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焦磷酸钠

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焦磷酸钠[1]
IUPAC名
Tetrasodium diphosphate
别名 E 450c
识别
CAS号 7722-88-5  ✓
13472-36-1((decahydrate))  ✓
13472-36-1 (十水合物)
SMILES
InChI
EINECS 231-767-1
RTECS UX7350000
性质
化学式 Na4P2O7
摩尔质量 265.90 g·mol⁻¹
外观 无色固体
密度 2.53 g·cm−3 (无水物)
1.82-1.84 g·cm−3 (十水合物)
熔点 970 °C (无水物)
94 °C 失去结晶水 (十水合物)
溶解性 50 g/L (20 °C)
危险性
欧盟分类 刺激性 (Xi)
闪点 不可燃
若非注明,所有数据均出自一般条件(25 ℃,100 kPa)下。

焦磷酸钠(英语:Sodium pyrophosphate,TSPP),化学式Na4P2O7

性质

无水焦磷酸钠是一种白色结晶粉末,在空气中易吸收水分而潮解;十水合焦磷酸钠是一种无色单斜结晶或白色结晶或结晶性粉末,在干燥空气中易风化。加热至100°C时失去结晶水。易溶于水,水溶液呈碱性,不溶于醇。水溶液在70°C以下尚稳定,煮沸时则水解成磷酸氢二钠。具有较强的pH缓冲性,对金属离子有一定的螯合作用。[2][3] [4]

制备

磷酸氢二钠薄片在160~240°C之间发生加热聚合,经冷却后粉碎,制得无水焦磷酸钠成品。

用途

用作金属离子的螯合剂,例如电镀液中铜的络合剂。机械加工中,用作除锈剂。用作双氧水的稳定剂。与保险粉配制漂毛助剂,羊毛脱脂剂。水处理中用作软水剂,锅炉除垢剂。牙膏中使用磷酸氢钙时,加入焦磷酸钠使形成胶体,起稳定作用。化工生产和食品工业中用作分散剂、抗絮凝剂、乳化剂和品质改良剂。也用作其他焦磷酸盐的生产原料。

参考资料

  1. ^ Record of CAS RN 7722-88-5 in the GESTIS Substance Database from the IFA英语Institute for Occupational Safety and Health
  2. ^ 中国化工产品大全 上卷,Bc284 无水焦磷酸钠,页257
  3. ^ 中国化工产品大全 上卷,Bc286 结晶焦磷酸钠,页259
  4. ^ [焦磷酸钠字典-Guidechem.com (英文). [2011-12-23]. (原始内容存档于2016-03-05).  焦磷酸钠字典-Guidechem.com (英文)]
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焦磷酸钠
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