Process for the preparation of ammonium polyphosphate
    3.
    发明授权
    Process for the preparation of ammonium polyphosphate 失效
    多磷酸铵制备方法

    公开(公告)号:US5277887A

    公开(公告)日:1994-01-11

    申请号:US951406

    申请日:1992-09-25

    IPC分类号: C01B25/40

    CPC分类号: C01B25/405

    摘要: To prepare essentially water-insoluble, long-chain ammonium polyphosphate, in a first stage, ammonium orthophosphate and phosphorus pentoxide are reacted in the presence of gaseous ammonia in a reactor equipped in its interior with mixing, kneading and comminution apparatus, until the drive motor of the reactor passes through the second current peak in its current consumption/time diagram. In a second stage, the material discharged from the reactor is then fed to a disk dryer, the heating disks of which are maintained at temperatures of 240.degree. to 300.degree. C., whereas its lower cooling disk has temperatures of 5.degree. to 45.degree. C. The material, which covers the disks of the disk dryer at a layer thickness of 5 to 20 mm, has a residence time of 35 to 70 minutes in the disk dryer, while ammonia-containing gas is continuously passed through the disk dryer. Finally, the ammonia-containing gas exiting the disk dryer is freed from water vapor contained therein by condensation and the ammonia-containing gas is reheated prior to its entry into the disk dryer.

    摘要翻译: 为了制备基本上不溶于水的长链多磷酸铵,在第一阶段中,在气态氨存在下,在其内部装有反应器的混合,捏合和粉碎装置中使正磷酸铵和五氧化二磷反应,直到驱动马达 的电流通过其电流消耗/时间图中的第二电流峰值。 在第二阶段中,从反应器排出的材料然后被供给到盘式干燥器,盘式干燥器的加热盘保持在240摄氏度至300摄氏度的温度,而其下部冷却盘具有5度至45度的温度 覆盖盘式干燥器的盘厚为5〜20mm的材料在盘式干燥机中的停留时间为35〜70分钟,而含氨气体连续通过盘式干燥机。 最后,离开盘式干燥机的含氨气体通过冷凝而不含水蒸汽,并且含氨气体在进入盘式干燥器之前被再加热。