アルミノケイ酸塩の合成における原料混合比と生成物組成の関係

概要

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When Na_2SiO_3 and AlCl_3 solutions were mixed, the pH of mixed solution at a constant ratio was different according to the order of mixing, but the composition and pH of suspension in water were not different. The composition of the products varied with the mixing ratio of Na_2SiO_3 to AlCl_3. In the case of the mixing ratio below 1.7,aluminum hydrogen silicates were mainly obtained and the ratio of Si/Al in the products became the higher, the lower the mixing ratio was. When the mixing ratio increased from 1.7 to 2.0,aluminum began to be taken into silicate structure and sodium also began to be taken as counter ion of aluminosilicates, so that the products changed from aluminum hydrogen silicates to sodium aluminum aluminosilicates. Above 2.0 of the mixing ratio, all of aluminum was taken into the silicate structure and sodium was taken as the counter ion. As a result, sodium aluminosilicates, Na (AlSi_2O_6), were obtained. Then the pH of the solution in which Na_2SiO_3 and AlCl_3 were mixed was kept constant by pH-Statt with HCl or NaOH solution. The composition of products synthesized in strong alkaline solution was sodium aluminosilicates, Na (AlSi_2O_6), which was not affected by the mixing ratio. The composition of the product obtained in weak alkaline solution, however, changed according to the ratio of mixing.
公益社団法人日本薬学会の論文
1972-05-25