Context: To make pulp from wood, a chemical pulping process separates lignin from cellulose fibres. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose; this preserves the length of the cellulose fibres. Paper made from chemical pulps are also known as wood-free papers–not to be confused with tree-free paper; this is because they do not contain lignin, which deteriorates over time. The pulp can also be bleached to produce white paper, but this consumes 5% of the fibres; chemical pulping processes are not used to make paper made from cotton, which is already 90% cellulose.

Question: What is separated from the cellulose fibres?
Answer: lignin

Question: What type of paper is paper made from chemical pulps known as?
Answer: wood-free

Question: What percentage of fibres are wasted in the bleaching process?
Answer: 5%

Question: What percentage of cotton is cellulose?
Answer: 90%

Question: What is separated from pulp to make wood?
Answer: Unanswerable

Question: What is wood dissolved in to get clean from cellulose?
Answer: Unanswerable

Question: What is combined with cellulose fibers when making pulp?
Answer: Unanswerable

Question: What is combined with lignin when making pulp?
Answer: Unanswerable

Question: When separating lignin from cellulose fibers, what is cooking oil dissolved in?
Answer: Unanswerable

Question: What is combined with the cellulose fibres?
Answer: Unanswerable

Question:  What type of paper is wood made from chemical pulps known as?
Answer: Unanswerable

Question:  What percentage of fibres are used in the bleaching process?
Answer: Unanswerable

Question:  What percentage of cotton is not cellulose?
Answer: Unanswerable