Abstract
The saccharification of waste paper such as old handbill using hot compressed water (HCW) was carried out in a batch reactor of 6ml inner-volume and a semicontinuous reactor of 28ml inner-volume. Hindrance effects of added amount and particle size of calcium carbonate and promotive effect of several additives on saccharification of waste paper were examined. It was demonstrated that the sodium pyrophosphate and aluminum phosphate have a remarkable promotive effect in saccharification of a model system, mixture of cellulose and calcium carbonate powder with a few decades microns. However, sodium pyrophosphate and aluminum phosphate were slightly effective for waste paper compared to the model system, because of highly reactive nanosized calcium carbonate contained in the waste paper.It was suggested that organic acids formed from cellulose at an initial stage of the saccharification reacted with nanosized calcium carbonate prior to hydrolysis of cellulose by HCW, and that as the result, pH of the reaction solution was raised up and thermal decomposition of saccharide was promoted.
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