Potassium phthalate

Core Chemical Properties

1. Stability: Stable at room temperature and normal pressure, non-flammable, non-explosive; decomposes at high temperature (>300℃) to produce potassium carbonate and aromatic compounds.
2. Reactivity: Reacts with strong acids (e.g., sulfuric acid, hydrochloric acid) to generate phthalic acid; forms complex compounds with some metal ions (e.g., Ca²⁺, Mg²⁺).
3. Solubility Characteristic: Aqueous solution is clear and transparent, no precipitation; solubility increases slightly with temperature rise (20℃: ~80g/100mL water).

4. Hygroscopy: Slightly absorbs moisture in humid air, no obvious caking, easy to store and handle.

Main Applications

1. Analytical Chemistry (Core Application for Reagent Grade)

• Primary Standard Reagent: Dipotassium phthalate is a certified primary standard for acid-base titration, used to calibrate strong base standard solutions (e.g., NaOH, KOH) with high accuracy and good reproducibility.
• Buffer Solution Preparation: Prepares neutral/weakly alkaline buffer solutions (pH 4.0-10.0) for chemical analysis, environmental detection and biological experiment.
• pH Calibration: Used as a reference material for pH meter calibration in laboratory and industrial detection.

2. Industrial Synthesis & Manufacturing

• Organic Intermediate: Raw material for the production of phthalate esters, plasticizers, polyester resins and aromatic organic compounds; intermediate for pharmaceutical and pesticide synthesis (e.g., anti-inflammatory drugs, herbicides).
• Coating & Ink Additive: Serves as a dispersant, emulsifier and pH regulator in water-based coatings and inks, improves dispersion stability of pigments/fillers and film-forming performance of coatings.
• Plastic & Rubber Auxiliary: Acts as a plasticizer and stabilizer for PVC, PE and rubber products, enhances flexibility and aging resistance of products; reduces thermal decomposition of plastics during processing.

3. Textile & Dyeing Industry

• Dye Fixing Agent: Improves the color fastness of reactive dyes, direct dyes on cotton, linen and polyester fabrics; acts as a pH regulator in dyeing bath to optimize dyeing conditions.
• Textile Finishing Agent: Enhances the softness and wrinkle resistance of textiles, and improves the hydrophilicity of synthetic fiber fabrics.

4. Other Fields

• Water Treatment Agent: Used as a scale inhibitor and corrosion inhibitor in industrial circulating water treatment, forms a protective film on metal surfaces to prevent pipeline scaling and corrosion.
• Cosmetic Additive: (Food/Cosmetic Grade) Serves as a pH regulator and humectant in mild cosmetics (e.g., facial cleanser, lotion), meets cosmetic safety standards.
• Laboratory Culture Medium: Prepares microbial culture media for biological research, adjusts the pH of culture media and provides potassium nutrient.

Core Product Advantages

1. High Purity & Uniformity: Reagent grade with ultra-high purity (≥99.8%) for accurate analytical experiments; industrial grade with stable component, no impurity interference for industrial production.
2. Stable Performance: No decomposition under normal storage and use conditions, consistent chemical reactivity, ensures stable production and experimental results.
3. Excellent Solubility: Highly soluble in water, forms clear solution, easy to prepare and use in all application scenarios.
4. Multi-Grade Customization: Reagent grade (AR/GR/CP), industrial grade and food/cosmetic grade available, fully meeting the needs of laboratory, industry and daily chemical fields.
5. Low Environmental Impact: Biodegradable in natural environment, no toxic and harmful by-products; non-corrosive, non-irritating (low concentration), safe for operation and use.

Storage & Handling Notes

1. Storage Conditions: Store in a dry, cool, well-ventilated closed warehouse; avoid rain, moisture, direct sunlight and high temperature (>50℃); separate from strong acids, oxidants and organic solvents.
2. Packaging Requirement: Sealed in plastic composite bags, kraft paper drums or HDPE drums (25kg/50kg standard package); food/cosmetic grade uses food-grade packaging materials to avoid contamination.
3. Operation Safety: Wear protective gloves, dust mask and goggles during handling; avoid direct contact with eyes and skin, and inhalation of dust; rinse with plenty of clean water immediately if splashed into eyes/on skin.
4. Transportation Rules: Transport as non-hazardous fine chemical products; use covered vehicles, avoid rain, snow and moisture; light loading and unloading to prevent package damage and powder leakage.
5. Shelf Life: 36 months for reagent grade, 24 months for industrial grade under sealed and dry storage conditions; expired products need to be rechecked for purity before use.
6. Waste Disposal: Unused products and waste residues shall be treated in accordance with local environmental protection regulations; do not discharge directly into water bodies or soil.

Industrial Classification & Attribute

Potassium Phthalate (mainly dipotassium phthalate) is a typical fine organic chemical product, classified into analytical reagents and industrial organic intermediates according to application. It is mainly produced by the neutralization reaction of phthalic anhydride and potassium hydroxide/potassium carbonate, with mature industrial synthesis technology and strict quality control. As a key raw material in analytical chemistry and industrial manufacturing, it is widely used in chemical, pharmaceutical, coating, textile and environmental protection industries, with important industrial and scientific research value.

Common Customized Types (for Export/ Specific Scenarios)

1. Potassium Phthalate AR Grade (99.5%, analytical reagent, laboratory use)
2. Potassium Phthalate GR Grade (99.8%, guaranteed reagent, precision analysis/calibration)
3. Industrial Grade Dipotassium Phthalate (98.0%, industrial synthesis/intermediate)
4. Food/Cosmetic Grade Potassium Phthalate (99.0%, pH regulator/additive, food/cosmetic safety standard)
5. Potassium Phthalate Crystal Form (large crystals, for high-precision experimental use)
6. Customized Packaging (1kg/5kg small package for laboratory; 25kg/50kg standard package for industrial/export)

Key Industry Term Explanation

• Dipotassium Phthalate: The mainstream commercial type of potassium phthalate, with higher stability and solubility than monopotassium phthalate, widely used in all fields.
• Primary Standard Reagent: A chemical reagent with high purity, stable properties, accurate composition and no need for calibration by other reagents, used for calibrating standard solutions.
• Phthalic Anhydride: The core raw material for producing potassium phthalate, reacted with potassium hydroxide to form potassium phthalate via hydrolysis and neutralization.