An important step in the manufacture of pulp in paper industry from woody tissues of plants is

Options

A. Preparation of pure cellulose by removing lignin
B. Removal of oils present in the wood by treatment with suitable chemicals
C. Removal of water from the wood by prolonged heating at approximately `50^(@)C`
D. Treatment of wood with chemical that breakdown cellulose

Answer

To answer the question regarding an important step in the manufacture of pulp in the paper industry from woody tissues of plants, we can break down the process into the following steps:

### Step-by-Step Solution:

1. **Cutting the Wood**: The first step in the pulp manufacturing process involves cutting down logs of wood into smaller chips. This increases the surface area for the subsequent processes.

2. **Heating the Chips**: The wood chips are then heated to a specific temperature. This heating process helps in breaking down the lignin and other components of the wood.

3. **Formation of Pulp**: After heating, the wood chips undergo chemical treatment to form pulp. This pulp contains cellulose, lignin, and other impurities.

4. **Bleaching Process**: The pulp formed is typically dark due to the presence of lignin and other impurities. To achieve the desired white color of paper, a bleaching process is carried out.

5. **Chemical Treatment in Bleaching**: The bleaching process involves the use of various chemicals such as chlorine dioxide, hydrogen peroxide, oxygen, sodium hypochlorite, and chlorine gas. These chemicals help in removing lignin and other impurities, resulting in a whiter pulp.

6. **Extraction of Pure Cellulose**: The ultimate goal of the pulp manufacturing process is to extract pure cellulose from the wood. This is achieved by effectively removing lignin and other unwanted materials through the bleaching process.

### Conclusion:
The most important step in the manufacture of pulp in the paper industry from woody tissues of plants is the **preparation of pure cellulose by removing lignin**. This step is crucial as it determines the quality of the pulp and, subsequently, the quality of the paper produced.

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