Terephthalaldehyde CAS 623-27-8, Terephthalaldehyde, CAS 623-27-8
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Acidity and reaction: Dicarboxylic acid, which can form anhydride (phthalic anhydride, CAS 85-44-9), dehydrates to form anhydride when heated above 200°C.
623-27-8
C8H6O2
134.13
210-784-8
| CAS | 623-27-8 |
| Molecular formula | C8H6O2 |
| Molecular weight | 134.13 |
| EIENCS | 210-784-8 |
| Form | Crystalline Powder |
| Melting point | 114-116 °C (lit.) |
| boling point | 245-248 °C (lit.) |
| Density | 1,06 g/cm3 |
| Solubility | 3g/l |
| PKA | / |
| Color | White to light yellow |
| Storage temp |
Chemical labeling
Molecular formula: C₈H₆O₄
Molecular weight: 166.13 g/mol
Alternative names: Phthalic acid, phthalic acid, 1, 2-phthalic acid
Appearance: White crystalline powder or needle-like crystals, odorless or slightly sour.
Melting point: 191-200°C (decomposition)
Density: 1.59 g/cm³ (20°C)
Solubility
Readily soluble in hot water, methanol and ethanol;
Slightly soluble in cold water and ether;
It is almost insoluble in benzene and petroleum ether.
Chemical properties
Acidity and reaction: Dicarboxylic acid, which can form anhydride (phthalic anhydride, CAS 85-44-9), dehydrates to form anhydride when heated above 200°C.
Stability: Stable at room temperature, but decomposes upon high heat, releasing irritating smoke 🔥.
Synthesis of plasticizers
It is used in the production of phthalate ester plasticizers (such as DOP, DBP), accounting for over 70% of global consumption, and is applied in PVC plastics and rubber products.
Resins and Coatings
Synthetic alkyd resins and polyester resins are used in paints, coatings and adhesives.
Dyes and pharmaceutical intermediates
Production of anthraquinone dyes, fluorescent brighteners and drug synthesis (such as the antimalarial drug chloroquine).
Analytical reagent
It is used as a pH indicator or complexometric titrant in chemical analysis.
Health hazard
Toxicity: Low toxicity (oral LD₅₀ in rats ≈ 12,200 mg/kg), but irritating to the skin, eyes and respiratory tract, and may cause contact dermatitis.
Exposure risk: Dust masks, goggles and acid-resistant gloves must be worn during operation.
Environmental risk
Toxic to aquatic organisms (Acute Hazard Category 2), prevention of entry into water bodies is required.
Storage and Operation
Storage: Keep in a sealed, light-proof container in a cool and dry place (≤30°C), away from oxidants, alkalis and heat sources.
Emergency response:
Skin contact: Rinse immediately with soapy water;
Inhalation: Move to a place with fresh air and inhale oxygen if necessary.
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