Production of Activated Carbon Aiming at Advanced Use of Larch. (I). Surface Area of Activated Carbon Prepared from Larch Wood and Bark by a Batchwise Fluidization Process.:Surface Area of Activated Carbon Prepared from Larch Wood and Bark by a Batchwise

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Carbonization of powderd larch wood and bark, with diameter of 0.18-0.50mm, followed by steam activation was made in a batchwise fluidized bed reactor for the production of activated carbon as their advanced use. It is found that carbonization at 773K was optimum in term of specific surface area for activated carbon. In the subsequent steam activation of chars conducted at 1023, 1073 and 1173K for 0.5-3.0h, higher temperature and longer time gave larger surface area at the cost of the yield. This indicated a close relation between surface area and yield for activated carbons obtained. An activated larch wood char had the surface area of 1, 500m<SUP>2</SUP>/g as the maximum, and this value was equal or superior to those of activated carbons from fir wood, quercus wood and coconut shell. Larch bark char after activation also was almost equal to coalderived commercial activated carbons in the surface area. These results showed a promising aspect of conversion of the whole larch into activated carbon as higher value added product compared to the conventional use as packing and palette materials.
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