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Purification of Dihydric Phosphate

Author: HuangZuo
Tutor: WangLi
School: Central China Normal University
Course: Inorganic Chemistry
Keywords: Ammonium dihydrogen phosphate Potassium dihydrogen phosphate Chelating resin Ion exchange chromatography
CLC: TQ126.3
Type: Master's thesis
Year: 2009
Downloads: 59
Quote: 0
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Abstract


The purity of the total content of transition metal impurities below 5ppm metaphosphates because it has a unique optical properties, as one of the main raw material of the laser glass, while such a high purity metaphosphate has also been widely applied to the military industry . Al (PO 3 ) 3 and KPO 3 is the main raw material for preparing a phosphate optical glass, can be of a high purity Al (OH) < sub> 3 and the NH 4 H 2 PO 4 or KH 2 PO 4 reaction. This thesis using ion exchange resin purification the analytically pure NH 4 H 2 PO 4 and industrial-grade KH 2 PO 4 , the impurity transition metal ions (Fe 3 , Co 2 , Ni 2 , Cu 2 , Cr 3 , Mn 2 ) the total content below 5ppm high purity NH 4 H I PO 4 and the KH 2 PO 4 , as further preparation of high purity Al (PO 3 ) 3 the KPO 3 to provide raw materials, on the application of such methods in industrial preliminary discussion. This dissertation includes the following: First, the use of ion-exchange chromatography for purification, the choice has strong adsorption transition metal ion capacity of D751 resin, using the resin purification NH 4 H 2 < / sub> PO 4 after each impurity to the total content of a transition metal ion to 5ppm or less of high-purity NH 4 H 2 Po 4 . Tested resin static adsorption capacity and regeneration performance. Second, the use of the three resins contrast, the selective adsorption of transition metal ions without adsorption alkaline earth metal, are D001, 732 and 742 of the resin, purified, D001, 732 and 742 resin the NH 4 H 2 PO 4 of each impurity transition metal ions have a certain adsorption capacity, but the impurity content of the transition metal ions is about in 12ppm 5ppm or less, can not achieve the requirements. Test the the three resins static saturated adsorption capacity and regeneration performance. Third, using the purified D751 chelate resin KH 2 PO 4 , and a total content of transition metal ions of the respective impurity is obtained after purification in the purity KH below 5ppm 2 < / sub> PO 4 . Tested resin static adsorption capacity and regeneration performance. Fourth, the purity of high purity vinylidene aluminum phosphate detected by many methods of measuring the content of phosphorus and aluminum in the product, to give better phosphomolybdate quinoline assay by weight of phosphorus and the complexometric titration detecting the content of aluminum, accurate high. Determination of high-purity the partial aluminum phosphate product purity above 95%.

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CLC: > Industrial Technology > Chemical Industry > Non-metallic elements and their inorganic compounds, the chemical industry > Section Ⅴ family of non-metallic element and its inorganic compounds > Phosphorus and its inorganic compounds
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