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1. 发明授权

US4196172A Hemihydrate type phosphoric acid process 失效
标题翻译：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
申请人： Fernando N. Ore , John D. Ellis , James H. Moore
发明人： Fernando N. Ore , John D. Ellis , James H. Moore
IPC分类号： B01J19/00 , C01B25/22 , C01B25/226 , C01F11/46
CPC分类号： C01B25/2204 , B01J19/002 , C01B25/226 , C01F11/46
摘要： 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.
摘要翻译：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％）。

2. 发明授权

US4220630A Hemihydrate type process for phosphoric acid manufacture using additive to improve filterability 失效
标题翻译：使用添加剂的磷酸制造的半水合物型方法以改善过滤性
公开(公告)号：US4220630A
公开(公告)日：1980-09-02
申请号：US866963
申请日：1978-01-04
申请人： Fernando N. Ore'
发明人： Fernando N. Ore'
IPC分类号： C01B25/22 , C01B25/225 , C01B25/226 , C01F11/46
CPC分类号： C01B25/226 , C01B25/2204 , C01B25/225
摘要： When sulfate ions and a solution of monocalcium phosphate are reacted under conditions which result in the formation of a slurry comprising calcium sulfate hemihydrate and phosphoric acid of about 35% to about 55% P.sub.2 O.sub.5, filtration is improved when a sulfonic acid, a sulfonic acid salt, tall oil fatty acid or alkoxylated or esterified tall oil fatty acid and mixtures thereof is present in the slurry (preferably at 1-1000 ppm). Preferably 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, most preferably at a reduced pressure, (e.g. to provide evaporative cooling). Better filtration rates can thus be obtained due to the lower viscosity of the slurry and/or favorable shape, dominant size and size distribution of the hemihydrate crystals.
摘要翻译：当硫酸根离子和磷酸一氢钙的溶液在导致形成包含约35％至约55％的P 2 O 5的硫酸钙半水合物和磷酸的浆料的条件下反应时，当磺酸，磺酸盐，妥尔油脂肪酸或烷氧基化或酯化妥尔油脂肪酸及其混合物存在于浆料中（优选1-1000ppm）。优选地，使用二容器反应系统，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，最优选在减压下（例如提供蒸发冷却）。因此，由于浆料的粘度较低和/或有利的形状，半水合物晶体的主要尺寸和尺寸分布，因此可以获得更好的过滤速率。

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