The main function of sodium hexametaphosphate in food is to improve the color, aroma and taste of food, adjust the nutrient composition of food, and extend the shelf life of food. In order to use sodium hexametaphosphate correctly, the quality requirements for sodium hexametaphosphate must be limited according to different industries and application scenarios. Only in this way can sodium hexametaphosphate play its best role properly.
What role does sodium hexametaphosphate play in industry?
How to prepare sodium hexametaphosphate?
What to consider when using sodium hexametaphosphate?
What role does sodium hexametaphosphate play in industry?
(1) Sodium hexametaphosphate can be heated with sodium fluoride to produce sodium monofluorophosphate, which is an important industrial raw material;
(2) Sodium hexametaphosphate is used as water softener, when used in dyeing and finishing, it can soften water;
(3) Sodium hexametaphosphate is also widely used as a cauldron inhibitor in the water treatment industry such as EDI (resin electrodialysis), RO (reverse osmosis) and NF (nanofiltration).
How to prepare sodium hexametaphosphate?
1.The reagent sodium dihydrogen phosphate is heated to 250°C and quenched to obtain the dimer of sodium metaphosphate; heated to 650°C and quenched to obtain sodium hexametaphosphate.
2.Phosphoric acid anhydride process: After heating and melting yellow phosphorus is sent into an oxidative combustion furnace, and the oxygen in the dry air is used for the oxidative combustion reaction to produce an intermediate, phosphoric acid anhydride. After mixing phosphoric acid anhydride and soda, high temperature polymerization reaction, quenching the tablet to obtain flaky sodium hexametaphosphate; powdered sodium hexametaphosphate may be obtained after crushing.
3.Neutralization polymerization process: Pass phosphoric acid and liquid sodium hydroxide through their respective batch controls (control the input amount of liquid caustic soda and acid in each batch, can be automatically set batch by batch and the feed speed can be set arbitrarily in the range of 0~20L/min) it is continuously and accurately placed in the neutralization tank for the Neutralisation reaction given. After completion of the reaction, the pH value reaches 4 to 4.4 and disodium hydrogen phosphate is formed, which is pumped into the high tank via the neutralization fluid pump. A certain amount of disodium hydrogen phosphate is sent to the dryer continuously and evenly for drying to obtain flaky disodium hydrogen phosphate with a certain moisture content, and then continuously fed to the high temperature (750°C) of diesel combustion from special corrosion resistant material. 850℃) melt and polymerize disodium hydrogen phosphate in the polymerization furnace; the molten material flows continuously from the polymerization furnace and is quenched and pressed to obtain flaky sodium hexametaphosphate, which is crushed and sieved to obtain the product.
What to consider when using sodium hexametaphosphate?
It is widely known that sodium hexametaphosphate has excellent dispersing effect due to its special functional polyphosphoric acid group, and the application effect is very good in many industries. For example: washing industry, printing and dyeing industry, mineral processing industry, degreasing; Food water retention and so on.
In order to properly use sodium hexametaphosphate, some specific indicators for hexametaphosphate need to be defined by different industries. For example, some industries have different requirements for the chain length of their molecules; the printing and dyeing industry often has strict requirements for irrelevant impurities; The food additives industry must not contain excessive heavy metals and other harmful impurities.
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