公开(公告)号：US4759920A

公开(公告)日：1988-07-26

申请号：US872062

申请日：1986-06-06

Applicant: Alexander Iosef ,  Menachem Bar-On

Inventor： Alexander Iosef ,  Menachem Bar-On

IPC: C01B25/30 ,  C01B15/16 ,  C01B25/26

CPC classification number: C01B25/303

Abstract: The present invention relates to a process for the manufacture of disodium phosphate of a high purity without utilizing organic solvents. According to the process, monosodium sulfate is reacted, at a temperature, in the range of 40 to 100 degrees C. with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof, in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially complete eliminated with the solid gypsum or dicalcium phosphate resulted thereto. After separating said solid, the filtrate is treated in two neutralization stages: first by a calcium constituent selected from calcium carbonate, calcium hydroxide or mixtures thereof and separating the formed dicalcium phosphate, followed by a second neutralization with an alkali sodium constituent selected from sodium hydroxide, sodium carbonate and sodium bicarbonate or mixtures thereof at a pH in the range of 8.0 to 9.5. From the resulted filtrate, pure disodium phosphate is obtained by crystallization. The process is characterized by a high recovering of the P.sub.2 O.sub.5 and Na.sub.2 O values, the resulted product being substantially free of chloride ion.

公开(公告)号：US4678649A

公开(公告)日：1987-07-07

申请号：US872061

申请日：1986-06-06

Applicant: Iosef Alexander ,  Menachem Bar-on

Inventor： Iosef Alexander ,  Menachem Bar-on

IPC: C01B25/30 ,  C01B15/16 ,  C01B25/26

CPC classification number: C01B25/301 ,  C01B25/303

Abstract: The present invention relates to a process for the manufacture of monopotassium phosphate of a high purity without utilizing organic solvents. According to the process, monopotassium sulfate is reacted, at a temperature in the range of between 40 to 100 degrees with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially elininated, with the calcium sulfate resulted thereto. After separating out the calcium sulfate, the filtrate is neutralized to a pH in the range of between 3 to 7, with a calcium-containing compound comprising Ca(OH).sub.2, CaO or CaCO.sub.3, or mixtures thereof. From the filtrate obtained, pure monopotassium phosphate is crystallized out. The process is characterized by a high recovery of the P.sub.2 O.sub.5 and K.sub.2 O values, the monopotassium phosphate produced being completely free of chloride ion.

Abstract translation: 本发明涉及不使用有机溶剂制备高纯度磷酸二氢钾的方法。 根据该方法，在磷酸存在下，硫酸氢钾在40至100度的温度下与选自磷酸盐岩，磷酸二钙或其混合物的磷酸盐成分反应。 存在于起始磷酸盐岩中的普通金属杂质，有机物和氟化物基本上被酸化，产生硫酸钙。 在分离出硫酸钙之后，将滤液用包含Ca（OH）2，CaO或CaCO 3的含钙化合物或其混合物中和至3至7范围内的pH。 从得到的滤液中，将纯的磷酸二氢钾结晶出来。 该方法的特征在于P2O5和K2O值的高回收率，所产生的磷酸二氢钾完全不含氯离子。

公开(公告)号：US4585636A

公开(公告)日：1986-04-29

申请号：US661710

申请日：1984-10-17

Applicant: Alexander Iosef ,  Menachem Bar-on ,  Jacob Oren ,  Dagobert Kellerman

Inventor： Alexander Iosef ,  Menachem Bar-on ,  Jacob Oren ,  Dagobert Kellerman

IPC: C01B25/234 ,  C01B25/46 ,  C01B25/16

CPC classification number: C01B25/461 ,  C01B25/234 ,  C01B25/462

Abstract: The present invention relates to an improved process for the manufacture of purified phosphoric acid from phosphate rock. According to the invention, phosphate rock is decomposed by a mineral acid selected from hydrochloric acid, sulfuric acid or mixtures thereof. The dissolution liquor obtained is reacted with a calcium-containing compound such as calcium oxide, calcium carbonate, tricalcium phosphate and fines of phosphate rock producing an aqueous solution containing monocalcium phosphate in an amount corresponding to between 0.4% to 5.5% by wt CaO. After the separation of the precipitated solids, the clarified solution is extracted by an organic solvent having the property to extract the phosphate component. The phosphoric acid is subsequently recovered from the solvent extract by known methods such as washing or distillation.

Abstract translation: 本发明涉及从磷酸盐岩制造纯化磷酸的改进方法。 根据本发明，磷酸盐岩由选自盐酸，硫酸或其混合物的无机酸分解。 将得到的溶解液与含钙化合物如氧化钙，碳酸钙，磷酸三钙和磷酸盐岩的细粉反应，生成含有相当于0.4〜5.5重量％CaO的磷酸一钙的水溶液。 析出的固体分离后，通过具有提取磷酸盐成分性质的有机溶剂提取澄清溶液。 随后通过已知的方法例如洗涤或蒸馏从溶剂提取物中回收磷酸。