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    • 2. 发明授权
    • Method for producing ammonium polyphosphate
    • 多磷酸铵生产方法
    • US4832928A
    • 1989-05-23
    • US76119
    • 1987-07-21
    • John A. ParkerRubin FeldmanRobert L. Bryant
    • John A. ParkerRubin FeldmanRobert L. Bryant
    • C01B25/40
    • C01B25/405
    • A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315.degree.+/-15.degree. C. The slurry is reacted on a hot, continuously moving surface and forms ammonium polyphosphate in an ammonia atmosphere. Preferably, the pre-mixed slurry is added to a screw-type extruder, where the material comes in contact with the ammonia along the preheated moving surfaces of the extruder. The ammonium polyphosphate is scraped from the extrusion screw into a container with minimum handling. The material can be ground to a finer consistency if desired.
    • 在约315℃±15℃的控制温度下,在预混合浆料中,通过尿素和多磷酸在宽范围的分子量下反应连续制备多磷酸铵的方法。 一个热的,持续移动的表面,并在氨气氛中形成多磷酸铵。 优选地,将预混合的浆料加入到螺杆式挤出机中,其中材料沿着挤压机的预热移动表面与氨接触。 将多磷酸铵从挤出螺杆中刮下至最少的处理容器。 如果需要,材料可以研磨成更细的一致性。