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Mechanical pulping gives a much higher yield than chemical pulping because it

  • A.requires no water
  • B.removes the hemicellulose selectively
  • C.retains the lignin in the pulp
  • D.uses less energy per tonne

Answer: C

Yields above ninety per cent are possible because nothing is dissolved away, but the retained lignin makes the paper weak and prone to yellowing. Newsprint is the classic product. Chemical pulping sacrifices half the wood for strength.

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