An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the :
- Preparation of pure cellulose by removing lignin
- Removal of oils present in the wood by treatment with suitable chemicals
- Removal of water from the wood by prolonged heating at approximately 50°C
- Treatment of wood with chemical that breakdown cellulose
The Correct Option is A
Solution and Explanation
In the pulp and paper industry, the process of delignification is essential to remove lignin from wood and obtain pure cellulose fibers, which can be used to make high-quality paper products. Removing lignin is a critical step because lignin is a non-cellulosic component that can interfere with paper quality and strength.
So, the correct option is (A): Preparation of pure cellulose by removing lignin
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Concepts Used:
Polysaccharides
Polysaccharides are the most abundant hydrocarbons that exist in our food. They are long chains of hydrocarbons inclusive of smaller units called monosaccharides or monomers, related to each other through glycosidic linkages. Cellulose, starch, chitin, and glycogen are the most common polysaccharides found in food.
Characteristics of Polysaccharides:
- Desiccation does not cause Polysaccharides to structure crystals.
- They do not have a candied flavor.
- Water cannot infiltrate the molecules due to the numerous hydrogen bonds, making them hydrophobic.
- They are osmotically inactive and close-packed inside the cells. Many are water-insoluble.
- They are collections of hydrogen, carbon, and oxygen. 2:1 is the ratio of hydrogen to oxygen.
- They are carbohydrates with a molecular weight comparatively more excessive than other compounds. It is also possible to extract a white powder out of it.
Types of Polysaccharides:
- Homopolysaccharides
- Heteropolysaccharides