Method for removing readily carbonizable substances out of sodium citrate
A technology for easy carbonization and sodium citrate, applied in the separation/purification of carboxylic acid compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high carbonization value and unstable quality of sodium citrate, and achieve The effect of stable crystal quality, reduction of easy carbon value, and good industrial application prospects
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Embodiment 1
[0025] A kind of removal method of sodium citrate easy charring, comprises the following steps:
[0026] (1) Warm up the citric acid mother liquor to 75°C to obtain solution I, the citric acid content in the citric acid mother liquor is 0.60g / mL, and the pH value is 1;
[0027] (2) Add concentrated sulfuric acid with a mass fraction of 94.5% to solution I while stirring, and react for 2 hours to obtain solution II. The mass ratio of solution I to concentrated sulfuric acid is 1:0.2;
[0028] (3) adding a calcium source to the solution II while stirring, adjusting the pH value to 3, and filtering to obtain a citric acid crude filtrate, the calcium source being tricalcium citrate;
[0029] (4) Heat the crude citric acid filtrate obtained in step (3) to 100°C, and then filter through a closed plate filter coated with diatomaceous earth and activated carbon to obtain fine citric acid filtrate with a filtration pressure of 0.04Mpa;
[0030] (5) adding mass fraction of 40% ionic me...
Embodiment 2
[0033] A kind of removal method of sodium citrate easy charring, comprises the following steps:
[0034] (1) Warm up the citric acid mother liquor to 80°C to obtain solution I, the citric acid content in the citric acid mother liquor is 0.30g / mL, and the pH value is 2;
[0035] (2) Add concentrated sulfuric acid with a mass fraction of 95.5% to solution I while stirring, and react for 1.5 hours to obtain solution II. The mass ratio of solution I to concentrated sulfuric acid is 1:0.4;
[0036] (3) adding a calcium source to the solution II while stirring, adjusting the pH value to 1, and filtering to obtain a citric acid crude filtrate, the calcium source being calcium hydrogen citrate;
[0037] (4) Heat the crude citric acid filtrate obtained in step (3) to 105°C, and then filter through a closed plate filter coated with diatomaceous earth and activated carbon to obtain fine citric acid filtrate with a filtration pressure of 0.03Mpa;
[0038] (5) adding 50% ion-exchange membra...
Embodiment 3
[0041] A kind of removal method of sodium citrate easy charring, comprises the following steps:
[0042] (1) Heat the citric acid mother liquor to 85°C to obtain solution I, the citric acid content in the citric acid mother liquor is 0.40g / mL, and the pH value is 3;
[0043] (2) Add concentrated sulfuric acid with a mass fraction of 95.0% to solution I while stirring, and react for 1 hour to obtain solution II. The mass ratio of solution I to concentrated sulfuric acid is 1:0.6;
[0044] (3) adding a calcium source to the solution II while stirring, adjusting the pH value to 2, and filtering to obtain a citric acid crude filtrate, the calcium source being calcium carbonate;
[0045] (4) Heat the crude citric acid filtrate obtained in step (3) to 110°C, and then filter through a closed plate filter coated with diatomaceous earth and activated carbon to obtain fine citric acid filtrate, with a filtration pressure of 0.035Mpa;
[0046] (5) adding mass fraction of 30% ionic membr...
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