- CAS No.: 85-44-9
- Other Names: PA
- MF: C8H4O3
- EINECS No.: 85-44-9
- Purity: 99.5%, 99.8%
- Appearance: White Powder or Scale-like Solid or Needle-like Solid
- Product name: Phthalic Anhydride
- H.S. CODE: 29173500
- Odour: A Little
- Solubility: Easily Soluble in Hot Water
- Density: 53g/cm3
- Flashing Point: 152℃
- Molecular Weight: 148.11
- Boiling Point: 284℃
- Safety Description: 23-24/25-26-37/39-46-22
- Danger Description: 22-37/38-41-42/43
- Product Description
Phthalic anhydride is one of our company’s star products and if appropriately enough that you just want to buy it, please tell me. I will help you to choose the phthalic anhydride which is attractive in price and quality.Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. It was the first anhydride of a dicarboxylic acid to be used commercially. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2000, the worldwide production volume was estimated to be about 3 million tonnes per year.
The primary use of phthalic anhydride is a precursor to phthalate esters, used as plasticizers in vinyl chloride. Phthalate esters are derived from phthalic anhydride by the alcoholysis reaction. In the 1980s, approximately 6.5*109kg of these esters were produced annually, and the scale of production was increasing each year, all from phthalic anhydride.
Precursor to dyestuffs
Phthalic anhydride is widely used in industry for the production of certain dyes. A well-known application of this reactivity is the preparation of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by hydrolysis of the chloride. Phenolphthalein can be synthesized by the condensation of phthalic anhydride with two equivalents of phenol under acidic conditions.
Pharmaceuticals
Phthalic anhydride treated with cellulose acetate gives cellulose acetate phthalate, a common enteric coating excipient that has also been shown to have antiviral activity. Phthalic anhydride is a degradation product of CAP.