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Approximately twenty percent of the wood carbohydrates that are dissolved from softwood chips during a pretreatment with green liquor (GL) are principally derived from glucose and mannose. The dominant chemistries during GL pretreatment are saccharide readsorption and mannan dissolution. The pentose saccharides are more easily adsorbed onto fibers than the hexose saccharides. Mannose, a hexose saccharide, undergoes degradation easily displaying no readsorption during the process. A higher GL concentration can enhance both re-adsorption and degradation. An important finding was that during the pretreatment phase hydrogen sulfide reacts with wood to form a bond that appears to be chemical in nature. The chemical bonding of sulfur in wood correlates with carbohydrate retention in which a higher level of bonded sulfur results in higher carbohydrates retention.
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Low Capital, High Return Modifications to Kraft Pulping Operations Part II. Effect of Green Liquor o