中文
English
Русский
Technical Specifications
Basic Information
| Item | Parameters |
|---|---|
| Product Name | Dipotassium Phosphate |
| English Name | Dipotassium phosphate (DKP) |
| CAS Number | 16788-57-1 |
| Chemical Formula | K2HPO4, K2HPO4·3H2O |
| Molecular Weight | 174.18 (anhydrous), 228.22 (trihydrate) |
| Appearance | White crystal or amorphous white powder |
| Relative Density | 2.338 |
Physical and Chemical Properties
| Item | Description |
|---|---|
| Appearance | White crystal or amorphous white powder |
| Water Solubility | Easily soluble in water, aqueous solution is slightly alkaline |
| Alcohol Soluble | Slightly soluble in alcohol |
| Hygroscopicity | Hygroscopic |
| Thermal Stability | Self-dissolves at elevated temperatures; dehydrates internally to form potassium pyrophosphate at 204°C. |
| pH (1% aqueous solution) | Approx. 9 |
Technical Specifications — Industrial Grade (HG/T4510-2013)
| Parameter Name | DKP·3H2O | Anhydrous Substance |
|---|---|---|
| Dipotassium hydrogen phosphate (K2HPO4) w/% ≥ | 98 | 98 |
| P₂O₅ w/% ≥ | 30.5 | 40 |
| Potassium Oxide (K2O) w/% ≥ | 40.5 | 53 |
| Water Insolubles w/% ≤ | 0.02 | 0.02 |
| Chloride (as Cl) w/% ≤ | 0.05 | 0.05 |
| Iron (Fe) w/% ≤ | 0.003 | 0.003 |
| Arsenic (As) w/% ≤ | 0.01 | 0.01 |
| Heavy Metals (as Pb) w/% ≤ | 0.005 | 0.005 |
| pH (1% aqueous solution) | 9.0 — 9.4 | |
| Loss on drying w/% ≤ | 22 — 26 | 2 |
Technical Specifications — Food Grade (GB25561-2010)
| Parameter Name | DKP·3H2O | Anhydrous Substance |
|---|---|---|
| Dipotassium hydrogen phosphate (K2HPO4) w/% ≥ | 98 | 98 |
| P₂O₅ w/% ≥ | 30.5 | 40 |
| Potassium Oxide (K2O) w/% ≥ | 40.5 | 53 |
| Water Insolubles w/% ≤ | 0.2 | 0.2 |
| Fluoride (as F) w/% ≤ | 0.001 | 0.001 |
| Arsenic (As) w/% ≤ | 0.0003 | 0.0003 |
| Heavy Metals (as Pb) w/% ≤ | 0.001 | 0.001 |
| Lead (Pb) w/% ≤ | 0.0002 | 0.0002 |
| pH (1% aqueous solution) | 8.6 — 9.4 | |
| Loss on drying w/% ≤ | 22 — 26 | 2 |
Packaging and Storage
| Item | Instructions |
|---|---|
| Packaging Method | Inner Plastic Outer Woven |
| Packaging Specifications | 25 kg/bag, 50 kg/bag, 1000 kg/bag (ton bag) |
| Storage Conditions | Store in a cool, dry, and well-ventilated place |
| Shelf Life | 24 months (under sealed storage conditions) |
Product Introduction
Product Overview
Dipotassium phosphate (DKP), CAS No. 16788-57-1, chemical formula K₂HPO₄ (anhydrous) or K₂HPO₄·3H₂O (trihydrate). Molecular weights 174.18 and 228.22 respectively. White crystalline or amorphous white powder, easily soluble in water, aqueous solution slightly alkaline, slightly soluble in alcohol, hygroscopic.
Physical and Chemical Properties
- AppearanceWhite crystals or amorphous white powder
- Water SolubilityEasily soluble in water, aqueous solution is slightly alkaline
- Alcohol SolubleSlightly soluble in alcohol
- HygroscopicityHygroscopic, self-dissolves at higher temperatures
- Thermal StabilityDehydrates internally at 204°C to convert into potassium pyrophosphate.
- Relative Density: 2.338
- pHApproximately 9 in 1% aqueous solution
Specifications & Standards
| Grade | Implementation Standard | Main Applications |
|---|---|---|
| Industrial Grade | HG/T4510-2013 | Water-soluble fertilizer formulation, boiler water treatment, electroplating additives. |
| Food Grade | GB25561-2010 | Food Processing, Pharmaceutical Culture Media, Feed Additives |
Nutrient Indicators
Application Reference
Agricultural Production
Used as a raw material for formulating high-efficiency water-soluble fertilizers and compound fertilizers, and as a raw material for producing potassium pyrophosphate.
- Water-Soluble Fertilizer Raw Materials
- Compound Fertilizer Formulation
- Potassium Pyrophosphate Raw Material
Boiler Water Treatment
Used for boiler water treatment. Also serves as a buffer in chemical analysis, in metal phosphating processes, and as an electroplating additive.
- Boiler Water Treatment Agent
- Chemical Buffer
- Metal Phosphating Treatment
- Electroplating Additives
Antifreeze Applications
Used as a corrosion inhibitor in antifreeze, effectively protecting metal equipment.
- Antifreeze Corrosion Inhibitor
- Metal Protection
Fermentation Industry
A phosphorus-potassium regulator in fermentation industries, used for microbial and fungal cultivation.
- Phosphorus-Potassium Regulator
- Microbial Culture
- Fungal Culture Medium
Pharmaceuticals and Culture Media
For use in the pharmaceutical industry (as a culture medium for penicillin, streptomycin) and as a nutrient for antibiotic culture media.
- Penicillin Culture Medium
- Streptomycin Culture Medium
- Antibiotic culture medium
- Nutrient Agent
Food Industry
Used in the food industry as a raw material for alkaline water in pasta products, fermentation agent, flavoring agent, leavening agent, mild alkaline agent for dairy products, yeast food.
- Pasta Alkaline Water
- Fermentation Agents
- Flavoring agent, leavening agent
- Dairy alkaline agent
- Yeast Food
- Milk Tea Powder Additive
- Feed Additives
Other Applications
High-quality raw material for various industrial applications.
- Talc Powder Iron Remover
- pH Adjusters
- Potassium Pyrophosphate Raw Material
- Store in a cool, dry, well-ventilated place, avoiding direct sunlight and damp environments.
- Avoid storage with strong acids, strong oxidizers, etc., to prevent chemical reactions.
- The product is hygroscopic; use promptly after opening and reseal any unused portion.
- Keep dry and avoid rain during transportation; prevent packaging damage.
- It is recommended to wear protective gloves and a mask during use to avoid direct skin contact and inhalation of dust.
- May undergo autolysis at higher temperatures; dehydrates internally at 204°C to form potassium pyrophosphate.
FAQ
Both are important phosphorus-potassium fertilizers, with the main differences being:
- Different Chemical FormulasDKP is K₂HPO₄ (Potassium Phosphate Dibasic), and MKP is KH₂PO₄ (Potassium Phosphate Monobasic).
- Different pH LevelsDKP aqueous solution is slightly alkaline (pH about 9), while MKP aqueous solution is acidic (pH about 4.5-5).
- Nutrient Content VariesDKP has a higher K₂O content (about 53%), while MKP has a higher P₂O₅ content (about 52%).
Each has its own characteristics:
- Nutrient ConcentrationThe anhydrous form has higher nutrient concentration (P₂O₅≥40%, K₂O≥53%), while the trihydrate is relatively lower (P₂O₅≥30.5%, K₂O≥40.5%).
- StabilityThe anhydrous form is more stable and less prone to caking; the trihydrate is relatively more hygroscopic.
- PriceTrihydrate has lower production costs and is relatively affordable.
The main differences lie in impurity content standards and application fields:
- Impurity LimitsFood grade has stricter requirements for impurities such as arsenic, lead, and heavy metals (e.g., As≤0.0003%, Pb≤0.0002%).
- Implementation StandardFood grade complies with GB25561-2010, industrial grade complies with HG/T4510-2013.
- Application AreasFood grade is used in food processing, pharmaceutical culture, etc.; industrial grade is used in water-soluble fertilizer production, industrial water treatment, etc.
Thermal stability characteristics of dipotassium phosphate:
- HygroscopicityThe product is hygroscopic and may cake in high-temperature, humid environments.
- AutolysisMay undergo autolysis at higher temperatures.
- Molecular DehydrationAt 204°C, it dehydrates internally to form potassium pyrophosphate (TKPP).
- Storage RecommendationsStore in a cool, dry place, avoiding high-temperature environments.
Our dipotassium hydrogen phosphate products support multiple packaging specifications:
- 25 kg/bagInner plastic bag, outer woven sack, suitable for small to medium batch purchases.
- 50 kg/bagInner plastic bag, outer woven sack, suitable for general procurement needs.
- 1000 kg/bag (ton bag)Suitable for bulk purchasing, lower cost
Packaging: Inner plastic bag, outer woven bag. Store in a ventilated, dry place.
Send Inquiry
Please fill in the following information, and our business team willWithin 2 Business DaysReply to You.
Same Series Products
More phosphorus-potassium water-soluble fertilizer products to meet the needs of different crops and fertilization.
