Pulping and Bleaching PSE 476/Chem E 471. Lecture #19 Oxygen Bleaching and NaOH extraction. Agenda. Process Overview Advantages/Disadvantages Reduction of Oxygen: Oxygen species Lignin Reactions Carbohydrate Reactions Effect of Process Variables NaOH extraction.
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Oxygen Bleaching and NaOH extraction
Side Chain Cleavage
Oxygen BleachingEffect of NaOH on Carbohydrates
NaOH ExtractionLignin Reactions
Purpose: to dissolve and then to remove compounds made alkali soluble in the proceeding acid delignification.
Lignin (2 functions)
NaOH Extraction Carbohydrate Reactions
NaOH Extraction Conditions (1)
NaOH Extraction Conditions (2)
NaOH Extraction Conditions (3)