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Technical Specifications
Basic Information
| Project | Parameters |
|---|---|
| Product Name | Monopotassium Phosphate |
| English Name | Monopotassium Phosphate (MKP) |
| CAS Number | 7778-77-0 |
| Chemical Formula | KH2PO4 |
| Molecular Weight | 136.09 |
| Appearance | White or colorless crystals |
| Relative Density | 2.338 |
| Melting point | 252.6℃ |
Physicochemical Properties
| Project | Description |
|---|---|
| Appearance | White or colorless crystals |
| Water Solubility | Soluble in Water |
| Relative Density | 2.338 |
| Melting point | 252.6℃ |
| pH Value (1% Aqueous Solution) | 2 — 4.7, acidic |
Technical Specifications — Industrial Grade (HG/T4511-2013)
| Serial Number | Specification Name | Requirement |
|---|---|---|
| 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 matter % ≤ | 0.1 |
| 7 | Chloride (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 | Specification Name | Requirement |
|---|---|---|
| 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 matter % ≤ | 0.2 |
| 7 | Chloride (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 & Storage
| Project | Description |
|---|---|
| Packaging Method | Inner Plastic Outer Woven |
| Packaging Specifications | 25 kg/bag, 50 kg/bag, 1000 kg/bag (ton bag) |
| Storage Conditions | Store in a Well-Ventilated, Dry Place |
| Shelf Life | 24 months (under sealed storage conditions) |
Product Introduction
Product Overview
Monopotassium Phosphate (MKP), CAS No. 7778-77-0, chemical formula KH₂PO₄, molecular weight 136.09. Appearance: white or colorless crystals, easily soluble in water, relative density 2.338, melting point 252.6°C.
Physicochemical Properties
- AppearanceWhite or colorless crystals
- Water SolubilitySoluble in Water
- Relative Density: 2.338
- Melting point: 252.6℃
- pH value1% aqueous solution pH 4.2-4.7, acidic
Specifications & Standards
| Grade | Implementation Standards | Main Applications |
|---|---|---|
| Industrial grade | HG/T4511-2013 | Agricultural Fertilizer, Chemical Raw Material |
| Food Grade | GB 25560-2010 | Pharmaceutical Manufacturing, Food Processing |
Nutrient Specifications
Application Reference
Agricultural Production
Used as a high-efficiency compound fertilizer, with a total nutrient (K₂O+P₂O₅) of 86%, making it a high-quality base material for formulating N, P, K ternary compound fertilizers.
- Raw Materials for NPK Compound Fertilizer
- High-Efficiency Water-Soluble Fertilizer Formulation
- Foliar Spray Fertilizer
- For Drip Irrigation and Fertigation
- Chlorine-Free Potash Supply
Pharmaceutical Industry
Used in pharmaceutical manufacturing, it is an important pharmaceutical intermediate.
- Pharmaceutical Intermediates
- Antibiotic Culture Media
- Nutritional Supplements
- Phosphorus-Potassium Adjuster
Food Industry
Food grade products are used in various food processing stages, complying with the GB 25560-2010 standard.
- Food Additive
- Fermentation Industry
- Nutritional Fortifier
- pH Adjuster
Chemical Raw Materials
Used in the production of products such as metaphosphates.
- Metaphosphate Manufacturing
- Flame Retardant Materials
- Surface Treatment Agent
- Store in a cool, dry, well-ventilated place, avoiding direct sunlight and damp environments.
- The product is easily soluble in water, and the resulting solution is acidic; please note this during application.
- Avoid direct mixing with alkaline substances (such as lime, sodium hydroxide, etc.) to prevent reactions.
- Keep dry and protected from rain during transport; avoid packaging damage.
- It is recommended to wear protective gloves and a mask during use to avoid direct skin contact and inhalation of dust.
Frequently Asked Questions
Both are important phosphate fertilizer products, with the main differences being:
- Different Chemical FormulasMKP is KH₂PO₄ (Monopotassium Phosphate), MAP is NH₄H₂PO₄ (Monoammonium Phosphate)
- Varies in Nutrient CompositionMKP provides phosphorus and potassium, while MAP provides phosphorus and nitrogen.
- Nutrient ContentMKP total nutrient 86% (P₂O₅≥52%+K₂O≥34%), MAP approx. 73-75%
- Different pH ValuesMKP aqueous solution is acidic (pH approx. 4.2-4.7), MAP aqueous solution is also acidic
Potassium dihydrogen phosphate is a typical chlorine-free phosphorus-potassium fertilizer:
- Chloride-freeThe chemical formula of MKP contains only potassium, phosphorus, hydrogen, and oxygen, with no chloride ions.
- Chlorine-Sensitive Crop FriendlyCrops such as tobacco, tea, grapes, potatoes, and sugarcane are chlorine-sensitive; excessive chlorine can affect quality
- Chlorine-Free Potassium SourceAn ideal substitute for potassium chloride, especially suitable for high-economic-value crops
- Improve QualityUsing MKP can improve tobacco combustibility, tea quality, and grape sugar content, etc.
The acidic nature of potassium dihydrogen phosphate aqueous solution is its chemical characteristic.
- Cause of AcidityKH₂PO₄ dissociates into K⁺ and H₂PO₄⁻ in water, and H₂PO₄⁻ further hydrolyzes to produce H⁺
- pH Range1% aqueous solution pH value 4.2-4.7
- Usage InstructionsAvoid direct mixing with cationic fertilizers containing calcium, magnesium, etc., to prevent precipitation
The main differences lie in impurity content standards and application fields.
- Impurity LimitsFood-grade products have stricter requirements for impurities such as arsenic, lead, and heavy metals.
- Moisture RequirementsFood grade moisture ≤0.2%, which is stricter than industrial grade (≤0.5%).
- Implementation StandardsFood grade complies with GB 25560-2010, industrial grade complies with HG/T4511-2013
- Application FieldsFood grade for food processing, pharmaceutical manufacturing, etc.; Industrial grade for agriculture, industry, etc.
Our monopotassium phosphate products support multiple packaging specifications.
- 25 kg/bagInner plastic liner, outer woven bag, suitable for small to medium batch purchases
- 50 kg/bagInner plastic liner, outer woven bag, suitable for general procurement needs
- 1000 kg/bag (ton bag)Suitable for bulk purchasing, lower cost
Packaging: Plastic inner bag, woven outer bag. Store in a ventilated, dry place.
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