10039-32-4
Disodium phosphate dodecahydrate
CAS: 10039-32-4
Molecular Formula: H25Na2O16P
10039-32-4 - Names and Identifiers
10039-32-4 - Physico-chemical Properties
| Molecular Formula | H25Na2O16P |
| Molar Mass | 358.14 |
| Density | 1,52 g/cm3 |
| Melting Point | 35 °C |
| Boling Point | 158℃ |
| Water Solubility | 218 g/L (20 ºC) |
| Solubility | H2O: 0.1M at20°C, clear, colorless |
| Appearance | White crystal |
| Color | White |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['λ: 260 nm Amax: 0.01', , 'λ: 280 nm Amax: 0.01'] |
| PH | 9.0-9.3 (25℃, 50mg/mL in H2O) |
| Storage Condition | Store at +15°C to +25°C. |
| Sensitive | Sensitive to light |
| MDL | MFCD00149181 |
| Physical and Chemical Properties | Solubility: H2O: 0.1 M at 20 ℃, clear, colorless WGK Germany:1 RTECS:TC5725000 |
| Use | The analysis was used as a buffer to prepare Leptospira medium and determine potassium. |
10039-32-4 - Risk and Safety
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 3077 9 / PGIII |
| WGK Germany | 1 |
| RTECS | TC5725000 |
| HS Code | 28352200 |
| Toxicity | LD50 orally in Rabbit: > 2000 mg/kg |
10039-32-4 - Reference
| Reference Show more | 1. Liang Xinhe, Wang Tao, Du Yanjia, et al. Optimization of Extraction Process of Hypoglycemic Components from Birch and Corn Silk by Orthogonal Experiment [J]. Jilin Traditional Chinese Medicine, 2019. 2. Zhao Shilei, He Xu, Wang Aizhu, et al. Study on Enzymatic Improvement of Soybean Isoflavone Alycone Content in Soybean Milk [J]. Food Industry, 2019, 040(001):100-104. 3. Li Na, Huang Huaisheng, Zhong Xinggang, Su This article. Tea Quality Analysis of Tea Tree Variety Xiaoxianghong 21-3 under Improved Technological Conditions [J]. Tea communication, 2020,47(03):427-432. 4. Shuaishuai Yan, Hongjun Shao, Zhihao Zhou, Qi Wang, Luhua Zhao, Xingbin Yang, Non-extractable polyphenols of green tea and their antioxidant, anti-α-glucosase capacity, and release during in vitro digestion, Journal of Functional Foods, Volume 42, 2018, |
10039-32-4 - Nature
Open Data Verified Data
A translucent monoclinic crystal or particle. Exposed in the air at room temperature, it is easy to lose 5 molecules of water and become heptahydrate. The relative density was 1. 5235. Insoluble in ethanol. It loses all the crystal water at 100 ℃ and becomes anhydrous. It is decomposed into sodium pyrophosphate at 250 ℃.
Last Update：2025-06-10 22:55:16
10039-32-4 - Preparation Method
Open Data Verified Data
The thermal phosphoric acid was added to the corrosion-resistant neutralization reactor, and an appropriate amount of caustic soda was slowly added under stirring to adjust the pH value at 8.4-8.6. Then, the filtrate is filtered and sent to a cooling crystallizer, and crystals are precipitated when cooled to 25-27 ° C., and after separation and drying, a finished product of disodium hydrogen phosphate dihydrate is obtained. Alternatively, wet-process phosphoric acid is added to the corrosion-resistant neutralization reactor, and the soda ash solution is slowly added under stirring to carry out the neutralization reaction until the neutralization solution is slightly alkaline. The neutralization temperature was maintained at 90-100 °c. Then, the filtrate was filtered, concentrated by evaporation, crystallized by cooling, centrifuged and dried to obtain a final product of disodium hydrogen phosphate dihydrate.
Last Update：2025-06-10 22:55:16
10039-32-4 - Introduction
Soluble in water, the aqueous solution is weakly alkaline, the pH value of 1% aqueous solution is 8.8~9.2, and it is insoluble in alcohol. Melted and lost 5 crystal water at 35.1 ℃. It is easy to weather in the air. When placed in the air at room temperature, about 5 crystal water is lost to form heptahydrate. When heated to 100 ℃, all crystal water is lost to become anhydrous, and it decomposes into sodium pyrophosphate at 250 ℃. Carefully dry below 34°C to obtain white powder of disodium hydrogen phosphate dihydrate. Solubility in water: 218g/L (20°C).
Last Update：2022-10-16 17:11:23
10039-32-4 - Application
Open Data Verified Data
disodium hydrogen phosphate is mainly used as a water softener for boiler water in the field of water treatment for preventing scaling and removing scale that has formed. It and the water of the hard salt, the formation of insoluble flocculent precipitation, so that the water to be softened.
Last Update：2025-08-19 16:24:40
10039-32-4 - Safety
Open Data Verified Data
anhydrous substance has mild irritation to mucosa, and oral administration can cause Diarrhea. Therefore, the production and use of personnel in the operation should wear protective equipment, to prevent dust into the body. The working area is well ventilated to prevent dust from flying, and wet dust suction should be used. Should be stored in a cool, ventilated and dry warehouse. Storage and transportation should pay attention to waterproof, sunscreen, to prevent packaging damage.
Last Update：2025-06-10 22:55:16
10039-32-4 - Reference Information
| pH indicator color change ph range | 8.4 - 9.6 at 36g/l at 25 c |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| toxicity | Adl 0~70 mg/kg (based on total phosphorus);MLD>985 ≤ 1075 mg/kg (rabbit, intravenous injection). According to our country's regulations (GB2760-86), it can be used for condensed milk with a maximum usage of 0.5 g/kg (based on the total amount of phosphate). |
| use | as a quality improver, it has the functions of improving the complex metal ions, pH value, increasing ionic strength, etc. of food, thus improving the strength and water holding capacity of food. According to regulations of our country, it can be used for condensed milk with a maximum usage of 0.5 g/kg; It can also be used for compound baking powder and should be used appropriately according to production requirements. used as boiler water softener, flame retardant for fabrics, wood and paper, glaze and solder. Used in the production of detergents, cleaning agents for printing plates and mordants for dyeing. Used in the printing and dyeing industry as a stabilizer for hydrogen peroxide bleaching, a filler for rayon (reinforcing the strength and elasticity of the silk). It is a raw material for the manufacture of sodium pyrophosphate and other phosphates, as well as a culture agent for monosodium glutamate, erythromycin, penicillin, streptomycin and sewage biochemical treatment products. It is also used for electroplating and tanning. As a feed phosphorus supplement additive. Used to make baking powder. Used as quality improver, emulsifier, nutrition fortifier, fermentation aid and binder in food processing. analysis as buffer, preparation of leptospira culture medium, determination of potassium. |
| production method | recrystallization method dissolves industrial grade disodium hydrogen phosphate in distilled water at 80~85 ℃ to prepare a saturated solution, adds decolorant, heavy metal removal agent and arsenic removal agent for purification, then adds edible phosphoric acid to adjust the pH value, then filters, chilled crystallization, centrifuged separation and dried at room temperature to prepare edible disodium hydrogen phosphate dihydrate finished product. Its Na2HPO4?12H2O → Na2HPO4?12H2O (1) recrystallization method. Dissolve the industrial product disodium hydrogen phosphate dodecahydrate in hot water. After removing arsenic and heavy metals through sulfide, decolorize with activated carbon, and then adjust to PH8.2-8.4 with food phosphoric acid. After filtration, cooling and crystallization, centrifugation and drying, the product is obtained. (2) Thermal phosphoric acid method. It is obtained by neutralization of thermal phosphoric acid with soda ash or sodium hydroxide. Add sodium hydroxide or soda ash to concentrated phosphoric acid and control PH to 8.9-9.0. The neutralization liquid is filtered, concentrated to a relative density of 1.24-1.26(26-30 Bé) and then cooled to crystallize below 35 ℃. The product is obtained by centrifugal separation and drying, and the mother liquor is sent to the neutralization process for reuse. The thermal phosphoric acid method adds the thermal phosphoric acid to a stirred and corrosion-resistant neutralization reactor, and slowly adds a soda ash solution under stirring to neutralize the reaction, so that the pH value of the reaction solution is 8.4~8.6, and then filter, Add caustic soda solution to adjust the pH value to 8.4~8.6, send it to a cooled crystallizer and cool it to 25~27 ℃ to precipitate crystals, and separate and dry it to obtain a finished product of disodium hydrogen phosphate dihydrate. Its H3PO4 Na2CO3 → Na2HPO4 H2O CO2 ↑ extraction phosphoric acid method adds the extracted phosphoric acid to a stirred and corrosion-resistant neutralization reactor, and slowly adds soda ash solution under stirring for neutralization reaction until the neutralization solution is slightly alkaline (Ph = 8.4~8.6), the neutralization temperature is maintained at 90 ~ l00 ℃, filtered while hot, and the filtrate is evaporated and concentrated to 28~30 ° Bé, and sent to cooling crystallization, after centrifugal separation and drying at room temperature, a finished product of disodium hydrogen phosphate dihydrate was prepared. Its Ca5F(PO4)3 5H2SO4 10H20 → 3H3PO4 5 CaSO4?2H2O HF ↑ H3PO4 Na2CO3 → Na2HPO4 H2O CO2 ↑ recrystallization method dissolves disodium hydrogen phosphate dodecahydrate in hot water, removes arsenic and heavy metals by sulfide, decolorizes with activated carbon, adjusts with food phosphoric acid to a Ph value of 8.2-8.4, and then filters, crystallizes, centrifuges, and dries to obtain the product. The neutralization method adds sodium hydroxide or soda ash to concentrated phosphoric acid, and controls the Ph value to 8.9~9.0; filters and concentrates the neutralization liquid, and then cools it to crystallize below 35 ℃; centrifugally separate and dry to obtain the product, and the mother liquor can be sent to the neutralization process for reuse. Na2CO3 H3PO4→Na2HPO4 H2O CO2↑ |
Last Update：2024-04-09 02:00:05
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