Production method of sodium citrate
A technology of sodium citrate and production method, which is applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate, calcium carbonate/strontium/barium, etc. Sodium products are unqualified, calcium sulfate cannot be further processed, etc., to avoid excessive calcium ions, avoid influence, and large crystal particles
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Embodiment 1
[0036] A kind of production method of sodium citrate, its concrete steps are:
[0037] (1) Add calcium citrate slurry to the citric acid fermentation filtrate, stir and react at 60°C for 1.5 hours, wherein the molar ratio of citric acid in the citric acid fermentation filtrate to citrate in the calcium citrate slurry is 1:0.25;
[0038] (2) Add the slurry obtained in step (1) and the limestone powder slurry into the reactor at the same time to ensure that the molar ratio of citric acid molecules to calcium ions in the entire system is 1:0.65, complete rapid stirring and filtration within 15 minutes, and use a mass fraction of 25% ionic membrane caustic soda absorbs the carbon dioxide released by the reaction to prepare sodium carbonate solution; wherein, the mass content of calcium carbonate in the limestone powder is 91%, and the particle size is less than 100 mesh; the solid mass content in the limestone powder slurry is 50%;
[0039] (3) Add the refluxing calcium hydrogen c...
Embodiment 2
[0045] A kind of production method of sodium citrate, its concrete steps are:
[0046] (1) Add calcium citrate slurry to the citric acid fermentation filtrate, stir and react at 70°C for 2 hours, wherein the molar ratio of citric acid in the citric acid fermentation filtrate to citrate in the calcium citrate slurry is 1:0.1;
[0047] (2) Add the slurry obtained in step (1) and the limestone powder slurry into the reactor at the same time to ensure that the molar ratio of citric acid molecules to calcium ions in the entire system is 1:0.70, and complete rapid stirring and filtration within 30 minutes; among them, limestone powder The mass content of calcium carbonate in the medium is 92%, and the particle size is less than 100 mesh; the solid mass content in the limestone powder slurry is 52%;
[0048] (3) Add the refluxing calcium hydrogen citrate slurry to the filtered supernatant for primary crystallization; the volume ratio of the filtered supernatant to the refluxing calci...
Embodiment 3
[0054] A kind of production method of sodium citrate, its concrete steps are:
[0055] (1) Add calcium citrate slurry to the citric acid fermentation filtrate, stir and react at 80°C for 3 hours, wherein the molar ratio of citric acid in the citric acid fermentation filtrate to citrate in the calcium citrate slurry is 1:0.17;
[0056] (2) Add the slurry obtained in step (1) and the limestone powder slurry into the reactor at the same time to ensure that the molar ratio of citric acid molecules to calcium ions in the entire system is 1:0.75, complete rapid stirring and filtration within 45 minutes, and use a mass fraction of The 18% ionic membrane caustic soda solution absorbs the carbon dioxide emitted by the reaction to prepare a sodium carbonate solution; wherein, the mass content of calcium carbonate in the limestone powder is 95%, and the particle size is less than 100 mesh; the solid mass content in the limestone powder slurry is 55%;
[0057] (3) Add the refluxing calciu...
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