How Is Sodium Hydroxide Used in Paper Production?

💡 The Answer

• In the Kraft process, sodium hydroxide digests wood chips by dissolving lignin, the binding agent in wood fibers.
• This strong base breaks down lignin into soluble fragments, leaving behind cellulose fibers for papermaking.
• The alkaline solution also saponifies resins and oils, further purifying the pulp.
• The process operates at high temperature and pressure to maximize efficiency and yield.