塩化ナトリウム-硫酸カリウム混合塩の水蒸気吸着

概要

論文の詳細を見る
As a part of the hygroscopic studies of powder mixtures, the behavior of NaCl-K_2SO_4 mixtures in a water vapor adsorption process were investigated. The mixing of the two salts was carried out in vacuo. The water vapor adsorption isotherms of NaCl, K_2SO_4 and their mixtures were determined. The surface areas and x-ray diffraction intensities of the mixed salts were measured under various water vapor pressures. At the relative water vapor pressures above 0.34 on NaCl and 0.65 on K_2SO_4, water adsorbed on those salts was released partly owing to the decrease in the surface area of the salts. This decrease in the surface area may be attributed to the combination of the following two factors; the aggregation of the powder particles due to the cohesion force of the adsorbed water and the dissolution-deposition effect between the particle surface and the adsorbed water layers. Both the surface area and the water vapor adsorption capacity of the mixed sample began to increase when the sample was pretreated at the relative vapor pressure above 0.34. The X-ray diffraction data of the mixtures indicated that NaCl reacted with K_2SO_4 in the presene of water adsorbed as follow: NaCl+K_2SO_4→KCl+(Na, K)_2SO_4 The increase in the surface area of the mixed sample seemed to be caused by deposition of micro-crystals formed by the reaction. The minimum thickness of the adsorbed water required to cause the above reaction was determined to be 2.0 and 1.3 molecular layors for NaCl and K_2SO_4, respectively.
社団法人日本材料学会の論文
1974-07-15

塩化ナトリウム-硫酸カリウム混合塩の水蒸気吸着

スポンサーリンク

概要

著者

関連論文

スポンサーリンク