Process for making flash activated hydrotalcite
    1.
    发明授权
    Process for making flash activated hydrotalcite 失效
    制备闪光活化水滑石的方法

    公开(公告)号:US5955048A

    公开(公告)日:1999-09-21

    申请号:US534996

    申请日:1995-09-27

    摘要: There is provided a flash activated hydrotalcite which, when extruded to sizes of about 1/16 inch or more, has a crush load strength of at least about 7 pounds. The process for making this extrudate includes: (a) providing a hydrotalcite compound; (b) heating said compound for less than two seconds to one or more temperatures above about 482.degree. C. (900.degree. F.); (c) cooling said heated compound; (d) collecting said cooled compound; (e) forming said compound into an extrudate; and (f) reactivating said extrudate by heating to one or more temperatures above about 400.degree. C. (752.degree. F.) for about 20 minutes or more. Further strength improvements are achieved by exposing these extrudates to steam for at least about 8 hours prior to step (f).

    摘要翻译: 提供了一种闪光活化的水滑石,其当挤出至约+ E,1/16 + EE英寸或更大的尺寸时,具有至少约7磅的压碎载荷强度。 制造该挤出物的方法包括:(a)提供水滑石化合物; (b)将所述化合物加热至少于两秒钟至高于约482℃(900°F)的一个或多个温度; (c)冷却所述加热的化合物; (d)收集所述冷却的化合物; (e)将所述化合物形成挤出物; 和(f)通过加热至高于约400℃(752°F)的一个或多个温度约20分钟或更长时间来再活化所述挤出物。 通过在步骤(f)之前将这些挤出物暴露于蒸汽至少约8小时来实现进一步的强度改进。

    Production of suspension fertilizers from orthophorphoric acid
    2.
    发明授权
    Production of suspension fertilizers from orthophorphoric acid 失效
    从邻位生产悬浮肥料

    公开(公告)号:US4375980A

    公开(公告)日:1983-03-08

    申请号:US21879

    申请日:1979-03-19

    IPC分类号: C05B7/00

    CPC分类号: C05B7/00

    摘要: An improved process for the production of concentrated, high-grade, nitrogen-phosphate (N--P.sub.2 O.sub.5) base suspension fertilizer from wet-process or other phosphoric acids and ammonia. The process involves addition of small proportions of fluosilicic acid during preparation of the suspension to cause modification of monoammonium phosphate crystals to shapes and sizes that do not settle during vibration such as occurs during shipment.

    摘要翻译: 一种从湿法或其他磷酸和氨生产浓缩高品位氮磷(N-P2O5)基悬浮肥料的改进方法。 该方法包括在制备悬浮液期间加入少量氟硅酸,以使磷酸二氢铵晶体改变成在运输过程中发生的振动期间不稳定的形状和尺寸。

    Production of suspension fertilizers from orthophosphoric acid
    3.
    发明授权
    Production of suspension fertilizers from orthophosphoric acid 失效
    从正磷酸生产悬浮肥料

    公开(公告)号:UST986001I4

    公开(公告)日:1979-09-04

    申请号:US947684

    申请日:1978-10-02

    IPC分类号: C05B7/00

    CPC分类号: C05B7/00

    摘要: an improved process for production of concentrated high-analysis nitrogen-phosphate base suspension fertilizer by ammoniation of wet-process or other orthophosphoric acids in two stages. The process improvement involves the addition of a small amount (0.1-0.5 percent) of a crystal modifier, fluosilicic acid, for prevention of settling of crystals in the suspension during vibration such as that which occurs during shipment. With use of the crystal modifier, the monoammonium phosphate crystals formed are small and needlelike, and suspension fertilizers with excellent shipping, storage, and handling properties are produced with an N:P.sub.2 O.sub.5 weight ratio in the range of highest solubility, about 0.27 to 0.33.

    Production of urea-ammonium polyphosphates from urea phosphate
    5.
    发明授权
    Production of urea-ammonium polyphosphates from urea phosphate 失效
    从磷酸尿素生产尿素 - 聚磷酸铵

    公开(公告)号:US4292067A

    公开(公告)日:1981-09-29

    申请号:US120949

    申请日:1980-02-12

    IPC分类号: C05B13/06 C05C9/00

    CPC分类号: C05B13/06

    摘要: Crystalline urea phosphate mixed with sufficient quantities of previously produced urea-ammonium polyphosphate liquid to provide fluidity is pyrolyzed batchwise in one stage to give molten urea ammonium polyphosphate containing up to 50 percent of the phosphate as polyphosphate. Water or aqua ammonia can be substituted for the polyphosphate liquid if certain prescribed steps in proper sequence are followed. Heat from ammoniation of the urea phosphate provides all of the heat for pyroloysis. The molten urea-ammonium polyphosphate is then processed into high-analysis liquid fertilizer.

    摘要翻译: 与足量的先前生产的尿素 - 聚磷酸铵液体混合以提供流动性的结晶尿素磷酸盐在一个阶段间歇地热解,得到含多达50%磷酸盐的多磷酸盐的熔融尿素铵多磷酸盐作为多磷酸盐。 如果遵循适当顺序的某些规定步骤,则可以用水或氨水代替多磷酸盐液体。 尿素磷的氨化的热量提供了用于热解的所有热量。 然后将熔融的尿素 - 多磷酸铵加工成高分析液体肥料。

    Production of urea-ammonium polyphosphates from urea phosphate
    10.
    发明授权
    Production of urea-ammonium polyphosphates from urea phosphate 失效
    从磷酸尿素生产尿素 - 聚磷酸铵

    公开(公告)号:UST973004I4

    公开(公告)日:1978-08-01

    申请号:US838503

    申请日:1977-10-03

    IPC分类号: C05B13/06

    CPC分类号: C05B13/06 C05G1/00 C05C9/00

    摘要: a process for the production of high-purity urea-ammonium polyphosphate fertilizers from crystalline urea orthophosphate derived from the reaction of wet-process acid and urea. Initially, urea phosphate was pyrolyzed in one stage to give molten urea-ammonium polyphosphates that contained up to 95 percent of the phosphate as polyphosphate, dependent upon the reaction conditions used. Heat to effect condensation of orthophosphate with urea to form polyphosphate was provided by steam. Reaction conditions ranging from a retention time of 1 minute at 350.degree. F to 30 minutes at 260.degree. F were satisfactory. The pyrolyzate contained mixtures of urea, ammonium orthophosphate, and ammonium polyphosphates and was dissolved in aqua ammonia to yield clear liquid fertilizers containing 12 to 15 percent nitrogen and 18 to 29 percent P.sub.2 O.sub.5. Addition of either urea to the process to maintain a urea:biuret ratio of at least 16, or about 2 pounds NH.sub.3 per unit P.sub.2 O.sub.5 to the pyrolysis reactor prevented biuret precipitation in the liquid fertilizers. Granulation of urea-ammonium polyphosphate melt by conventional means gave solids containing 19 to 21 percent N and 45 to 47 percent P.sub.2 O.sub.5. Supplementary, secondary, or micronutrient-containing materials may be incorporated in the liquid or solid products.