Phthalic Acid
Request a quote| Catalog Number | ACM88993-1 |
| CAS | 88-99-3 |
| Structure | ![{[CurrentData.Name]}](https://resource.alfa-chemistry.com/structure/88-99-3.gif) |
| Description | Phthalic acid is an aromatic dicarboxylic acid, with formula C6H4(CO2H)2. It is an isomer of isophthalic acid and terephthalic acid. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. |
| IUPAC Name | Phthalic acid |
| Synonyms | 1,2-Benzenedicarboxylic acid; |
| Molecular Weight | 166.13 |
| Molecular Formula | C8H6O4 |
| Canonical SMILES | C1=CC=C(C(=C1)C(=O)O)C(=O)O |
| Inchi | InChI=1S/C8H6O4/c9-7(10)5-3-1-2-4-6(5)8(11)12/h1-4H,(H,9,10)(H,11,12) |
| InChIKey | XNGIFLGASWRNHJ-UHFFFAOYSA-N |
| Boiling Point | 214.32 °C |
| Melting Point | 200-205ºC |
| Flash Point | 168ºC |
| Purity | 99% |
| Density | 1.451 g/cm³ |
| Solubility | less than 1 mg/mL at 68° F (NTP, 1992);0.04 M;Soluble in alcohol; sparingly soluble in ether;1 g dissolves in 160 ml water, 10 ml alc, 205 ml ether, 5.3 ml methanol; practically insol in chloroform;In water, 6,965 mg/L at 25 °C;7.01 mg/mL at 25 °C;Solubility in water, g/100ml at 25 °C: 0.625 (poor) |
| Appearance | White crystals |
| Application | Phthalic acid serves as a crucial chemical compound in various industrial applications, primarily known for its role as a precursor to phthalic anhydride. This aromatic dicarboxylic acid, characterized by its colorless crystalline form and chemical formula C6H4(COOH)2, consists of two carboxyl groups attached to adjacent carbon atoms in its benzene ring, earning it the technical name benzene-1,2-dicarboxylic acid. While phthalic acid itself has limited commercial use, its derivative, phthalic anhydride, is widely utilized in the production of plasticizers and polyester resins, stemming from its catalytic oxidation process involving naphthalene. Additionally, phthalic acid has applications in analytical chemistry, particularly through its mono potassium salt, potassium hydrogen phthalate, which serves as a standard acid. Its solubility characteristics include being slightly soluble in water, more soluble in alcohol, and somewhat soluble in ether, with specific melting points and physical properties differentiating its forms. |
| Storage | Store under inert gas |
| Refractive Index | 1.5100 (estimate) |
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