磷酸氢二钠，7558-79-4，Sodium Phosphate, Dibasic

磷酸氢二钠     DISODIUM PHOSPHATE

一、化学名：磷酸氢二钠

二、分子式：Na₂HPO₄，Na₂HPO₄·2H₂O，Na₂HPO₄·12H₂O

三、分子量：无水物：141.96；二水物：177.99；十二水物：358.14

四、CAS：无水物：7558-79-4；二水物：10028-24-7；十二水物：10039-32-4

五、性状：白色或无色斜方晶体或单斜晶系结晶，易溶于水，不溶于乙醇，相对密度为1.52，熔点34.6℃，180℃时失去结晶水成无水物。

六、用途：食品中作焙制品，防止氧化变色，奶制品的乳化剂，防止蛋白凝固，固体饮料起螯合，乳化缓冲作用。

七、包装：内衬聚乙烯塑料袋．外套复合塑料编织袋，每袋净重25kg。

八、贮存与运输：本品应贮存在干燥通风清洁的库房中，装载运输时要轻装轻放，防止包装破损，防止受潮、受热，运输过程中防止雨淋受潮，应与有毒物品隔离。

1、Chemical Name: Disodium Phosphate

2、Molecular Formula:, Na₂HPO₄，Na₂HPO₄·2H₂O，Na₂HPO₄·12H₂O

3、Molecular Weight: Anhydrous: 141.99; Dihydrate: 177.96; Dodecahydrate: 358.14

4、CAS: Anhydrous: 7558-79-4; Dihydrate: 10028-24-7; Dodecahydrate: 10039-32-4

5、Character: It is white or colorless rhombic crystalline or prismatic crystal. It’s easily soluble in water, but insoluble in ethanol. The relative density is 1.52 and melting point is 34.6℃. If heated to 180℃, it will lose crystal water and convert to anhydrous.

6、Usage: In food industry, it is used as agent for baking to avoid oxidation stain and as emulsifier in dairy product to prevent egg white from solidification. It is also used as emulsifier and chelating agent for solid drinks.

7、Packing: It is packed with polyethylene bag as inner layer and a compound plastic woven bag as outer layer. The net weight of each bag is 25kg.  

8、Storage and Transport: It should be stored in a dry and ventilative warehouse, kept away from heat and moisture during transportation, unloaded with care so as to avoid damage. Furthermore, it must be stored separately from poisonous substances.