Name: Polythene: An Addition Polymer
Uploaded: 2019-07-19
Duration: 5 min 25 s
Description: Despite the harmful effects of polythene bags, they still remain the most common shopping bag carried by people around the world. In this video let's learn h...

Question

Describe the industrial production of ethanol from molasses under the following head:

Labelled diagram

Accepted Answer

The labelled diagram of the industrial production of ethanol from molasses is as follows:

Industrial manufacture of ethanol (ethyl alcohol) is done using the fermentation method. In this process, sugar is first separated from cane–sugar juice by crystallization. The thick, yellow syrupy substance left behind is called molasses. Molasses are diluted by adding water to obtain a $8 - 10 %$ solution. Then ammonium sulphate, which promotes yeast reproduction, is added to the solution. A small amount of sulphuric acid is also added to the solution. Sulphuric acid also promotes the growth of yeast and kills other microorganisms. The mixture is filled in a tank (as shown in the labelled diagram) and $5 %$ yeast is added to the tank and the mixture is left for two to three days, in the absence of air, at $25 - 30 ° C$ . Yeast is a type of fungus which has the enzymes invertase and zymase. Invertase converts the sucrose present in molasses into glucose and fructose. Ethanol is obtained by fermentation of glucose and fructose in the presence of zymase. In this process, carbon dioxide gas is released with rapid bubbling and is removed via the outlet tube.

Describe the industrial production of ethanol from molasses under the following head:

Labelled diagram

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