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Technical specifications
Basic Information
| Position | Parameters |
|---|---|
| Product Name | Monopotassium Phosphate (MKP) |
| English name | Monopotassium Phosphate (MKP) |
| CAS No. | 7778-77-0 |
| Chemical Formula | KH2PO4 |
| Molecular weight | 136.09 |
| Appearance | White or Colorless Crystal |
| Relative density | 2.338 |
| Melting Point | 252.6℃ |
Physical and chemical properties
| Position | Description |
|---|---|
| Appearance | White or Colorless Crystal |
| Water soluble | Easily soluble in water |
| Relative density | 2.338 |
| Melting Point | 252.6℃ |
| pH (1% aqueous solution) | 4.2 — 4.7, acidic reaction |
Technical specifications – Industrial grade (HG/T4511-2013)
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Main content (as KH₂PO₄), % ≥ | 99 |
| 2 | Potassium oxide (K₂O) % ≥ | 34 |
| 3 | Phosphorus pentoxide (P₂O₅) % ≥ | 52 |
| 4 | pH of 1% aqueous solution | 4.3 — 4.7 |
| 5 | Moisture (H₂O) % ≤ | 0.5 |
| 6 | Water-insoluble substances % ≤ | 0.1 |
| 7 | Chlorides (as Cl) % ≤ | 0.05 |
| 8 | Arsenic (as As) % ≤ | 0.005 |
| 9 | Heavy metals (as Pb) % ≤ | 0.005 |
| 10 | Iron (as Fe) % ≤ | 0.003 |
Technical specifications — Food grade (GB 25560-2010)
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Main content (as KH₂PO₄), % ≥ | 99 |
| 2 | Potassium oxide (K₂O) % ≥ | 34 |
| 3 | Phosphorus pentoxide (P₂O₅) % ≥ | 52 |
| 4 | pH of 1% aqueous solution | 4.2 — 4.7 |
| 5 | Moisture (H₂O) % ≤ | 0.2 |
| 6 | Water-insoluble substances % ≤ | 0.2 |
| 7 | Chlorides (as Cl) % ≤ | 0.05 |
| 8 | Arsenic (as As) % ≤ | 0.0003 |
| 9 | Heavy metals (as Pb) % ≤ | 0.001 |
| 10 | Iron (as Fe) % ≤ | 0.003 |
| 11 | Fluoride (as F) % ≤ | 0.001 |
| 12 | Lead (as Pb) % ≤ | 0.0002 |
Packaging and Storage
| Position | Instruction |
|---|---|
| Packaging method | Inner plastic packaging, outer woven bag |
| Packaging Specification | 25 kg/bag, 50 kg/bag, 1000 kg/bag (big bag) |
| Storage Conditions | Store in a dry, well-ventilated place |
| Shelf Life | 24 months (when stored under sealed conditions) |
Product description
Product overview
Monopotassium phosphate (MKP), CAS 7778-77-0, chemical formula KH₂PO₄, molecular weight 136.09. Appearance: white or colorless crystal, readily soluble in water, relative density 2.338, melting point 252.6°C.
Physical and chemical properties
- AppearanceWhite or Colorless Crystal
- Water solubleEasily soluble in water
- Relative density: 2.338
- Melting Point: 252.6℃
- pH value1% aqueous solution: pH 4.2-4.7, acidic
Specification Standard
| Grade | Execution Standard | Main Application |
|---|---|---|
| Industrial Grade | HG/T4511-2013 | Agricultural fertilizers, chemical raw materials |
| Food Grade | GB 25560-2010 | Pharmaceutical production, food processing |
Nutrient Indicators
Application recommendations
Agricultural Production
Applied as a high-efficiency complex fertilizer; total nutrient content (K₂O+P₂O₅) reaches 86%. It is a quality basic raw material for preparing N, P, K compound fertilizers.
- Raw material for compound NPK fertilizers
- Preparation of high-efficiency water-soluble fertilizer
- Foliar fertilizer
- Application for drip irrigation and fertigation
- Supply of chlorine-free potassium fertilizers
Pharmaceutical industry
Used in pharmaceutical manufacturing as a key intermediate.
- Pharmaceutical intermediates
- Antibiotic nutrient medium
- Food additives
- Phosphorus-Potassium Regulator
Food industry
Food grade products are used at various stages of food processing and comply with standard GB 25560-2010.
- Food additive
- Fermentation industry
- Nutrient enhancer
- pH Regulator
Chemical Raw Material
Used for production of metaphosphates and other products.
- Metaphosphate production
- Flame retardants
- Surface Treatment
- Store in a cool, dry, well-ventilated place, avoiding direct sunlight and moist environment.
- The product dissolves easily in water; the solution is acidic; pay attention to compatibility when using.
- Avoid direct mixing with alkaline substances (e.g., lime, sodium hydroxide, etc.) to prevent reaction.
- During transport, protect from moisture and rain, avoid package damage.
- When using, it is recommended to wear protective gloves and a mask, avoiding direct skin contact and inhalation of dust.
Frequently asked questions
Both are important phosphorus fertilizers, the main difference lies in:
- Various chemical formulasMKP is KH₂PO₄ (monopotassium phosphate), MAP is NH₄H₂PO₄ (monoammonium phosphate).
- Various nutrient compositionsMKP provides phosphorus and potassium, MAP provides phosphorus and nitrogen.
- Nutrient contentTotal nutrient content MKP 86% (P₂O₅≥52%+K₂O≥34%), MAP about 73-75%
- Various pH valuesThe aqueous solution of MKP is acidic (pH approx. 4.2–4.7); the aqueous solution of MAP is also acidic.
Potassium dihydrogen phosphate is a typical chlorine-free phosphorus-potassium fertilizer:
- Chloride-ion freeThe chemical formula of MKP contains only potassium, phosphorus, hydrogen and oxygen, without any chloride ions.
- Safe for chlorine-sensitive cropsCrops such as tobacco, tea, grapes, potatoes, and sugarcane are sensitive to chlorine; excess chlorine may affect quality.
- Chlorine-free potassium sourceIt is an ideal alternative to potassium chloride, especially suitable for high-value agricultural crops.
- Quality improvementUsing MKP improves tobacco combustibility, tea quality, grape sugar content, etc.
The acidic reaction of potassium dihydrogen phosphate aqueous solution is its chemical characteristic:
- Causes of AcidityKH₂PO₄ dissociates in water into K⁺ and H₂PO₄⁻; H₂PO₄⁻ further hydrolyzes to form H⁺.
- pH rangepH of 1% aqueous solution: 4.2–4.7
- Safety PrecautionsDo not directly mix with cationic fertilizers such as calcium and magnesium to avoid precipitation.
The main difference lies in impurity content standards and application fields:
- Impurity LimitFood grade imposes stricter requirements on impurities such as arsenic, lead, and heavy metals.
- Moisture RequirementsFood-grade moisture content ≤0.2%, stricter than industrial grade (≤0.5%).
- Execution StandardFood grade conforms to GB 25560-2010, industrial grade conforms to HG/T4511-2013.
- Area of applicationFood grade is used in food processing, pharmaceutical production, etc.; industrial grade is used in agriculture, industry, etc.
Our monopotassium phosphate is available in various packaging options:
- 25 kg/bagInner plastic layer, outer woven bag — suitable for small and medium batch orders
- 50 kg/bagInner plastic layer, outer woven bag packaging — suitable for standard procurement needs.
- 1000 kg/bag (big bag)Suitable for bulk purchases, lower cost
Packaging: inner polyethylene bag, outer woven bag. Store in a dry, well-ventilated place.
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