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

Active Publication Date: 2014-05-14

RIZHAO JINHE BOYUAN BIOCHEM

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AI-Extracted Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes a method for removing easily charred substances of sodium citrate. By adopting t...

Abstract

The invention relates to a method for removing readily carbonizable substances out of sodium citrate. The readily carbonizable substances in sodium citrate are removed by adding concentrated sulfuric acid and a calcium source into a citric acid mother liquid and by using treatment modes such as plate frame filtration, the method is effectively combined into a sodium citrate production process, the readily carbonization value of a sodium citrate finished product is greatly reduced, the prepared sodium citrate crystal is stable in quality and high in quality, and moreover the process is low in cost and has good industrial application prospect.

Application Domain

Organic compound preparationCarboxylic acid salt preparation +1

Technology Topic

ChemistryTrisodium citrate +6

Examples

Experimental program(5)

Example Embodiment

[0024] Example 1

[0025] A method for removing easily carbonized sodium citrate, including the following steps:

[0026] (1) The citric acid mother liquor is heated to 75°C to obtain solution I, the citric acid content in the citric acid mother liquor is 0.60 g/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) Add a calcium source to solution II while stirring, adjust the pH to 3, and filter to obtain a crude citric acid filtrate, wherein the calcium source is tricalcium citrate;

[0029] (4) The crude citric acid filtrate obtained in step (3) is heated to 100°C, and then filtered through a closed plate filter coated with diatomaceous earth and activated carbon to obtain a refined citric acid filtrate with a filtration pressure of 0.04Mpa;

[0030] (5) Add 40% mass fraction of ion-exchange membrane caustic soda to the fine citric acid filtrate obtained in step (4), and adjust the pH to 7.10;

[0031] (6) The solution obtained in step (5) is added to activated carbon at 95°C for decolorization, and then filtered through a plate filter and a ceramic membrane, concentrated, crystallized, centrifuged, and dried to obtain a sodium citrate product; tested that the carbon content is 40%.

Example Embodiment

[0032] Example 2

[0033] A method for removing easily carbonized sodium citrate, including the following steps:

[0034] (1) The citric acid mother liquor is heated 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 95.5% concentrated sulfuric acid 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) Add a calcium source to solution II while stirring, adjust the pH to 1, and filter to obtain a crude citric acid filtrate. The calcium source is calcium hydrogen citrate;

[0037] (4) The crude citric acid filtrate obtained in step (3) is heated to 105°C, and then filtered through a closed plate filter coated with diatomaceous earth and activated carbon to obtain refined citric acid filtrate with a filtration pressure of 0.03Mpa;

[0038] (5) Add 50% mass fraction of ion-exchange membrane caustic soda to the fine citric acid filtrate obtained in step (4), and adjust the pH to 7.10;

[0039] (6) The solution obtained in step (5) is added to activated carbon at 95°C for decolorization, and then filtered through a plate filter and a ceramic membrane, concentrated, crystallized, centrifuged, and dried to obtain a sodium citrate product; the tested carbon is 35%.

Example Embodiment

[0040] Example 3

[0041] A method for removing easily carbonized sodium citrate, including the following steps:

[0042] (1) The citric acid mother liquor is heated to 85°C to obtain solution I, the citric acid content in the citric acid mother liquor is 0.40 g/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) Add a calcium source to solution II while stirring, adjust the pH to 2, and filter to obtain a crude citric acid filtrate, wherein the calcium source is calcium carbonate;

[0045] (4) The crude citric acid filtrate obtained in step (3) is heated to 110°C, and then filtered through a closed plate filter coated with diatomaceous earth and activated carbon to obtain a refined citric acid filtrate with a filtration pressure of 0.035Mpa;

[0046] (5) Add 30% mass fraction of ion-exchange membrane caustic soda to the fine citric acid filtrate obtained in step (4), and adjust the pH to 7.20;

[0047] (6) Add activated carbon to the solution obtained in step (5) at 80°C and stir to decolorize, and then pass through a plate filter and ceramic membrane to filter, concentrate and crystallize, centrifuge, and dry to obtain the sodium citrate product; test its carbon content is 42%.

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Method for removing readily carbonizable substances out of sodium citrate

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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