Preparation method of anhydrous trisodium phosphate
A technology of hydrated trisodium phosphate and trisodium phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of manual crushing, high energy consumption, and easy agglomeration, and achieve improved purity and particle distribution Uniform, non-caking effect
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Embodiment 1
[0025] The invention discloses a preparation method of anhydrous trisodium phosphate, comprising the following steps:
[0026] (1) Add 40% sodium hydroxide solution in the reactor, add dropwise 30% phosphoric acid solution in the stirring process, wherein the mol ratio of sodium hydroxide and phosphoric acid is 5:1, the pH of monitoring reaction solution in the dropwise addition process is 10. After the dropwise addition, raise the temperature to 50°C, react for 4 hours, and measure the molar ratio of sodium and phosphorus in the neutralization solution to be 2.99; cool down to 10°C, stir and crystallize for 4 hours, and filter with a centrifuge to obtain a solid of trisodium phosphate dodecahydrate;
[0027] (2) Add ethanol to the reaction kettle, add trisodium phosphate dodecahydrate solid during the stirring process, set the temperature at 30°C, and crystallize for 3 hours; shake off and filter with a centrifuge to obtain a filter cake;
[0028] (3) Put the filter cake into...
Embodiment 2
[0030] The invention discloses a preparation method of anhydrous trisodium phosphate, comprising the following steps:
[0031] (1) Add 50% sodium hydroxide solution in the reaction kettle, add dropwise 25% phosphoric acid solution during stirring, wherein the mol ratio of sodium hydroxide and phosphoric acid is 3:1, monitor the pH of the reaction solution during the dropwise addition process to be 11 After the dropwise addition, the temperature was raised to 70°C, reacted for 3 hours, and the molar ratio of sodium to phosphorus in the neutralization solution was 3.0; cooled to 20°C, stirred and crystallized for 4 hours, and filtered by a centrifuge to obtain a solid of trisodium phosphate dodecahydrate;
[0032] (2) Add 100 ml of cyclohexane into the reaction kettle, add 0.1 mol of trisodium phosphate dodecahydrate solid during stirring, raise the temperature to 80°C, and continue heating for 10 minutes. After cooling, filter with a centrifuge to obtain a filter cake;
[0033...
Embodiment 3
[0035] The invention discloses a preparation method of anhydrous trisodium phosphate, comprising the following steps:
[0036] (1) Add 45% sodium hydroxide solution in the reaction kettle, add dropwise 25% phosphoric acid solution in the stirring process, wherein the mol ratio of sodium hydroxide and phosphoric acid is 4:1, monitor the pH of the reaction solution during the dropwise addition process to be 11 , the dropwise addition was completed, the temperature was raised to 60°C, and the reaction was carried out for 3.5 hours. The molar ratio of sodium to phosphorus in the neutralizing liquid was 3.01; the temperature was cooled to 15°C, stirred and crystallized for 4.5 hours, and filtered by a centrifuge to obtain a solid of trisodium phosphate dodecahydrate;
[0037] (2) Add ethanol to the reaction kettle, add trisodium phosphate dodecahydrate solid during the stirring process, set the temperature at 45°C, and conduct crystallization for 2.5 hours; filter with a centrifuge ...
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