Sodium Tripolyphosphate

Sodium Tripolyphosphate - Names and Identifiers

Name	Sodium Tripolyphosphate
Synonyms	poly STPP armofos empiphosstp-d freez-gardfp19 Sodium Tripolyphos Sodium triphosphate Pent-sodium Phosphate natriumtripolyphosphat SODIUM TRIPOLYPHOSPHATE Sodium Tripolyphosphate Sodium Phosphate Tripoly pentasodium triphosphate Pentasodium Tripolyphosphate Food Grade Sodium Tripolyphosphate Triphosphoric acid, pentasodium salt
CAS	7758-29-4
EINECS	231-838-7
InChI	InChI=1S/H5O10P3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h(H,7,8)(H2,1,2,3)(H2,4,5,6)/p-5
InChIKey	HWGNBUXHKFFFIH-UHFFFAOYSA-I

Sodium Tripolyphosphate - Physico-chemical Properties

Molecular Formula	Na5O10P3
Molar Mass	367.86
Density	2.52 g/cm3 (20℃)
Melting Point	622 °C
Water Solubility	20 g/100 mL (20 ºC)
Solubility	H2O: may be clear to slightly hazy
Vapor Presure	<0.1 hPa (20 °C)
Appearance	White or colorless crystals
Color	White
Odor	Odorless
Merck	14,8697
PH	9.0-10.0 (25℃, 1% in H2O)
Storage Condition	Storage temperature: no restrictions.
Stability	Stable. Incompatible with strong oxidizing agents, strong acids. Hygroscopic.
Sensitive	Hygroscopic
MDL	MFCD00003514
Physical and Chemical Properties	Character white powder. melting point 622 ℃ The solubility is easily soluble in water, and its aqueous solution is alkaline.
Use	Used in meat processing, synthetic detergent formula, textile dyeing, also used as dispersant, cosolvent, etc

Sodium Tripolyphosphate - Risk and Safety

Hazard Symbols	Xi - Irritant
Risk Codes	36/37/38 - Irritating to eyes, respiratory system and skin.
Safety Description	S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S24/25 - Avoid contact with skin and eyes.
WGK Germany	1
RTECS	YK4570000
FLUKA BRAND F CODES	3
TSCA	Yes
HS Code	28353110
Toxicity	LD50 orally in rats: 6.50 g/kg (Smyth)

Sodium Tripolyphosphate - Upstream Downstream Industry

Raw Materials

Sodium carbonate
White phosphorus
Phosphoric acid
Sulfuric acid
Sodium hydroxide
Barium carbonate
Ammonium nitrate

Sodium Tripolyphosphate - Reference

Reference

1. Lu Zhong, Guan Jinping, Chen Guoqiang. Preparation of flame retardant silk fabric by electrostatic layer-by-layer self-assembly of chitosan/sodium tripolyphosphate [J]. Printing and dyeing, 2018, 044(020):12-16.
2. Jinzhong Niu, Yu Huang, Xinchao Liu, Zhiqiang Zhang, Jufen Tang, Bei Wang, Yishan Lu, Jia Cai, Jichang Jian, single-cell RNA-seq reports different subsets of non-specific cytotoxic cells in teleost, Genomics, Volume 112, Issue 6, 2020, Pages 5170-5179, ISS
3. [IF=1.984] Meng Niu et al."Effects of Inorganic Phosphates on the Thermodynamic, Pasting, and Asian Noodle-Making Properties of Whole Wheat Flour."Cereal Chem. 2014 Jan;91(1):1-7
4. [IF=6.953] Zhen Duan et al."Structural characterization of phosphorylated Pleurotus ostreatus polysaccharide and its hepatoprotective effect on carbon tetrachloride-induced liver injury in mice."Int J Biol Macromol. 2020 Nov;162:533
5. [IF=4.845] Ruiquan Hou et al."Preparation of alginate-chitosan floating granules loaded with 2-methyl-4-chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth."Pest Manag Sci. 2021 Sep;77(9):3942-3951

Sodium Tripolyphosphate - Nature

Open Data Verified Data

white powder, melting point 622 °c. Soluble in water, the aqueous solution is alkaline, the pH value of 1% aqueous solution is 9.7. Gradual hydrolysis in water produces orthophosphate. It can coordinate with calcium, magnesium, iron and other metal ions to form soluble complexes.

Last Update：2024-01-02 23:10:35

Sodium Tripolyphosphate - Preparation Method

Open Data Verified Data

Under the action of stirring, the soda ash is slowly added to the phosphoric acid solution for neutralization reaction, and the neutralized product orthophosphate is dried and polymerized at 350~450 ℃, the sodium tripolyphosphate is generated, and the sodium tripolyphosphate is obtained by cooling and crushing. Alternatively, the neutralization reaction is carried out by extraction of phosphoric acid and soda ash. A large amount of iron, aluminum and other impurities are removed by filtration, the pH value is adjusted, and filtration is carried out, and the obtained solution containing a certain proportion of disodium hydrogen phosphate and sodium dihydrogen phosphate is concentrated in the evaporator to meet the requirements of spray polymerization. The slurry was sprayed into the rotary polymerization furnace, dried and polymerized by hot air spraying powder, and then cooled, crushed and filtered to prepare the sodium tripolyphosphate product.

Last Update：2022-01-01 08:53:15

Sodium Tripolyphosphate - Use

Open Data Verified Data

polyphosphate is one of the earliest, most widely used and most economical corrosion inhibitors for cooling water. In addition to being used as a corrosion inhibitor, polyphosphate can also be used as a scale inhibitor. The polyphosphate is used alone at a concentration of 20-40mg/L at a pH of 6.0-7.0, and is generally used at a concentration of 10-20mg/L at a pH of 7.5-8.5. In order to improve the corrosion inhibition effect and reduce the amount of polyphosphate, usually with zinc salt, molybdate, organic phosphate and other corrosion inhibitors. The phosphorus formula requires a certain concentration of calcium ions in the cooling water. From the point of view of corrosion inhibition should not be less than 30mg/L (CaCOa), dissolved oxygen in water is required to be more than 2mg/L, open circulating cooling water system can meet this requirement. Polyphosphate is suitable for water temperatures below 50 °c. The residence time in water should not be too long. Otherwise, the formation of orthophosphate by hydrolysis of phosphate will increase the tendency to produce phosphate scale.

Last Update：2022-01-01 08:53:16

Sodium Tripolyphosphate - Safety

Open Data Verified Data

sodium tripolyphosphate has mild skin and mucosal irritation, inhalation or ingestion can cause severe Diarrhea. The production and use of sodium tripolyphosphate workers to wear protective equipment, the production workshop should be installed to send air exhaust set. It should be stored in a cool, ventilated and dry warehouse, and should not be stacked in the open air. Do not be affected with damp, prevent high temperature, prevent harmful pollution. Handling should be light and light, to prevent packaging damage.

Last Update：2022-01-01 08:53:16

Sodium Tripolyphosphate - Reference Information

pH range of acid-base indicator discoloration	9.5 - 10.3 at 1g/l at 20°C
EPA chemical substance information	information provided by: ofmpeb.epa.gov (external link)
Introduction	sodium tripolyphosphate, otherwise known as pentasodium phosphate, sodium pyrometaphosphate, STPP, pentasodium tripolyphosphate. White powder Crystal, good fluidity, relative molecular mass 367.86, melting point 622 ℃, soluble in water, the aqueous solution is alkaline. Commonly used in food, as a water retention agent, quality improver, pH regulator, metal chelating agent. The aqueous solution of sodium tripolyphosphate is weakly alkaline (the PH value of 1% aqueous solution is about 9.7), and it forms a suspension (similar to an emulsion) in water with a PH of 4.3~14, that is, dispersion. Sodium tripolyphosphate can also make the liquid, solid particles better soluble in liquid (such as water) medium, so that the appearance of the solution is completely transparent, as if the real solution, this is the solubilization effect. Because of the unique properties of sodium tripolyphosphate, it has become an important ideal raw material in washing powder.
classification	by structure and shape is divided into white powder anhydrous (Na5P3O10) and the right angle parallelepiped crystal of Hexahydrate (Na5P3O10-6H2O) anhydrate type I and Type II of the points. Sodium tripolyphosphate for industrial use is actually a mixture of type I and type II. Type I dissolution rate is fast, and the thermal effect is large when the six hydrate is formed by hydration, and it is easy to absorb moisture and agglomerate in the atmosphere. Type II has slow moisture absorption and is not prone to caking. Therefore, detergent with sodium tripolyphosphate type I content should not be too high, the general control of 10 ~ 30%.
detergent builder	sodium tripolyphosphate is a kind of detergent builder with excellent performance, and is also the most used component in the detergent production process, its role has four aspects: 1, chelating effect on heavy metal ions: heavy metal ions in the water in the washing process can be combined with detergent molecules into insoluble metal salts, so that the washing ability is reduced, or even completely lost. Therefore, it is necessary to add a chelating agent to the detergent that can make the heavy metal ions contained in the water become harmless substances. Sodium tripolyphosphate has a strong chelating effect on heavy metal ions, which can close them up and eliminate their adverse effects on washing. In addition, it can also capture the various metal components contained in the dirt, play a role in the washing process to dissociate the dirt, and can be used as a soap synergist and prevent soap grease from precipitating and frosting. 2, the dirt from the decomposition of glue, emulsification and dispersion: The dirt often contains human secretions (mainly protein and fat substances), also contains sand from the outside, dust, etc. Sodium tripolyphosphate has the effect of swelling and solubilizing the protein in the dirt, so as to have the effect of dissolving glue, promoting the emulsification of fat, and dispersing the solid dirt; it has a strong emulsifying effect on lubricating oil and fat, and can be used to adjust the pH value of the buffer soap. 3, the detergent has the effect of preventing caking: powder synthetic detergent has moisture absorption, such as storage in a place with high humidity, Caking will occur. Caked detergents are extremely inconvenient to use. The hexahydrate formed by the water absorption of sodium tripolyphosphate has the characteristic of being dry. When the detergent formulation is used in a large amount, the caking phenomenon caused by moisture absorption can be prevented, and the dry granular form of the synthetic detergent can be maintained. 4, it has a large alkaline buffer effect, so that the pH value of the washing solution is maintained at about 9.4, which is beneficial to the removal of acidic dirt.
Food Industry Application	moisture retention agent, quality improver, pH regulator, metal chelating agent. China's "health standards for the use of food additives" (GB2760-2011): Canned, fruit juice (fruit) beverages, vegetable protein beverages, the maximum use of 1.0g/kg; Dairy products, poultry products, meat products, ice cream, instant noodles, the maximum use of 5.0g/kg. When compound phosphate is used, canned meat products shall not exceed 1.0g/kg based on phosphate; Condensed milk shall not exceed 0.50g/kg; When this product is used in combination with sodium pyrophosphate and sodium phosphate, phosphate shall not exceed 5g/kg; Western-style cooked and smoked ham shall be subject to the hygienic standard for Western-style cooked and smoked ham GB13101-1991, when used in combination, it should not exceed 5g/kg (Western ham can be added appropriately, and phosphate is 8 g/kg. Other use reference: used for canned ham, under appropriate conditions is conducive to the improvement of product quality, such as product form integrity, good color, tender meat, easy to slice, cut surface gloss. Sodium tripolyphosphate is used for curing ham raw meat, and l00kg meat is added with No. 3 mixed salt (refined salt 91.65%, granulated sugar 8%, sodium nitrite 0.35%)2.2, sodium tripolyphosphate 85g, Fully stirred evenly, in 0~4 deg C cold storage pickling 48~72h, the effect is good. For the production of broad bean canned, can make the Soybean Hull softening. Many fruits and vegetables have a tough skin, with the maturity of fruits and vegetables, the skin is more tough. In the processing of fruits and vegetables blanching or soaking in water, add polyphosphate, can complex calcium, thereby reducing the tenacity of the skin.
Use	sodium tripolyphosphate can increase the tenderness of meat quality, and can also be used as a food improver for fish products and a clarifying agent for beverages. high-efficiency water softener for cooling water treatment in power stations, rolling stock, boilers and chemical fertilizer plants. It is strong for Ca2 + and has a full capacity of 19.5g calcium per 100g. Moreover, due to the chelation and adsorption and dispersion of SHMP, the normal growth process of calcium phosphate and other crystals is destroyed, prevents the formation of calcium phosphate scale. Dosage of 0.5 mg/L, to prevent scaling rate of 95% ~ 100%. tissue improver; Emulsifier; Buffer; Chelating agent; Stabilizer. It is mainly used for the tenderness of canned ham; The soybean hulls are softened in the canned broad bean. It can also be used as a water softener, a pH adjuster and a thickener. sodium tripolyphosphate is used in detergent, as an auxiliary agent, soap synergist and soap to prevent crystallization and Frost, industrial water softening agent, tanning pre-tanning agent, dyeing auxiliary agent, mud control agent, paper with oil pollution prevention agent, paint, kaolin, magnesium oxide, calcium carbonate suspension treatment of effective dispersing agent. Food grade sodium tripolyphosphate can be used as a variety of fish products food improver, beverage clarifier. as a quality improver, there is an effect of increasing the complexing metal ions, pH, ionic strength, etc. of a food, thereby improving the adhesion and water holding capacity of the food. China's provisions can be used for dairy products, fish products, poultry products, ice cream and instant noodles, the maximum use of 5.0g/kg; In canned foods, fruit juice (taste) the maximum consumption of beverage and plant protein beverage was 1.0g/kg.
preparation	The traditional preparation method of sodium tripolyphosphate is to neutralize thermal phosphoric acid with a mass fraction of H3PO4 of 75% by using soda ash suspension, A neutralized slurry with a Na/P ratio of 5:3 is prepared, and the temperature is maintained at 70 ° C. To 90 ° C. After that, the obtained slurry is sprayed into a polymerization furnace for dehydration at a high temperature, and condensed at about 400 °c to sodium tripolyphosphate.
production method	recrystallization the industrial sodium tripolyphosphate is dissolved in water at 60~70 °c, A 17% to 22% solution is prepared and filtered to remove insoluble impurities; The product is then concentrated in vacuo, cooled to crystallize, isolated and dried. The two-step method of thermal phosphoric acid neutralizes 50% ~ 60% of the solution prepared by food-grade thermal phosphoric acid in the neutralization tank with edible soda ash, and the neutralized solution enters the intermediate storage tank, and is pumped by the pump to the spray drying tower for spray drying; the powder was sent to a rotary polymerization furnace, heated to 540 to 580 ° C. For dehydration polymerization, and cooled in air to disintegrate into powder. By adding ethanol to the aqueous solution of the anhydrous substance, hexahydrate can be precipitated. 5Na2CO3+6H3PO4 → 4Na2HPO4+2NaH2PO4 + 5H2O +5CO2 ↑ 4Na2HPO4+2NaH2PO4 → 2Na5P3O10 + 4H2O phosphoric acid (55% ~ 60%) by two-step method after the measurement, the solution is placed in the neutralization tank of stainless steel, heated, and the mixer is started to slowly add soda ash under stirring for neutralization reaction, and the ratio of 2 molecules of disodium hydrogen phosphate to 1 molecule of sodium dihydrogen phosphate is maintained in the neutralization tank. The neutralized mixed solution enters the spray drying tower through the high level tank for drying, and the dried orthophosphate dry material is discharged from the bottom of the tower and sent to the rotary polymerization furnace, A small portion of the dry material taken away by the furnace gas is recovered by the cyclone dust collector. The dry orthophosphate is polymerized in a polymerization furnace at a temperature of 350-450 ° C. To form sodium tripolyphosphate, which is cooled and pulverized to obtain a sodium tripolyphosphate product. 6H3PO4+5Na2CO3 → 4Na2HPO4+2NaH2PO4 + 5H2O +5CO2 ↑ 4Na2HPO4+2NaH2PO4 → 2Na5P3O10 + 4H2O wet-process phosphoric acid one-step phosphate rock was reacted with sulfuric acid to obtain extraction phosphoric acid, first, remove the fluosilicic acid in the defluorination tank with soda ash, The sulfate group was then removed with barium carbonate in the desulfurization tank to reduce the sodium sulfate content in the phosphoric acid. Neutralization was then carried out with soda ash. A large amount of iron, aluminum and other impurities are removed by filtration. After fine adjustment and filtration, the obtained solution containing a certain proportion of disodium hydrogen phosphate and sodium dihydrogen phosphate is concentrated in the evaporator to meet the requirements of spray polymerization. The slurry was sprayed into the rotary polymerization furnace, dried and polymerized by hot air spraying powder. After cooling, crushing and sieving, the sodium tripolyphosphate product was obtained. Ca5F(PO4)3+5H2SO4+10H2O→3H3PO4+5CaSO4·2H2O+HF6H3PO4+5Na2CO3→4Na2HPO4+2NaH2PO4+5H2O+5CO2↑4Na2HPO4+2NaH2PO4→2Na5P3O10+4H2O
toxic substance data	information provided by: pubchem.ncbi.nlm.nih.gov (external link)

Last Update：2024-04-09 18:58:34

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