Pyrophosphoric acid tin(2+) salt
Tin (II) pyrophosphate
CAS: 15578-26-4
Molecular Formula: O7P2Sn2
Pyrophosphoric acid tin(2+) salt - Names and Identifiers
| Name | Tin (II) pyrophosphate |
| Synonyms | Stannous TechneScan PYP tin(ii) phosphate ditin pyrophosphate Tin ii pyrophosphate ditin(2+) diphosphate Tin (II) pyrophosphate Stannous pyrophosphate tin(ii) phosphate (pyro) tinpyrophosphate(6ic,7ci) Pyrophosphoric acid tin(2+) salt 2,2'-Oxybis[1,3-dioxa-2-phospha-4-stanna(II)cyclobutan-2-one] |
| CAS | 15578-26-4 |
| EINECS | 239-635-5 |
| InChI | InChI=1/H4O7P2.2Sn.8H/c1-8(2,3)7-9(4,5)6;;;;;;;;;;/h(H2,1,2,3)(H2,4,5,6);;;;;;;;;;/q;2*+2;;;;;;;;/p-4/rH4O7P2.2H4Sn/c1-8(2,3)7-9(4,5)6;;/h(H2,1,2,3)(H2,4,5,6);2*1H4/q;2*+2/p-4 |
Pyrophosphoric acid tin(2+) salt - Physico-chemical Properties
| Molecular Formula | O7P2Sn2 |
| Molar Mass | 411.36 |
| Density | 4,01 g/cm3 |
| Melting Point | >400°C (dec.) |
| Water Solubility | Insoluble in water. |
| Appearance | Powder |
| Specific Gravity | 4.01 |
| Color | White |
| Exposure Limit | ACGIH: TWA 2 mg/m3NIOSH: IDLH 100 mg/m3; TWA 2 mg/m3 |
| Merck | 14,8788 |
| Storage Condition | Refrigerator |
| MDL | MFCD00049544 |
| Physical and Chemical Properties | White crystalline or crystalline powder. Slightly chlorine odor. melting point 62 ℃ soluble in water, its aqueous solution is alkaline. |
| Use | Mainly used for non-cyanide plating (tin), toothpaste filler, Clay refining, etc |
Pyrophosphoric acid tin(2+) salt - 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. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 2 |
| RTECS | JL6737500 |
| TSCA | Yes |
| HS Code | 28353990 |
Pyrophosphoric acid tin(2+) salt - Nature
Open Data Verified Data
White crystalline or amorphous powder. Relative density 4. 009(16.4 ℃). Insoluble in water, soluble in concentrated acid.
Last Update：2024-01-02 23:10:35
Pyrophosphoric acid tin(2+) salt - Preparation Method
Open Data Verified Data
double decomposition method: first, stannous chloride and sodium pyrophosphate were dissolved in water, and an appropriate amount of activated carbon was added to decolorize and filter to obtain a detergent solution. The two solutions were then adjusted to a certain concentration by adding water, respectively. The sodium pyrophosphate solution was first added to the reactor, and the stannous chloride solution was slowly added under stirring for metathesis reaction. The end point of the reaction was controlled so as not to cause an excess of stannous chloride. A tin pyrophosphate precipitate was generated, and the supernatant was removed by standing, water was added and washed with stirring. The precipitate was then left to stand, and the supernatant was removed by repeating several times to remove most of the sodium chloride. The precipitate was then placed in a centrifugal separator for dehydration, washed with clean water until chloride ions were absent, and dried to obtain a finished tin pyrophosphate.
Last Update：2022-01-01 11:03:10
Pyrophosphoric acid tin(2+) salt - Application
Open Data Verified Data
tin plating is mainly used for cyanide-free electroplating. As a toothpaste filler, there is a slight dissociation in the toothpaste, which has a certain effect on the prevention of dental diseases. Printing and dyeing industry for dyeing, ceramic industry for refined clay. Appropriate addition in the coating industry can alleviate the settling rate of the paint filler in the paint and improve the paint performance.
Last Update：2025-08-19 16:24:40
Pyrophosphoric acid tin(2+) salt - Safety
Open Data Verified Data
an iron drum packed with polyethylene plastic bags. 50kg net weight per barrel. Should be stored in a ventilated, dry warehouse. Containers must be sealed and cannot be co-stored with acids. Protection against rain, damp and sun exposure during transport. When loading and unloading should be light to prevent packaging damage. In case of fire, it can be suppressed by water, sand and all kinds of fire extinguishing.
Last Update：2025-06-10 22:55:16
Pyrophosphoric acid tin(2+) salt - Reference Information
| LogP | -1 at 20℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | stannous pyrophosphate, chemical formula Sn2P2O7, molecular weight 411.32, amorphous powder. It is obtained by heating tin (II) diphosphate at 350~400 ℃. Mainly used for non-cyanide plating tin plating. Used as a filler for toothpaste, it is slightly dissociated in toothpaste and has a certain effect on preventing dental diseases. The printing and dyeing industry is used for dyeing, and the ceramic industry is used for refining clay. Appropriate addition in the coating industry can alleviate the settling speed of paint filler in paint and improve paint performance. It is also used for cyanide-free electroplating (tin plating), toothpaste filler, clay refining, etc. |
| preparation method | 1. metathesis method first dissolves stannous chloride and sodium pyrophosphate in water respectively, and adds appropriate amount of activated carbon for decolorization and filtration to obtain a clean solution. Then add water to the two solutions to a certain concentration. First, the sodium pyrophosphate solution is added to the reactor, and the stannous chloride solution is slowly added under stirring for metathesis reaction. Control the end of the reaction without excessive stannous chloride. The tin pyrophosphate precipitate is generated. After standing, the supernatant is removed, water is added and washed under stirring, and then standing for precipitation, the supernatant is removed, and the supernatant is removed several times to wash out most of the sodium chloride. Then put the sediment into a centrifugal separator for dehydration, and wash it with clean water until it is free of chloride ions, and dry to produce a finished product of tin pyrophosphate. Its Na4P2O7 2SnCl2 → Sn2P2O7 4NaC1 2. Stannous chloride or stannous sulfate with a short storage period (0-72 hours) reacts with stoichiometric alkali pyrophosphate solution (concentration 1-30%) at room temperature, and the reaction precipitate is washed with water to a concentration of less than 1%, filtered, dried and crushed to obtain a white powdery product. The complex solution formed by the product and alkali metal pyrophosphate is colorless and transparent, with a turbidity of only 0-5 degrees. |
| application | 1. for electroplating industry: tin plating for cyanide-free electroplating; 2. for toothpaste manufacturing industry: used as a filler for toothpaste, slightly dissociated in toothpaste, which has a certain effect on preventing dental diseases; 3. for printing and dyeing industry: for dyeing; 4. for ceramic industry: used for refining clay; 5. Used in the coating industry: Appropriate addition in the coating industry can alleviate the settling speed of paint filler in the paint and improve the paint performance. |
| Main reference materials | /ChemicalProductProperty_CN_CB2710459.htm [1] Shen Panwen, edited by Wang Jitao. Compound dictionary. Shanghai: Shanghai Lexicographic Publishing House. 2002. Page 190. [2] Zhang Cheng. Preparation of stannous pyrophosphate from stannous chloride high-iron waste liquid. Popular technology. 2014.16(181):65-66. |
| usage | is mainly used for tin plating of cyanide-free electroplating. Used as a filler for toothpaste, it is slightly dissociated in toothpaste and has a certain effect on preventing dental diseases. The printing and dyeing industry is used for dyeing, and the ceramic industry is used for refining clay. Appropriate addition in the coating industry can alleviate the settling speed of paint filler in paint and improve paint performance. Mainly used for non-cyanide electroplating (tin plating), toothpaste filler, clay refining, etc. |
| production method | metathesis method first dissolves stannous chloride and sodium pyrophosphate in water respectively, and a proper amount of activated carbon is added for decolorization and filtration to obtain a clean solution. Then add water to the two solutions to a certain concentration. First, the sodium pyrophosphate solution is added to the reactor, and the stannous chloride solution is slowly added under stirring for metathesis reaction. Control the end of the reaction without excessive stannous chloride. The tin pyrophosphate precipitate is generated. After standing, the supernatant is removed, water is added and washed under stirring, and then standing for precipitation, the supernatant is removed, and the supernatant is removed several times to wash out most of the sodium chloride. Then put the sediment into a centrifugal separator for dehydration, and wash it with clean water until it is free of chloride ions, and dry to produce a finished product of tin pyrophosphate. Its Na4P2O7 2SnCl2 → Sn2P2O7 4NaC1 |
Last Update：2024-04-10 22:29:15
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