籾殻灰からのSiCl_4の製造(第3報) : フーリエ変換光音響分光法によるアルカリ及びアルカリ土類金属塩添加籾殻燃焼灰の塩素化反応機構の分析

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The chlorination of a mixture of rice hull ashes and carbon containing alkaline and alkaline earth salts was investigated by FT-IR-PAS. It was thought that the relative ratio of totally symmetric SiO_4 stretching vibration (v_1) to antisymmetric SiO_4 degenerate stretching vibration (v_3) in infrared frequencies for SiO_2 whose constituent oxygen atoms occupy the corners of a tetra-hedron shows structural changes of SiO_2 network. The results of v_1/v_3 of SiO_2 before and after chlorination showed that the values of v_1/v_3 increased and the chlorination was accelerated because K^+ increased. The v_1/v_3 of SiO_2 by addition of Na^+, Mg^<2+> and Ca^<2+> was smaller than that of K^+ and these additives did not accelerate the chlorination. KCl, NaCl, MgCl_2 and CaCl_2 which formed during the chlorination melted at 900℃.
1991-08-01