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Method for preparing food-grade anhydrous disodium hydrogen phosphate

Anhydrous disodium hydrogen phosphate, food-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of low yield, complex process of food-grade anhydrous Disodium hydrogen phosphate water is widely used to achieve the effect of improving the reaction yield

Inactive Publication Date: 2010-11-24
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the food-grade anhydrous disodium hydrogen phosphate prepared by the existing process is relatively complicated, and the more important thing is that the yield is low, which affects the wide use of food-grade anhydrous disodium hydrogen phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of food grade anhydrous disodium hydrogen phosphate, the preparation steps are:

[0019] (1) dissolving material: the sodium hydroxide of 500 grams is dissolved in 1000 milliliters of deionized waters under agitation, stand overnight, this solution is filtered for subsequent use the next day;

[0020] (2) Reaction: In a 5000 ml reactor with a heating device, electric stirring, thermometer, and water circulation condenser, 1000 ml of deionized water, 700 grams of phosphoric acid and activated carbon as a decolorizing agent were successively dropped into, and then slowly added The solution prepared in step (1); when the lye is added to the acid solution, the temperature of the system will automatically rise. At this time, the temperature of the system can be kept below 70 degrees Celsius by controlling the addition speed of the lye, and the system is constantly tested When the pH value of the system is 9, stop feeding, keep the system temperature, and...

Embodiment 2

[0024] (1) dissolving material: the sodium hydroxide of 500 grams is dissolved in 1000 milliliters of deionized waters under agitation, stand overnight, this solution is filtered for subsequent use the next day;

[0025] (2) Reaction: In a 5000 ml reactor with a heating device, electric stirring, thermometer, and water circulation condenser, 1000 ml of deionized water, 700 grams of phosphoric acid and activated carbon as a decolorizing agent were successively dropped into, and then slowly added For the solution prepared in step (1), when the lye is added to the acid solution, the temperature of the system will automatically rise. At this time, the temperature of the system can be kept below 70 degrees Celsius by controlling the addition rate of the lye, and the system is continuously tested. When the pH value of the system is 9.2, stop feeding, keep the temperature of the system, and continue to stir for 40-60 minutes;

[0026] (3) Concentration: leave the reaction solution ov...

Embodiment 3

[0029] (1) dissolving material: the sodium hydroxide of 500 grams is dissolved in 1000 milliliters of deionized waters under agitation, stand overnight, this solution is filtered for subsequent use the next day;

[0030] (2) Reaction: In a 5000 ml reactor with a heating device, electric stirring, thermometer, and water circulation condenser, 1000 ml of deionized water, 700 grams of phosphoric acid and activated carbon as a decolorizing agent were successively dropped into, and then slowly added For the solution prepared in step (1), when the lye is added to the acid solution, the temperature of the system will automatically rise. At this time, the temperature of the system can be kept below 70 degrees Celsius by controlling the addition rate of the lye, and the system is continuously tested. When the pH value of the system is 9.5, stop feeding, keep the temperature of the system, and continue to stir for 40-60 minutes;

[0031] (3) Concentration: leave the reaction solution ov...

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Abstract

The invention relates to a method for preparing food-grade anhydrous disodium hydrogen phosphate. The method comprises the following steps of: (1) dissolving sodium hydroxide in deionized water with stirring and filtering for later use; (2) sequentially adding the deionized water, phosphoric acid and active carbon serving as a decoloring agent into a reactor, and then slowly adding the solution obtained by the step (1); when the pH value of the system is between 9 to 9.5, stopping adding materials, keeping the temperature of the system and continuing to stir for 40 to 60 minutes; (3) adding the reaction liquid into a concentration kettle, heating the reaction liquid with uniformly stirring until the reaction liquid is boiled, naturally cooling the reaction liquid with stirring until a crystal is completely separated out of the solution, and naturally drying the obtained clear crystal in the shade for later use; and (4) putting the crystal in an electrically heated drier for drying until moisture of the crystal is not separated out of the drier and packaging the crystal for sale. The optimal reaction proportion of various reactants including the phosphoric acid and the sodium hydroxide is determined through comparison research on the synthesis process of the food-grade anhydrous disodium hydrogen phosphate, so the method improves the reaction yield and is more suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of organic compound preparation, in particular to a preparation method of food-grade anhydrous disodium hydrogen phosphate. Background technique [0002] Food grade anhydrous disodium hydrogen phosphate is a white powder, used as water softener, fabric weighting agent, fireproof agent, and used in glaze, solder, medicine, pigment, food industry and other phosphates, and can be Prepare pH buffering agent; it can also be used as a raw material to produce various foods and medicines supplemented with phosphorus. It is used as quality improver, emulsifier, nutrition enhancer, fermentation aid and binder in food processing. [0003] However, the food-grade anhydrous disodium hydrogen phosphate prepared by the existing process is relatively complicated, and the more important thing is that the yield is low, which affects the wide use of food-grade anhydrous disodium hydrogen phosphate. Contents of the invention [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
Inventor 徐博刚
Owner TIANJIN CHEM REAGENT RES INST
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