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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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  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 the present invention, problems such as high easy char value and unstable quality of existing sodium citrate finished products are effectively solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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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.

Description

technical field [0001] The invention relates to a method for removing easily charred substances of sodium citrate. Background technique [0002] Sodium citrate, also known as sodium citrate, scientific name 2-hydroxypropane-1,2,3-tricarboxylate sodium dihydrate, molecular formula C 6 h 5 Na 3 o 7 2H 2 O, is a white or colorless organic compound crystal. [0003] As an additive, sodium citrate has been widely used in food, beverage, medicine and other industries. Among them, as a food additive, it is mainly used as a flavoring agent, buffer, emulsifier and stabilizer, etc.; in medicine, sodium citrate is an important blood anticoagulant, and sodium citrate is added to expectorants and diuretics at the same time. It can correct the acidity of blood, body fluids and urine. With the development of the economy, the social demand for sodium citrate has increased rapidly. At the same time, due to the improvement of people's attention to food safety, the quality problems that...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/41C07C51/42
CPCC07C51/412C07C51/42C07C59/265
Inventor 寇光智李昌涛袁琪琛安丰民周一江张玲玲
Owner RIZHAO JINHE BOYUAN BIOCHEM
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