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10.2 Chemical Wood Pulping - United States Environmental ...
www3.epa.govdesired product, by the wood species available, and by economic considerations. 10.2.2 Kraft Pulping 10.2.2.1 Process Description1-The kraft pulping process (see Figure 10.2-1) involves the digesting of wood chips at elevated temperature and pressure in "white liquor", which is a water solution of sodium sulfide and sodium hydroxide.