Abstract
The solvolysis of bigtooth aspen wood and pure cellulose (filter paper) by anhydrous hydrogen fluoride (HF) vapor was investigated. Each substrate was exposed to a 100% HF vapor stream at 0·101 MPa and 27°C to 77°C for a given reaction time. The water-soluble reaction products were then post-hydrolyzed in 2 n trifluoroacetic acid for 1 h at 121°C. With this two-step hydrolysis, maximum glucose yields of 85% from wood and 94% from pure cellulose were obtained. HPLC analysis of the water-soluble reaction products obtained before post-hydrolysis revealed that glucose and glucosyl fluoride repolymerized to oligomers during vapor-phase HF solvolysis of cellulose. The oligosaccharide product distribution was dependent on reaction time, temperature and sample water content.
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