanol can be produced from a variety of feedstocks, including sugarcane, corn, wheat, barley, and other crops. The choice of feedstock depends on factors such as regional availability, cost, and the efficiency of ethanol extraction.

2. **Fermentation:**
  - The most common method of ethanol production is through fermentation. Microorganisms, such as yeast, are used to convert sugars into ethanol and carbon dioxide. The sugars can come from the breakdown of starches or sugars present in the chosen feedstock.

  - For example, in the production of ethanol from corn, the corn starch is first converted into sugars through the action of enzymes. Yeast is then introduced to ferment these sugars into ethanol and carbon dioxide.

3. **Distillation:**
  - After fermentation, the ethanol-water mixture (known as the beer) needs to be separated and purified. Distillation is the primary method used for this purpose. Ethanol has a lower boiling point than water, so the mixture is heated, and ethanol vapor is collected and condensed back into liquid form.

4. **Dehydration (Optional):**
  - In some cases, an additional step called dehydration is performed to remove any remaining water and increase the ethanol concentration. This is often done using molecular sieves or other dehydration methods.

5. **Denaturation (Optional):**
  - Ethanol produced for industrial purposes, such as fuel, may undergo a denaturation process to make it unfit for human consumption. This typically involves adding small amounts of denaturants like methanol or other chemicals.

It's important to note that the specific details of the production process can vary depending on the feedstock used and the intended application of the ethanol. Additionally, advancements in technology may lead to new and more efficient methods of ethanol production in the future.