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1. 发明授权

US4162300A Production of Maddrell salt 失效
标题翻译： Maddrell盐的生产
公开(公告)号：US4162300A
公开(公告)日：1979-07-24
申请号：US945502
申请日：1978-09-25
申请人： Renate Adrian , Raban VON Schenck , Klaus Somme , Hermann Weber
发明人： Renate Adrian , Raban VON Schenck , Klaus Somme , Hermann Weber
IPC分类号： C01B25/445 , C01B15/16 , C01B25/26
CPC分类号： C01B25/445
摘要： Pure Maddrell salt is produced by heating sodium phosphate to temperatures of 250.degree. to 420.degree. C. The sodium phospate used as starting material is sodium trimetaphosphate or a mixture of sodium trimetaphosphate with Maddrell salt, monosodium orthophosphate or disodium pyrophosphate, the mixture containing Na and P in a molar ratio of 1:1. Prior to heating the starting material, it is admixed with 0.5 to 5 weight% of orthophosphoric acid, polyphosphoric acid, phosphorus pentoxide or at least one salt of a volatile base forming polyphosphoric acid at the temperatures specified. The resulting mixture is calcined over the period necessary to transform the starting material to Maddrell salt.
摘要翻译：纯麦德雷尔盐是通过将磷酸钠加热至250-420℃的温度而制得的。用作原料的磷酸钠是三偏磷酸钠或三偏磷酸钠与马德雷尔盐，正磷酸单钠或焦磷酸二钠的混合物，混合物含有Na和 P的摩尔比为1：1。在加热原料之前，在指定的温度下与0.5-5重量％的正磷酸，多磷酸，五氧化二磷或至少一种形成多磷酸的挥发性碱的盐混合。将所得混合物在将起始材料转化为Maddrell盐所需的时间内煅烧。

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