KR860000177B1 - A process and its composition for condensated phosphate salts - Google Patents

Abstract

This condensed phosphate has a high chelation value, which bloks metal ions and maintains a low pH, and its physical properties are uniform throughout. The compsn. comprises sodium phosphate(60-75%), calcium phosphate(10-30%), photassium phosphate (10-30%) and a magnesium compd.(1-5%). A phosphoric acid soln., in which the mol ratio of M2O/P2O5 (M is an alkali metal.) was 1-1.5, was added to the phosphate compds., and then the mixture was melted. The molten mixture was passed through a pair of rollers and made into a sheet and was then cooled. The sheet of condensed phosphate was crushed into a powder.

Description

Condensed Phosphate Compositions and Methods for Making the Same

The present invention relates to a condensed phosphate composition used in food additives, pH stabilizers, antioxidants and the like and a method for producing the same.

Condensed phosphate in the present invention refers to a combination or complex in which two or more phosphates of sodium, potassium, calcium and magnesium are combined. Such condensed phosphates are widely used in food additives, pH stabilizers, dye stabilizers, antioxidants, anti-scaling agents and the like which improve the tenacity of starch foods.

In order to use the condensed phosphate as the above-mentioned food additive or chemical agent, the pH should be low and the CV value should be high, and the purity expressed by P ₂ O ₅ should be within a certain level. In fact, it is difficult to obtain condensed phosphates that satisfy these conditions.

That is, in the phosphate salt of metal ions, sodium ultraphosphate or sodium ultramethphosphate when the molar ratio of Na ₂ O / P ₂ O ₅ is less than 1, and sodium metaphosphate when the molar ratio of Na ₂ O / P ₂ O ₅ is 1 Or sodium hexametaphosphate.

Therefore, when defining the content of sodium phosphate or potassium in the food additive standard, sodium metaphosphate and potassium are defined as 65-83% and 56-80%, respectively, based on P ₂ O ₅ , and sodium polyphosphate and potassium are defined as P _2. 53-80% and 43-76% based on O ₅ is regulated to a wide range. However, even when the phosphate is manufactured to fall within the scope of the above-mentioned regulations, the C. V and metal ion blocking ability, which greatly affects the properties of phosphate, especially condensate phosphate, has a low effect, thus improving C. V and metal ion blocking power. It is becoming important to stabilize the pH to a low range.

According to the research results of the present inventors, it is difficult to obtain a product having a high CV and metal ion blocking ability only with a single component phosphate, and a high CV and a high metal ion blocking power in a condensed phosphate prepared by mixing and melting a specific component of phosphate I found out that I can get the product.

However, when the condensed phosphate prepared by combining phosphates of certain components was prepared by the conventional method, the physical properties such as CV and metal ion sequestering power did not appear uniformly throughout the product, but many precipitates appeared in the dissolved state and the solubility was extremely poor. . These results indicate that when the raw materials are mixed, melted, and cooled to obtain condensate phosphate, the melt is received in a conventional container and cooled, and thus, the difference between the first melt and the subsequent melt is different. Then the physical properties are not uniform.

An object of the present invention is to improve the physical properties of the above-mentioned condensate phosphate to provide a condensate phosphate composition having a high CV and metal ion blocking power while maintaining a low pH and uniform properties throughout, and a method for producing the same .

In order to achieve the above object of the present invention, the present invention is formulated with sodium phosphate 60-75%, calcium phosphate 10-30%, potassium phosphate 10-30% and magnesium compound 1-5% and M ₂ O / P ₂ O Phosphoric acid is blended so that the molar ratio of ₅ (M represents an alkali metal) is in the range of 1-1.5, followed by heat melting at 900 ° C to 1200 ° C.

It is preferable to use magnesium chloride or magnesium oxide as the magnesium compound used in the present invention.

Referring to the method of the present invention for producing a condensed phosphate from the above-described raw material composition is as follows.

Sodium phosphate is prepared as an anhydride and mixed with liquid phosphoric acid so that the phosphoric acid is absorbed into the phosphate, and then mixed with calcium phosphate, potassium phosphate and magnesium and put into a heating reaction furnace.

The combination of phosphate to phosphate may absorb the phosphoric acid in one component of the phosphate and then combine it with the other components or absorb the phosphoric acid in the formulation of the entire phosphate component. The blending amount of phosphoric acid is M ₂ O / P ₂ O Mix so that the molar ratio of ₅ is adjusted in the range of 1-1.5. In addition, when phosphate is mixed with phosphate, the phosphate may be penetrated and absorbed by phosphate by spraying phosphate with phosphoric acid, or by mixing and mixing phosphoric acid and phosphate, and then allowing it to stand for a certain time.

In this way, absorbing phosphoric acid into sodium phosphate anhydride and then introducing it into the reaction furnace can reduce the corrosion of the reaction furnace and extend the life of the reaction furnace, as compared with the case where sodium phosphate is added into the reaction furnace as a solution. It is possible to prevent foreign matters from the corrosion of the reaction material to be mixed in the reactants, and the condensation reaction occurs at a constant temperature due to the small temperature change caused by the addition of the reactant solution. In the case of using the phosphate crystals, the molar ratio of M ₂ ⁰ / P ₂ ⁰ ₅ is less than 1, so the physical properties are greatly changed. Therefore, the required product cannot be obtained. In the molar ratio of M ₂ O / P ₂ O _{5 It} can be adjusted to greater than 1 to obtain a product having the required physical properties.

The raw material blend added to the reaction furnace is melted at 900 ° C.-1,200 ° C. and then cooled while rolling the melt through two horizontally placed rollers while discharging the melt from the reaction furnace while rolling the sheet into a roller.

Cooling of the melt can be cooled by circulating the coolant in the roller or by cooling the air in the roller. The specific cooling means is selected according to the surrounding environment such as a factory facility.

In this way, the cooling method of cooling while passing between rollers improves the CV value and improves the solubility as compared to the case of cooling by receiving a container such as a stainless steel bed. Cooling underneath has the advantage of exhibiting uniform physical properties throughout the entire product. Moreover, according to the conventional method, there is a problem that it is difficult to pulverize finely because it becomes a lump state after cooling, but there is also an advantage that it is easy to grind when made into a sheet like the present invention. In particular, the condensation phosphate prepared by the conventional method appears a lot of precipitate in the dissolved state and poor solubility, but the condensation phosphate prepared by the method of the present invention is good solubility and no precipitate was formed.

The condensed phosphate according to the method of the present invention described above has a molar ratio of M ₂ O / P ₂ O ₅ in the range of 1-1.5, but the same M ₂ O / P due to the synergy between the raw materials and the difference in the preparation method thereof. Compared to other condensate phosphates prepared by the conventional method with a molar ratio of ₂ O ₅ , it can be seen that C. V is significantly higher and that metal ion sequestration is also markedly higher as shown in the following comparison table.

The condensed phosphate according to the present invention can be usefully used in various applications such as food additives, anti-scale agents, antioxidants, pH buffers, reducing agents, etc., by the high CV and metal ion containment and stable pH. have.

[table]

EXAMPLE

Sodium phosphate 70%, calcium phosphate 13%, potassium phosphate 15% and magnesium chloride 2% are combined and the phosphate solution is sprayed to make the molar ratio of M ₂ O / P ₂ O ₅ 1.0 so that the phosphate solution is penetrated and absorbed in the phosphate. The solution is then poured into a reactor and heated to 900 ° C. to melt.

The hot melt condensed phosphate melt is laid horizontally and passed between two rollers in which the coolant flows inward to form a sheet, which is cooled while the fully cooled condensed phosphate sheet is ground to powder.

Claims (4)

Sodium phosphate 60-75%, potassium phosphate 10-30%, calcium phosphate 10-30% and magnesium compound 1-5% are combined and the molar ratio of M ₂ O / P ₂ O ₅ (M is alkali metal) is 1- A condensed phosphate composition obtained by blending a phosphate solution with a phosphate compound to a ratio of 1.5 and melting. In the method of producing condensed phosphate by melting and cooling phosphate, a raw material composed of magnesium compound such as sodium phosphate, potassium phosphate, calcium phosphate, magnesium chloride or magnesium oxide is made to have M ₂ O / P ₂ O ₅ of 1-1.5. And melting the mixture by heating it to 900 ° C.-1,200 ° C., and then cooling the melt by passing it between two horizontally placed rollers to form a sheet. According to claim 2, the compounding ratio of raw materials is sodium phosphate 60-75%, potassium phosphate 10-30%, calcium phosphate 10-30%, magnesium compound 1-5% and phosphoric acid M ₂ O / P ₂ O ₅ is 1 Characterized in that the formulation is in the range -1.5. (delete)