The Kraft Pulping Process
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Questions and Answers

Which process is the most commonly used pulping process worldwide?

  • Sulfate pulping process
  • Mechanical pulping process
  • Soda pulping process
  • Kraft pulping process (correct)

    • What percentage of lignin is dissolved during the Kraft pulping process?

  • 10%
  • 50%
  • 80% (correct)
  • 100%

    • Which chemicals are used as cooking liquor in the Kraft pulping process?

  • NaOH and NaCl
  • NaOH and Na2S (correct)
  • NaOH and Na2CO3
  • Na2O and Na2CO3

    • What is the main purpose of using sodium sulfide (Na2S) in the Kraft pulping process?

    <p>To darken the pulp color</p> Signup and view all the answers

    Which chemical is the key for completing the cooking process in the Kraft pulping process?

    <p>NaOH</p> Signup and view all the answers

    Which of the following is NOT a benefit of using sodium sulfide (Na2S) in the Kraft pulping process?

    <p>Increased penetration of the wood</p> Signup and view all the answers

    What percentage of hemicelluloses is dissolved during the Kraft pulping process?

    <p>50%</p> Signup and view all the answers

    Which of the following is a key factor in the Kraft pulping process?

    <p>Temperature</p> Signup and view all the answers

    What happens to lignin during the Kraft pulping process?

    <p>It goes into reactions with cooking liquor chemicals and splits into fragments</p> Signup and view all the answers

    What is the main purpose of the Kraft pulping process?

    <p>To dissolve lignin and separate it from the wood fibers</p> Signup and view all the answers

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