• 作者： 陳政民；張奉文
• 作者服務機構： 國立中央大學化學工程研究所
• 中文摘要： 本研究利用酸洗程序及熱解反應之前處理步驟，去除稻殼中碳與二氧化矽以外之成份，並將處理後所得之高純 度碳/二氧化矽進行氯化反應以製造四氯化矽。結果中發現，以3N的鹽酸進行酸洗程序可有效地除去稻殼中之無機金屬不純物。而當熱解?度高於633K及熱解時間大於30分鐘時，熱解之殘餘率則趨於一定值。在633K?936K間 進行熱解時，通氮氣較不通氮氣所得之稻殼殘餘量小；高於936K時，熱解殘餘率則不受氮氣流量的影響。氯化實驗 結果顯示，熱解?度與熱解時間皆不影響稻殼之氯化反應性。於1373&進行氯化時，增加氣體流率反而會降低轉化 率。當氯氣濃度高於25vol%，增加氯氣濃渡對反應並無促進作用。結果中亦發現，提高氯化?度可增加二氧化矽之 轉化率；且於實驗?度範圍?，氯化反應於前15分鐘即近完成，其後之反應則相當緩慢。
• 英文摘要： C/SiO2 originating from rice husk was used for the manufacture of SiCl4. The metallic impurity content of this husk could be greatly decreased by appropriate leaching procedures. Leaching of husk in 3N HC1 was proved to be effective in substantially removing most of the metallic ingredients. Pyrolysis of the husk, which precedes the chlorination, led to a very intimate mixture of the silica and carbon. With a pyrolysis temperature above 633K and duration of more than 30min, the husk reached an essentially constant weight. At 633-936K, less solid residue remained with nitrogen flowing than without nitrogen flowing during the pyrolysis. However, the effect was not appreciable when the pyrolysis temperature was above 936K. The pyrolysis temperature and time had no effect on chlorination of husk. At higher chlorination temperature 1373K, increasing the gas flow rate decreased the final conversion. When the chlorine fraction was larger than 25vol%, there was no significant enhancement in the chlorination reaction. The results also showed that the chlorination reaction almost occurred within 15min, the subsequent rate was very small, and that the conversion of silica increased with chlorination temperature.
• 中文關鍵字： rice husk; acid leaching; pyrolysis; chlorination; silicon tetrachloride
• 英文關鍵字： --