Phthalic acid

Phthalic acid is an aromatic dicarboxylic acid with the molecular formula C8H6O4 and CAS number 88-99-3. This organic compound consists of a benzene ring with two carboxylic acid groups attached in ortho position. With a molecular weight of 166.13 g/mol, phthalic acid serves as an important industrial intermediate in chemical manufacturing. It appears as white crystalline solid and is widely used in the production of plasticizers, resins, and dyes.

Phthalic acid is a white crystalline solid at room temperature with no distinctive odor. It has a molecular weight of 166.13 g/mol and demonstrates moderate solubility in water, with increased solubility at elevated temperatures. The compound is more readily soluble in alcohols and other polar organic solvents. It exhibits typical carboxylic acid behavior, forming salts with bases and esters with alcohols under appropriate conditions.

Phthalic acid is primarily used as a precursor in the manufacture of phthalic anhydride, which is essential for producing plasticizers, particularly for PVC applications. It serves as an intermediate in synthesizing polyester resins, alkyd resins used in paints and coatings, and various dyes and pigments. The compound also finds applications in the pharmaceutical industry as a building block for certain medications and in the production of specialty chemicals.

Phthalic acid should be handled with standard laboratory safety precautions including wearing appropriate personal protective equipment such as safety glasses, gloves, and lab coats. Work in well-ventilated areas to avoid dust inhalation and prevent skin contact. Although not classified with specific hazard pictogrammes, avoid creating dust clouds and ensure proper hygiene practices. Use appropriate tools for handling to minimize direct contact and maintain clean work surfaces.

Phthalic acid should be stored in a cool, dry place away from moisture and heat sources to prevent degradation. Keep containers tightly sealed to avoid contamination and moisture absorption. Store away from strong bases and reducing agents which may react with the carboxylic acid groups. Ensure storage areas have adequate ventilation and maintain temperatures below 25°C when possible. Use original containers or suitable chemical-resistant containers for storage.

In case of skin contact with phthalic acid, immediately wash the affected area with plenty of water and soap for at least 15 minutes. If eye contact occurs, rinse thoroughly with clean water for several minutes and remove contact lenses if present. If inhaled, move to fresh air immediately. For ingestion, rinse mouth with water and seek medical advice. Although generally low in toxicity, consult medical professionals if irritation persists.

Phthalic acid waste must be disposed of according to local and national environmental regulations as chemical waste. Do not dispose of it down drains or in regular household waste. Collect waste in appropriate containers and label clearly for professional waste disposal services. Small quantities may be neutralized with sodium bicarbonate solution before disposal, but larger amounts require specialized chemical waste treatment. Consult local waste management authorities for specific disposal requirements.

Phthalic acid is generally not classified as dangerous goods under ADR regulations for road transport, making it relatively straightforward to ship. Standard packaging requirements apply, using appropriate containers that prevent spillage and contamination. Ensure packages are properly labeled with substance identification and supplier information. Follow general chemical transport guidelines including proper documentation and handling instructions. Consult transport regulations for specific packaging and documentation requirements.

Phthalic acid is subject to standard chemical regulations under REACH and CLP in Europe, requiring registration for commercial use above certain tonnages. It is not classified as an SVHC (Substance of Very High Concern) and does not carry specific hazard classifications. Standard chemical safety data sheet requirements apply for commercial transactions. Users must comply with workplace safety regulations and environmental protection measures according to local legislation.

Phthalic acid is available through OYSI, a specialized European distributor of technical chemicals serving industrial and professional customers across Europe. OYSI provides reliable supply chains and technical support for chemical procurement needs. The compound is also available through other chemical suppliers and distributors specializing in industrial chemicals. When purchasing, ensure suppliers provide proper documentation including safety data sheets and certificates of analysis for quality assurance.