85-44-9

CAS Nr.:

85-44-9

Phthalic anhydride

EINECS Name:

Phthalic anhydride

201-607-5

EINECS Nr.:

201-607-5

Phthalsäureanhydrid (PSA) / Phthalic anhydride / 2-Benzofuran-1,3-dion / 1,2-Benzenedicarboxylic acid anhydride / 1,2-Benzenedicarboxylic anhydride / 1,3-Dioxophthalan / 1,3-Isobenzofuranidone / 1,3 Phthalandione / 1,3-dihydro-1,3-dioxoisobenzofuran / Phthalandione / Phthalic acid anhydride

Synonym:

Phthalsäureanhydrid (PSA) / Phthalic anhydride / 2-Benzofuran-1,3-dion / 1,2-Benzenedicarboxylic acid anhydride / 1,2-Benzenedicarboxylic anhydride / 1,3-Dioxophthalan / 1,3-Isobenzofuranidone / 1,3 Phthalandione / 1,3-dihydro-1,3-dioxoisobenzofuran / Phthalandione / Phthalic acid anhydride

Phthalic anhydride (PA), also known as 1,3-isobenzofurandione, is a significant chemical raw material that plays an essential role in numerous industrial processes. Due to its versatile properties, phthalic anhydride finds application across various industries, significantly contributing to the production of numerous products.

Physical Properties of Phthalic anhydride

Phthalic anhydride is a white to colorless solid with a characteristic pungent odor. It has a molar mass of 148.12 g/mol and a melting point of approximately 131 °C. The anhydride is soluble in organic solvents such as benzene, toluene, and chloroform, while its solubility in water is low. It readily reacts with water and alcohols to form the corresponding acids and esters.

Examples of applications of Phthalic anhydride

PA is a key starting material in the production of plastics, particularly in the manufacture of polyesters and alkyd resins. These materials find wide application in paints, coatings, and varnishes, where they are valued for their excellent mechanical properties and resistance to environmental influences.

Phthalic anhydride serves as a raw material for the production of phthalic dye stuffs, widely used in the textile and paper industries. These dyes are known for their vibrant colors and resistance to light and chemicals. Additionally, phthalic anhydride is also used in the manufacture of pigments for printing inks and coatings.

In the pharmaceutical industry, Phthalic anhydride is employed in the synthesis of active ingredients and intermediates. For example, it is used in the production of certain antibiotics and anti-inflammatory medications. Its reactive nature and ability to form various functional groups make it an important building block in pharmaceutical synthesis.

Phthalic anhydride is an extremely versatile and important chemical raw material with a wide range of applications. From plastic production to dye and pigment manufacturing, and pharmaceuticals – the outstanding properties of this compound make it an indispensable component of many industrial processes. Its versatility and efficient chemical properties ensure that phthalic anhydride remains a central raw material in modern industry.