Abstract
The changes of constituents of Softwood (Red Pine) and hardwood (Pasania) during water hydrolysis were investigated. The results were as follows : (1) The yield of softwood was higher than that of hardwood.(2) The majority of soluble lignin was extracted in the initial reaction.(3) The accessible pentasan that was removed rapidly in the initial reaction was present in softwood.(4) The dissolving rate of pentosan of hardwood was larger than that of softwood.(5) The dissolving rate of cellulose of softwood was larger than that of hardwood.(6) The pentosan and lignin contents were independent on the temperature, and the relationship between the rate of removal and yield appeared to be a straight line. From these results, it could be supposed that lignin and pentosan contents of hydrolyzed wood were determined by yield of wood after hydrolysis.
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