Sodiumpyrophosphate,anhydrous
Sodium pyrophosphate anhydrous
CAS: 7722-88-5
Molecular Formula: Na4O7P2
Sodiumpyrophosphate,anhydrous - Names and Identifiers
| Name | Sodium pyrophosphate anhydrous |
| Synonyms | TSPP victortspp jiaolinsuanan Sodium pyrophosphate pyrophosphatedesodium Tetrasodium Diphosohate tetranatriumpyrophosphat pyrophosphatetetrasodique Tetrasodium pyrophosphate Tetra Sodium Pyrophosphate sodiumpyrophosphate[na4p2o7] Sodiumpyrophosphate,anhydrous Sodium pyrophosphate anhydrous tetrasodiumpyrophosphate,anhydrous |
| CAS | 7722-88-5 |
| EINECS | 231-767-1 |
| InChI | InChI=1/4Na.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4 |
| InChIKey | FQENQNTWSFEDLI-UHFFFAOYSA-J |
Sodiumpyrophosphate,anhydrous - Physico-chemical Properties
| Molecular Formula | Na4O7P2 |
| Molar Mass | 265.902402 |
| Density | 2.53g/mLat 25°C(lit.) |
| Melting Point | 80 °C |
| Boling Point | 93.8 °C |
| Water Solubility | Soluble in water. Insoluble in ethyl alcohol. |
| Solubility | Lose crystal water at 100 ℃. Soluble in water, insoluble in alcohol. |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | White crystal |
| Specific Gravity | 2.534 |
| Color | White |
| Odor | Odorless |
| Exposure Limit | NIOSH: TWA 5 mg/m3 |
| Merck | 14,9240 |
| Storage Condition | Inert atmosphere,Room Temperature |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Sensitive | Hygroscopic |
| MDL | MFCD00003513 |
| Physical and Chemical Properties | Properties white crystalline powder. Melting Point: 880 ℃ relative density: 2.534 The solubility is easy to dissolve in water. When 20 ℃, the solubility of 100g water is 6.23g. |
| Use | Used as printing and dyeing fine bleaching additives, soft water agent; Applied in industries of detergents as detergent auxiliary, paper production to bleach and electroplating; In food industry it is used as buffering agent, emulsifier, nutrition ingredients and quality improver. |
Sodiumpyrophosphate,anhydrous - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R41 - Risk of serious damage to eyes R22 - Harmful if swallowed |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S39 - Wear eye / face protection. |
| WGK Germany | 3 |
| RTECS | UX7350000 |
| TSCA | Yes |
| HS Code | 28353990 |
Sodiumpyrophosphate,anhydrous - Upstream Downstream Industry
| Raw Materials | Phosphoric acid Sodium hydroxide |
Sodiumpyrophosphate,anhydrous - Nature
Open Data Verified Data
- anhydrous sodium pyrophosphate is a white powder or crystal. Relative density 2. 534; Melting point 988 ℃. Soluble in water, different temperatures in water solubility (g/lOOmL):2.61(O ℃), 6.70(25 ℃), 42.2(100 ℃). The aqueous solution is relatively stable at 70 ℃, and is hydrolyzed to disodium hydrogen phosphate during boiling. Its aqueous solution is alkaline. Insoluble in alcohol. With the alkaline earth metal ions can form a complex, and Ag + when the generation of white silver pyrophosphate. Deliquescence.
- sodium pyrophosphate decahydrate (tetrasodium pyrophos-phate decahydrate) is a colorless transparent crystal. Can stroke in dry air. Melting Point: 79.5 °c; D1.82. Weathering in dry air. Soluble in water, solubility in water at different temperatures (g/lOOmL):3. 16 (0 ℃), 6.23 (20 ℃), 8.14 (25 ℃), 21. 83 (60 ℃), 30. 04 (80 degrees C). Insoluble in alcohol. The aqueous solution is alkaline, and the pH value of the 1% aqueous solution at 25 is 10.2. The aqueous solution was heated and boiled to form sodium hydrogen phosphate. Water of crystallization was lost when heated to 10 °c. It has a strong pH buffer, and has a certain chelating effect on metal ions.
Last Update：2024-01-02 23:10:35
Sodiumpyrophosphate,anhydrous - Preparation Method
Open Data Verified Data
- dry polymerization two-step method: Soda Ash is added to a neutralizer, heated and dissolved with stirring, and phosphoric acid is added to perform neutralization reaction to produce disodium hydrogen phosphate. The terminal pH value of the reaction is controlled to 8.2 to 8.6, and the concentration of the solution after the reaction must be not less than 40. Be (relative density 1.383). Decolorization filtration was performed. The disodium hydrogen phosphate solution was concentrated to 480Be (relative density 1.498). Sent to the doctor blade mechanism into a water-free disodium hydrogen phosphate sheet. The disodium hydrogen phosphate sheet was sent to the box type polymerization furnace to heat the polymerization, and the temperature of the material was controlled between 160 and 240. The sodium pyrophosphate with complete polymerization is crushed after cooling, and the general particle size is less than or equal to 250 μm, and the finished product of anhydrous sodium pyrophosphate is obtained. In the two-step process for producing anhydrous sodium pyrophosphate, the drying equipment of disodium hydrogen phosphate can be changed to spray drying tower, and the polymerization equipment can be changed to Rotary polymerization furnace, which is more suitable for large-scale continuous production.
- dry polymerization one-step method: a high-temperature gas is introduced from the lower part of the boiling polymerization furnace, and the high-temperature gas is passed through the sieve plate into the fixed material layer of the furnace cavity, and the material layer is composed of solid particles of disodium hydrogen phosphate preliminarily calcined and polymerized after drying. The material was further heated and polymerized to form a sodium pyrophosphate product, which was continuously discharged from the upper outlet of the sieve plate. The heating gas continues upward through the boiling layer of the furnace cavity. The preliminarily dried disodium hydrogen phosphate and the undried disodium hydrogen phosphate float up and down, and several processes such as mixing, drying and polymerization occur to prepare the anhydrous sodium pyrophosphate finished product. Some small particles of solid material entrained in the tail gas are discharged from the top of the furnace, and the tail gas is treated by a cyclone separator to collect the lower part of the solid material and return to the boiling layer.
Last Update：2022-01-01 09:03:55
Sodiumpyrophosphate,anhydrous - Introduction
Stroke in dry air. The aqueous solution is alkaline. It is easy to absorb water in the air and deliquesce.
Last Update：2022-10-16 17:28:38
Sodiumpyrophosphate,anhydrous - Use
Open Data Verified Data
used as a quality improver for cans, fruit drinks, dairy products and so on, it has the properties of polymerized pyrophosphate, emulsifying, dispersing, preventing fat oxidation and improving casein viscosity, it also has an inhibitory effect on food that is easy to oxidize and ferment. Both crystalline and anhydrous sodium pyrophosphate are rarely used alone and are generally used after being formulated with other condensed phosphates. A mixed preparation of sodium pyrophosphate and Sodium polyphosphate can be used as an elasticity enhancer. Sodium pyrophosphate can also be used to make the color of soybean paste and soy sauce bright, to prevent their discoloration. In the fish meat products, the addition of sodium pyrophosphate is 0.05% ~ 0.3% of the raw meat.
Last Update：2022-01-01 09:03:56
Sodiumpyrophosphate,anhydrous - Safety
Open Data Verified Data
external polypropylene woven bag packaging, the inner packaging is divided into: two layers of polyethylene plastic bags with a layer of kraft paper or two layers of polyethylene plastic bags in two forms. The plastic bag is welded and sealed, and the Kraft paper bag is sutured and sealed. 25kg or 50kg net weight per bag. Should be stored in a ventilated, dry warehouse. It is not allowed to be stacked in the open air. The use of covered vehicles or covered transport, anti-sun exposure and rain. It is not allowed to be stored and mixed with toxic and hazardous substances. When loading and unloading should be light, to prevent the phenomenon of weight loss caused by the rupture of the package. The shelf life of this product is valid for 1 year from the date of delivery. Fire can be suppressed with water, foam or carbon dioxide.
Last Update：2022-01-01 09:03:56
Sodiumpyrophosphate,anhydrous - Reference Information
| pH range of acid-base indicator discoloration | 10.3 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | for electroplating industry ingredients, water treatment agent, detergent, boiler detergent, The metal chelating agent is used as a fine bleaching aid for printing and dyeing, a water softener, etc. It is used as a complexing agent for copper in electroplating solution. Used as a rust remover in mechanical processing. With the preparation of health insurance powder bleaching aids, wool degreasing agent. Auxiliaries for bleaching, printing and finishing of plant fibers. Used in synthetic detergents as builders. In the production of toothpaste with calcium hydrogen phosphate when adding the right amount of sodium pyrophosphate to form a colloid, play a stabilizing role. It is used as dispersant and emulsifier in chemical industry. Water treatment as water softener, boiler detergent. It is a raw material for the production of other pyrophosphates. It is used as a quality improver for canned foods, fruit drinks, dairy products, soybean milk, etc. It is often used in formulations with other condensed phosphates. 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 regulations can be used for dairy products, poultry and fish products, meat 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. As a whitening agent for the compound of potato starch, the maximum use of 0.025g/kg. The electroplating industry is used to formulate plating solutions that can form complexes with iron. Wool textile industry used as wool degreasing agent and bleaching agent. The paper industry is used for the bleaching of paper and plant fibers. The printing and dyeing industry is used as an auxiliary in printing and dyeing and fine bleaching. The daily chemical industry is used as a toothpaste additive, which can form a colloid with calcium hydrogen phosphate and play a stabilizing role, and can also be used for synthetic detergents and the production of shampoo products. As a water softener in water treatment. As a rust remover in mechanical processing. It is used as dispersant and emulsifier in chemical industry. It can also be used as a water treatment agent, oil drilling, etc., as a quality improver, emulsifier, buffer, chelating agent, etc. in the food industry. water softener, rust remover, metal electrolysis analysis, dispersion and emulsifier. |
| Overview | anhydrous sodium pyrophosphate is a colorless transparent crystal or white powder. The relative density is 1.824 and the melting point is 880 ℃. Soluble in water, insoluble in alcohol, the aqueous solution is alkaline, easy weathering, moisture absorption. It has a strong pH buffer, and has a certain chelating effect on metal ions. Anhydrous sodium pyrophosphate is mainly used as a soft water softener, printing and dyeing bleaching auxiliary, wool degreasing agent, boiler detergent, metal ion chelating agent, dispersant, printing and dyeing and fine bleaching of grass products. Detergent additives were synthesized. Regulator of oil well mud, additive for the production of ABS resin. Used as a complexing agent for copper in electroplating baths. Sodium pyrophosphate decahydrate is primarily used as a toothpaste stabilizer. In the food industry as emulsifiers, buffers, chelating agents, gelling agents, stabilizers. When sodium pyrophosphate meets Ag, white silver pyrophosphate is formed, while the reaction of orthophosphate with Ag produces yellow Silver orthophosphate precipitate, which is a characteristic reaction that distinguishes the two salts from each other. Edible sodium pyrophosphate has integration with metal particles, dispersion, flocculation, emulsification, prevention of lipid and oxidation, casein viscosity, etc. High pH value has the effect of inhibiting food spoilage. |
| solubility of anhydrous sodium pyrophosphate in water (g water) | 0 ℃-3.16g;10 ℃-3.95g;20 ℃-6.23g;30 ℃-9.95g;40 ℃-13.5g;50 ℃-17.45g;60 ℃-21.83g;80 ℃-30.04g;100 ℃-40.26g |
| reference quality standard | appearance white powder or crystalline anhydrous sodium pyrophosphate (Na4P2O7)(dry basis) ≥ 96.5% pH value (1% aqueous solution) ≤ 0.20 orthophosphate 9.9-10.7 (meet inspection requirements) arsenic (As) ≤ 0.0003% heavy metals (Pb) ≤ 0.001% fluoride (calculated as F) ≤ 0.005% ignition loss ≤ 0.50% |
| toxicity | Adl 0-70 mg/kg (based on total phosphorus). According to China's GB 2760-86 as quality improver when the maximum use of 1.0g/kg. When the compound phosphate is used, the total amount of phosphate: Canned meat products should not exceed 1.0g/kg, condensed milk should not exceed 0.5g/kg. |
| production method | 75% food-grade phosphoric acid solution is neutralized with soda ash in proportion above 85 ℃, control the density of the neutralized liquid phase to be 1.4~1.45; Then boil for 15min, add caustic soda to make the pH value of the solution to be 8.9~9.0; Then send the neutralized liquid to a spray dryer for spray drying, the inlet temperature was controlled to 300 ° C. And the outlet temperature was 110-120 ° C. Finally, the dried disodium hydrogen phosphate was fed into the polymerization furnace, and the product was polymerized at 450 ° C. Na2CO3 + H3PO4 → Na2HPO4 + H2O + C02 ↑ 2Na2HPO4 → Na4P207 + H2O disodium hydrogen phosphate method to eat disodium hydrogen phosphate (Na2HPO4? 12H2O) heated to 115~130 ℃ to remove the water of crystallization and change into anhydrous disodium hydrogen phosphate, and then send the anhydrous disodium hydrogen phosphate to the polymerization furnace to be heated to 160~240 ℃ for melt polymerization, after cooling and crushing, the edible anhydrous sodium pyrophosphate product was prepared. Its Na2HPO4? 12H2O [Δ] → Na2HPO4 +12h2o2na2hpo4 [Δ] → Na4P2O7 + H2O dry polymerization two-step method the soda ash is added to the neutralizer and heated to dissolve under stirring, phosphoric acid was added for neutralization reaction to generate disodium hydrogen phosphate. The terminal Ph of the reaction is controlled to 8.2 to 8.6, and the concentration of the solution after the reaction must be not less than 40 ° Bé (relative density 1.383). Decolorization filtration was performed. The disodium hydrogen phosphate solution was concentrated to 48 Bé (relative density 1.498). Sent to the doctor blade mechanism into a water-free disodium hydrogen phosphate sheet. The disodium hydrogen phosphate sheet was sent to the box type polymerization furnace to heat the polymerization, and the temperature of the material was controlled between 160 and 240. The sodium pyrophosphate with complete polymerization was crushed after cooling and generally passed through a 60 mesh sieve to obtain a finished anhydrous sodium pyrophosphate product. In the two-step process for producing anhydrous sodium pyrophosphate, the drying equipment of disodium hydrogen phosphate can be changed to spray drying tower, and the polymerization equipment can be changed to Rotary polymerization furnace, which is more suitable for large-scale continuous production. The H3PO4 + Na2CO3 → N2HPO4 + H2O + CO2 * 2 Na2HPO4 [Δ] → Na4P2O7 + H2O dry polymerization one-step method with high temperature gas from the lower part of the boiling polymerization furnace, through the sieve plate into the cavity of the fixed material layer, the material layer is composed of dried and preliminarily calcined polymerization of disodium hydrogen phosphate solid particles. The material was further heated and polymerized to form a sodium pyrophosphate product, which was continuously discharged from the upper outlet of the sieve plate. The heating gas continues upward through the boiling layer of the furnace cavity. The preliminarily dried disodium hydrogen phosphate and the undried disodium hydrogen phosphate float up and down, and several processes such as mixing, drying and polymerization occur to prepare the anhydrous sodium pyrophosphate finished product. Some small particles of solid material entrained in the tail gas are discharged from the top of the furnace, and the tail gas is treated by a cyclone separator to collect the lower part of the solid material and return to the boiling layer. Its Na2HPO4? 2H2O [Δ] →Na2HPO4+2H2O2Na2HPO4[△]→Na4P2O7+H2O |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 19:05:15
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Raw Materials for Sodiumpyrophosphate,anhydrous