Acid Hydrolysis and Chemicals from Cellulosics
Acid hydrolysis of cellulosics can be divided into two groups: high temperature and low temperature. Approximately, 140°C can be considered the demarcation of the two types of processes. The low temperature acid process ranges from 80 to 140°C; most high temperature processes operate from 160 to 240°C. The main difference in the reaction results caused by the difference in the reaction temperature is the formation of furfural and its derivatives at a high temperature in the acidic solution. Furfural and related by-products represent a loss of sugar yield and create problems in subsequent fermentations due to the inhibitory effects of these by-products on living cells. The acid is also much more corrosive at a high temperature and the required special metal for equipment fabrication is costly.
KeywordsUronic Acid Sugar Yield Methyl Ethyl Ketone Xylose Isomerase Hemicellulose Hydrolysate
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