...Sodium metaphosphate (NaPO 3 ) n is produced by dehydration condensation of sodium dihydrogen phosphate (NaH 2 PO 4 ) , and various forms are obtained depending on the reaction temperature, heating time, cooling rate, etc. Below 400°C, a poorly soluble salt called Maddrell's salt is obtained. When heated to about 500°C via dihydrogen pyrophosphate (Na 2 H 2 P 2 O 7 ) , cyclo-sodium triphosphate (Na 3 (PO 3 ) 3 ) is produced. ... *Some of the terminology that mentions "Maddrell's salt" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…メタリン酸ナトリウム(NaPO3)nはリン酸二水素ナトリウムNaH2PO4の脱水縮合によって生成するが,反応温度,加熱時間,冷却速度などによって種々の形態のものが得られている。400℃以下ではマドレル塩Maddrell’s saltと呼ばれる難溶性塩が得られる。ピロリン酸二水素塩Na2H2P2O7を経て500℃程度にまで熱するとcyclo‐三リン酸ナトリウムNa3(PO3)3が生成する。… ※「Maddrell's salt」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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