Hemihydrate type phosphoric acid process
    1.
    发明授权
    Hemihydrate type phosphoric acid process 失效
    半水合磷酸工艺

    公开(公告)号:US4196172A

    公开(公告)日:1980-04-01

    申请号:US865557

    申请日:1977-12-29

    CPC classification number: C01B25/2204 B01J19/002 C01B25/226 C01F11/46

    Abstract: Phosphate rock and sulfuric acid are reacted under conditions which result in the formation of calcium sulfate hemihydrate and phosphoric acid of about 35% to about 55% P.sub.2 O.sub.5. A two vessel reaction system is used in which the reaction slurry undergoes intra- and inter- vessel circulation (preferably through a draft tube). The solution portion of the slurry in the first vessel (the "dissolver") is preferably maintained at a negative sulfate concentration (i.e. excess Ca.sup.+2) and the solution in the second vessel (the "crystallizer") is preferably maintained at a positive sulfate ion concentration. Also preferred is that the second vessel be maintained at a reduced pressure, (e.g. to provide evaporation cooling). Better filtration rates can thus be obtained due to the favorable shape, dominant size and size distribution of the hemihydrate crystals. Most preferred is that a crystal modifier (e.g. a sulfonic acid, a sulfonic acid salt, tall oil fatty acids or alkoxylated or esterified tall oil fatty acids) be present in the crystallizer. Surprisingly, the sulfuric acid used in the process can be less (e.g., 0.5-10%) than the stoichiometric amount to convert the calcium in the feed phosphate rock to calcium sulphate.

    Abstract translation: 磷酸盐岩和硫酸在导致形成约35%至约55%的P 2 O 5的硫酸钙半水合物和磷酸的条件下反应。 使用二反应体系,其中反应浆料经受血管内和血管间循环(优选通过引流管)。 第一容器(“溶解器”)中的浆液的溶液部分优选维持在负硫酸盐浓度(即过量的Ca + 2),并且第二容器中的溶液(“结晶器”)优选保持在正 硫酸根离子浓度。 还优选的是将第二容器保持在减压下(例如提供蒸发冷却)。 因此,由于半水合物晶体的形状,主要尺寸和尺寸分布均可获得更好的过滤速率。 最优选的是在结晶器中存在结晶改性剂(例如磺酸,磺酸盐,妥尔油脂肪酸或烷氧基化或酯化的妥尔油脂肪酸)。 令人惊奇的是,该方法中使用的硫酸可以比用于将进料磷酸盐岩中的钙转化为硫酸钙的化学计算量少(例如0.5-10%)。

    Phosphoric acid ammoniation apparatus with water quench
    2.
    发明授权
    Phosphoric acid ammoniation apparatus with water quench 失效
    磷酸氨化装置用水淬火

    公开(公告)号:US4185075A

    公开(公告)日:1980-01-22

    申请号:US145493

    申请日:1971-05-20

    Abstract: An apparatus for reacting phosphoric acid and ammonia to form a molten reaction mixture, to which water can be added to produce an ammonium polyphosphate product, comprises:(A) fluid reactor means having a plurality of inlet means suitable for administration of reactants and positioned to provide for rapid ammoniation of the phosphoric acid with evolution of heat and aperatures to the other end providing exit means for the reaction mixture, said reactor means being adapted to the expulsion of the reaction mixture by steam generated in situ;(B) means for separating the steam from the liquid product solution and removal of said steam from the apparatus; and(C) columnar vessel means having outlet means at one end and enclosing at the other end the exit means of said fluid reactor means and a plurality of barrier means partially blocking said columnar vessel means in spaced-apart relationship and having aperatures therein for passage of reaction product therethrough and inlet means suitable for introduction of a quenching fluid (e.g., water).

    Abstract translation: 一种用于使磷酸和氨反应以形成熔融反应混合物的装置,可以向其加入水以产生多磷酸铵产物,其包括:(A)具有多个入口装置的流体反应器装置,其适于施用反应物并定位于 提供磷酸的快速氨化,并且向另一端释放热量,为反应混合物提供出口装置,所述反应器装置适于通过原位产生的蒸汽排出反应混合物; (B)用于从液体产物溶液中分离蒸汽并从设备中除去所述蒸汽的装置; 和(C)柱状容器装置,其一端具有出口装置,并且在另一端封闭所述流体反应器装置的出口装置,以及多个屏障装置,以间隔的关系部分地阻塞所述柱状容器装置,并且在其中具有用于通过的孔 的反应产物和适于引入淬火流体(例如水)的入口装置。

    Tamper-evident closure apparatus
    3.
    发明授权
    Tamper-evident closure apparatus 失效
    防篡改闭合装置

    公开(公告)号:US5450973A

    公开(公告)日:1995-09-19

    申请号:US310427

    申请日:1994-09-22

    CPC classification number: B65D51/1661 B65D41/0421 B65D41/3428

    Abstract: A tamper indicating closure comprising a one-piece molded plastic closure which threads onto the finish of a container such that when the closure is removed from the container, a tamper indicating band becomes separated from a lower end of a cap member of the closure. The tamper indicating band is joined to the closure along a weakened frangible line. The band includes a flexible Y-shaped annular flap segmented into tabs and attached to the lower end of the annular tamper band. When the closure is applied to the container, the annular band folds radially inward and up toward the cap member. The interior surface of the band and the first leg of the annular band include corresponding ratchet teeth which are designed to accommodate a varying degree of finish tolerances and which engage upon removal of the cap from the container. A second leg of the annular flap extends outwardly beneath a peripheral bead on the finish of the container when the closure is fully attached. Upon removal of the closure from the container, the second leg abuts underneath the peripheral bead to create resistance. The ratchet teeth on the band and flap are caused to engage with one another while the first leg wedges between the outside edge of the peripheral bead and the skin of the cap member. Further removal of the closure causes the tamper indicating band to sever from the cap member along the weakened line.

    Abstract translation: 一种防篡改指示封闭物,包括一体模制的塑料封闭物,其将螺纹拧到容器的端部上,使得当封闭件从容器移除时,防篡改指示带与封盖的盖构件的下端分离。 篡改指示带沿着弱化的易碎线连接到封闭件。 带包括分段成突片并附接到环形篡改带的下端的柔性Y形环形翼片。 当封闭件施加到容器时,环形带径向向内折叠朝向盖构件。 带的内表面和环形带的第一腿包括相应的棘轮齿,其被设计成适应不同程度的精加工公差,并且在从容器移除盖时啮合。 当封闭件完全连接时,环形翼片的第二条腿在容器端部的外周边缘的外侧向外延伸。 当从容器中取出封盖时,第二腿邻接在周边珠的下面以产生阻力。 带子和皮瓣上的棘轮齿彼此接合,而第一腿楔在周边珠的外边缘和盖构件的皮肤之间。 进一步去除封闭物导致篡改指示带沿着弱化线从盖构件断开。

    Phosphoric acid ammoniation apparatus
    5.
    发明授权
    Phosphoric acid ammoniation apparatus 失效
    磷酸氨化装置

    公开(公告)号:US4341739A

    公开(公告)日:1982-07-27

    申请号:US060044

    申请日:1979-07-24

    Abstract: Aqueous ammonium phosphate solutions can be produced using an apparatus comprising: a fluid reactor having a plurality of inlets at one end thereof suitable for the admission of phosphoric acid, ammonia and water, the inlets being so positioned as to provide for rapid ammoniation of the phosphoric acid with the evolution of heat, to produce a reaction product mixture containing a liquid portion and steam, the fluid reactor having an exit for the expulsion of the reaction products mixture at the other end thereof, by steam generated by the heat liberated in the ammoniation process; a columnar vessel having an outlet at one end and, at the other end, enclosing the exit of the fluid reactor, a plurality of barriers obturating the columnar vessel in a spaced-apart relationship, and having a plurality of apertures therein for the passage of reaction products mixture therethrough; an inlet quench device connected to the columnar vessel for introduction therein of a liquid aqueous quenching fluid; and, a device in communication with the exit of the fluid reactor, for separating steam from the liquid portion of the reaction mixture and removing the separated steam from the apparatus.

    Abstract translation: 磷酸铵水溶液可以使用以下装置制造,所述设备包括:流体反应器,其一端具有多个入口,其适于入口磷酸,氨和水,所述入口被定位成提供磷酸的快速氨化 酸,伴随着热的发展,产生含有液体部分和蒸汽的反应产物混合物,流体反应器具有用于在其另一端排出反应产物混合物的出口,其通过在氨化中释放的热产生的蒸汽 处理; 柱状容器在一端具有出口,另一端包围流体反应器的出口,多个屏障以隔开的关系塞满柱状容器,并且在其中具有多个孔以便通过 反应产物混合物通过其中; 连接到柱状容器的入口骤冷装置,用于在其中引入液态水淬火液; 以及与流体反应器的出口连通的装置,用于从反应混合物的液体部分分离蒸汽并从分离的装置中除去分离的蒸汽。

    Apparatus useful for wet process phosphoric acid production
    6.
    发明授权
    Apparatus useful for wet process phosphoric acid production 失效
    用于湿法磷酸生产的设备

    公开(公告)号:US4260584A

    公开(公告)日:1981-04-07

    申请号:US910163

    申请日:1978-05-26

    Abstract: The invention comprises a multi-vessel reaction apparatus useful for reacting phosphate rock and sulfuric acid in which the reaction slurry undergoes intra- and inter- vessel circulation (preferably through a draft tube). The solution portion of the slurry in a first vessel or set of vessels (the "dissolver") is preferably maintained at at lower sulfate ion concentration and the solution portion of the slurry in the second vessel or system of vessels (the "crystallizer") is preferably maintained at a positive sulfate ion concentration. Also preferred are means for maintaining the second vessel or set of vessels at a reduced pressure. Most preferred is that means be included in at least one said vessel for incorporating a crystal modifier (e.g. a sulfonic acid, a sulfonic acid salt, tall oil fatty acids or alkoxylated or esterified tall oil fatty acids) in the crystallizer. The system can be used in the anhydrite, hemihydrate or gypsum types of processes.

    Abstract translation: 本发明包括用于使磷酸盐岩和硫酸反应的多容器反应装置,其中反应浆料经受血管内和血管间循环(优选通过引流管)。 第一容器或一组容器(“溶解器”)中的浆液的溶液部分优选保持在较低的硫酸根离子浓度,并且浆液在第二容器或容器系统(“结晶器”)中的溶液部分 优选维持在正硫酸根离子浓度。 还优选的是用于在减压下维持第二容器或容器组的装置。 最优选的是,该方法包括在至少一个所述容器中,用于在结晶器中引入结晶改性剂(例如磺酸,磺酸盐,妥尔油脂肪酸或烷氧基化或酯化的妥尔油脂肪酸)。 该系统可用于无水石膏,半水合物或石膏类型的工艺。

    System for phosphoric acid production with decreased foaming
    7.
    发明授权
    System for phosphoric acid production with decreased foaming 失效
    磷酸生产系统,起泡减少

    公开(公告)号:US4258008A

    公开(公告)日:1981-03-24

    申请号:US866989

    申请日:1978-01-05

    Abstract: A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, includes in combination a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, a second reaction vessel containing a second slurry comprising calcium sulfate hemihydrate, circulation means including a draft tube disposed centrally in each of said vessels and an agitator positioned axially in each of said vessels within said draft tube, a first conduit interconnecting said first and second reaction vessels for conducting said first slurry from said first reaction vessel to said second reaction vessel, a second conduit interconnecting said vessels for conducting said second slurry from said second reaction vessel to said first reaction vessel, an inlet pipe for introducing phosphate rock and phosphoric acid to said first reaction vessel, said inlet pipe connected with the interior of said draft tube in said first vessel and wherein a vent is connected to said inlet pipe to permit escape of gases and, thus, increasing the rate of flow of said phosphate rock and phosphoric acid to said first reaction vessel.

    Abstract translation: 用于从磷酸盐岩和硫酸制备磷酸的系统包括组合含有包含硫酸钙半水合物,磷酸一钙和磷酸的第一浆料的第一反应容器,含有包含硫酸钙半水合物的第二浆料的第二反应容器, 循环装置,包括设置在每个所述容器中心的引流管和在所述引流管内的每个所述容器中轴向定位的搅拌器,将所述第一和第二反应容器互连的第一管道,用于将所述第一浆料从所述第一反应容器导入所述第一反应容器, 第二反应容器,将所述容器相互连接的第二管道,用于将所述第二浆料从所述第二反应容器引导到所述第一反应容器,用于将磷酸盐岩和磷酸引入所述第一反应容器的入口管,所述入口管与 所述导管在所述第一容器中,w 这里,排气口连接到所述入口管,以允许气体逸出,因此提高所述磷酸盐岩和磷酸流向所述第一反应容器的速率。

    Phosphoric acid process with high circulation rates
    9.
    发明授权
    Phosphoric acid process with high circulation rates 失效
    磷酸工艺具有高循环率

    公开(公告)号:US4277448A

    公开(公告)日:1981-07-07

    申请号:US909899

    申请日:1978-05-26

    CPC classification number: B01J16/00 C01B25/223 C01B25/225

    Abstract: Phosphoric acid is prepared from phosphate rock and sulfuric acid by using a reaction train comprising a dissolving slurry and a crystallization slurry maintained at different sulfate levels. Both inter and intra vessel circulation are used at high rates to minimize reagent concentration gradients and temperature gradients and provide a suitable crystallization environment. Preferably, the intra vessel circulation is substantially in plug flow, as through a draft tube.

    Abstract translation: 通过使用包含溶解浆料和维持在不同硫酸盐水平的结晶浆料的反应系,由磷酸盐岩和硫酸制备磷酸。 以高速率使用血管内和血管内循环以最小化试剂浓度梯度和温度梯度,并提供合适的结晶环境。 优选地,血管内循环基本上是流动的,如通过引流管。

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