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- W2348652260 abstract "Using the industrial wet process phosphoric acid(WPA) and sodium hydroxide as raw materials,tributyl phosphate(TBP)+kerosene(diluent) as the extractant,a new process to prepare sodium dihydrogen phosphate was proposed by combining extraction,stripping and crystallization.Necessary experiments were carried out to determine appropriate extraction temperature,adding amount of diluent,back extraction condition and other factors to be applied in the whole process of industrial plant.Compared with the preparation method of sodium dihydrogen phosphate by thermal phosphoric acid,there is a significant difference in the crystallization process caused by difference in anion and cation mass fraction of extracted phosphoric acid.The effects of cooling rate,stirring rate,content(mass fraction) of part impurities,etc.on the crystallization process were mainly investigated to choose crystallization temperature.The relationship between SO2-4,F-,Fe3+ and the metastable zone width of sodium dihydrogen phosphate was determined,and the correlation equations were fitted.In the optimized conditions,the yield of phosphorus pentoxide loading in extraction phase is 95.0%,the sodium dihydrogen phosphate product purity(mass fraction) is over 99.3%,and Fe,As,Pb and other impurities have a higher removal rate after three-level extraction." @default.
- W2348652260 created "2016-06-24" @default.
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- W2348652260 date "2011-01-01" @default.
- W2348652260 modified "2023-09-26" @default.
- W2348652260 title "Preparation of sodium dihydrogen phosphate from wet process phosphoric acid and metastable characteristics of crystallization" @default.
- W2348652260 hasPublicationYear "2011" @default.
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