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Method for preparing food-grade disodium hydrogen phosphate

A food-grade disodium hydrogen phosphate dodecahydrate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as low yield, complicated preparation process, and influence on wide use, and achieve high reaction yield Improved effect

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

However, the preparation process of the existing food-grade disodium hydrogen phosphate dodecahydrate is complicated, and the yield is low, which affects the wide use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of food grade disodium hydrogen phosphate dodecahydrate, the preparation steps are:

[0017] (1) Dissolving material: Dissolve 500 grams of sodium hydroxide into 1000 milliliters of deionized water under stirring, and let stand overnight. The next day the solution was filtered for use;

[0018] (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, and the temperature of the system will be kept below 70 degrees Celsius by controlling the addition speed of the lye, and the pH value of the system will be continuously tested. When the pH value of the system is 9, stop feeding, keep the temperature of...

Embodiment 2

[0021] A preparation method of food grade disodium hydrogen phosphate dodecahydrate, the preparation steps are:

[0022] (1) Dissolving material: Dissolve 500 grams of sodium hydroxide into 1000 milliliters of deionized water under stirring, and let stand overnight. The next day the solution was filtered for use;

[0023] (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, and the temperature of the system can be kept below 70 degrees Celsius by controlling the addition speed of the lye, and the pH of the system is constantly tested. value; when the pH value of the system was 9.2, stop feeding, keep the system tempera...

Embodiment 3

[0026] A preparation method of food grade disodium hydrogen phosphate dodecahydrate, the preparation steps are:

[0027] (1) Dissolving material: Dissolve 500 grams of sodium hydroxide into 1000 milliliters of deionized water under stirring, and let stand overnight. The next day the solution was filtered for use;

[0028] (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, and the temperature of the system can be kept below 70 degrees Celsius by controlling the addition rate of the lye, and the pH value of the system is constantly tested ; When the pH value of the system was 9.5, stop feeding, keep the system temperature,...

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PUM

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Abstract

The invention relates to a method for preparing food-grade disodium hydrogen phosphate. The method comprises the following steps of: (1) dissolving sodium hydroxide into deionized water with stirring and filtering the solution for later use; (2) putting deionized water, a phosphoric acid and activated carbon serving as a discoloring agent into a reactor in turn, slowly adding the solution prepared in the step (1) into the reactor, stopping adding materials when a pH value of the system is between 9 and 9.5, maintaining the temperature of the system, and continuously stirring the system for 40 to 60 minutes; and (3) standing the reaction solution for one night, adding the reaction solution into a concentration kettle, heating the reaction solution to boiling, naturally cooling the reaction solution with stirring till crystals in the solution are fully precipitated out, filtering and separating the crystals out of crystal mother solution, and naturally drying the obtained clear crystals in the shade to obtain the food-grade disodium hydrogen phosphate which can be packaged and sold in markets. Through the comparative study on the process of synthesizing the food-grade disodium hydrogen phosphate, the optimum reaction mixture ratio of a phosphoric acid reactant to a sodium hydroxide reactant is determined, so the reaction yield is improved, and the method is more suitable for the requirements of 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 disodium hydrogen phosphate dodecahydrate. Background technique [0002] Food-grade disodium hydrogen phosphate dodecahydrate is a colorless monoclinic crystal or white powder, used to make baking powder, and used as a quality improver, emulsifier, nutritional enhancer, and fermentation aid in food processing , binder; used as a quality improver in the food industry; used as a culture agent for the production of baking powder, penicillin, and lianmycin; used as baked products in food to prevent oxidation and discoloration, as an emulsifier for dairy products to prevent protein coagulation, and for solid drinks to chelate Combined, emulsifying and buffering effects, etc. However, the preparation process of the existing food-grade disodium hydrogen phosphate dodecahydrate is complicated, and the yield is low, which affects the wide use...

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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