Kraft Pulping and Recovery Process basicsRecovery Basic Process Flow Pulp Mill Dale Proctor 2003 White Liquor •NaOH •Na2S Pulp Mill •Cooking •Washing Black Liquor Turpentine pulp Raw Material Structure of Wood Fibers Lumen P S1 S2 S3 Middle Lamella Chemical Structure of Fibers O O HO OH O O HO OH O HO OH O O HO OH O Xyla n n 100 200 Substituted with O H 3CO HO OH O HO 2C O CH 3 25 35 % Extractives 2 8