Method for producing trisodium monohydrogen diphosphate by neutralization process

A technology of monohydrogen trisodium pyrophosphate and phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of no production process and application research, and achieve convenient process, strong operability and high purity Effect

Active Publication Date: 2014-11-05
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Trisodium monohydrogen pyrophosphate is a new additive that can be used in food. At present, there are no reports on its production process and application research in China.

Method used

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  • Method for producing trisodium monohydrogen diphosphate by neutralization process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0008] Example 1: A certain amount of phosphoric acid is added in the neutralization pot, and the ion-exchange membrane caustic soda is continuously added to Na: P is 1.50-1.51, the slurry concentration is controlled at 30-60%, the reaction temperature is 80-120 ° C, and it is incubated for 0.5-1h. The solution obtained by the reaction is spray-dried at 140-180° C., and the dried powder is sent to a polymerization furnace for polymerization. The polymerization temperature is controlled at 170-250° C., and reacted for 2 hours to obtain trisodium monohydrogen pyrophosphate.

[0009] The whole reaction process equation is:

[0010] 3NaOH+2H 3 PO 4 →Na 2 HPO 4 +NaH 2 PO 4 +3H 2 o

[0011] Na 2 HPO 4 +NaH 2 PO 4 →Na 3 HP 2 o 7 +H 2 o

example 2

[0012] Example 2: First add water to the neutralization pot, add a certain amount of soda ash, stir and dissolve completely, heat the solution with steam, and heat the solution to 80-120°C, add food phosphoric acid, control Na:P to 1.50-1.51, and control the slurry concentration At 30-60%, keep warm for 0.5-1h. The solution is spray-dried at 140-180°C, and the dried powder is sent to a polymerization furnace for polymerization. The polymerization temperature is controlled at 170-250°C, and the reaction is carried out for 2 hours to obtain the trisodium monohydrogen pyrophosphate product.

[0013] The whole reaction process equation is:

[0014] 3Na 2 CO 3 +4H 3 PO 4 →2Na 2 HPO 4 +2NaH 2 PO 4 +3H 2 O+3CO2

[0015] Na 2 HPO 4 +NaH 2 PO 4 →Na 3 HP 2 o 7 +H 2 o

[0016] Example 1 and example 2 gained product test results are as follows:

[0017]

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Abstract

The invention provides a method for producing trisodium monohydrogen diphosphate by a neutralization process. The method comprises the following steps of performing neutralization reaction on phosphoric acid and alkali which serve as raw materials, spray drying a neutralized solution at the temperature of between 140 and 180 DEG C, conveying the powder obtained by the spray drying step to a polymerization furnace at the temperature of between 170 and 250 DEG C and performing polymerization to obtain trisodium monohydrogen diphosphate. The alkali used in the method is ion film caustic soda or sodium carbonate, and the ratio of Na to P is 1.50 to 1.51. The invention provides the method for producing the trisodium monohydrogen diphosphate. The trisodium monohydrogen diphosphate is a new type of phosphate in China, and the method for producing the trisodium monohydrogen diphosphate is originated in China and fills in the blank in production of the trisodium monohydrogen diphosphate. Moreover, the trisodium monohydrogen diphosphate produced by the method solves the problems that sodium pyrophosphate has poor solubleness and high alkalinity in application and can replace the sodium pyrophosphate in a lot of application fields. The production method is high in operability, the flow is quite convenient for industrialization, and the products produced by the method are high in purity.

Description

technical field [0001] The invention relates to a method for producing monohydrogen trisodium pyrophosphate by reacting phosphoric acid and alkali as raw materials. Background technique [0002] Phosphates are widely used in food, and sodium pyrophosphate is widely used as a water-retaining agent in meat products and aquatic products; Sodium pyrophosphate has poor solubility, especially under low temperature conditions, and the dissolution rate is full, and it is easy to agglomerate in the solution, which is not convenient for the industrial processing of food. [0003] Trisodium monohydrogen pyrophosphate is a phosphate between sodium pyrophosphate and disodium dihydrogen pyrophosphate, with a pH value of 7.0±0.5 and good solubility. It can be avoided when used in combination with sodium pyrophosphate or alone. Disadvantages of sodium pyrophosphate in food processing. In addition, trisodium monohydrogen pyrophosphate can also be used as a flavor enhancer and food attracta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/42
Inventor 李国璋屈云张亚娟范佳利龚敏
Owner HUBEI XINGFA CHEM GRP CO LTD
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