7722-88-5 - 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 |
7722-88-5 - 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. |
7722-88-5 - 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 |
7722-88-5 - Upstream Downstream Industry
7722-88-5 - 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
7722-88-5 - 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
7722-88-5 - 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
7722-88-5 - 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
7722-88-5 - 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