To use all functions of this page, please activate cookies in your browser.
my.chemeurope.com
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Phthalic acid
Phthalic acid (IUPAC systematic name: benzene-1,2-dicarboxylic acid) is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. It is an isomer of isophthalic acid and terephthalic acid. Additional recommended knowledge
UsesPhthalic acid is used mainly in the form of the anhydride to produce other chemicals such as dyes, perfumes, saccharin, phthalates and many others. HistoryPhthalic acid was obtained by French chemist Auguste Laurent in 1836 by oxidizing naphthalene tetrachloride, and, believing the resulting substance to be a naphthalene derivative, he named it naphthalenic acid. Swiss chemist Jean Charles Galissard de Marignac determined its formula and showed Laurent’s supposition to be incorrect, upon which Laurent gave it its present name. Manufacturing methods in the nineteenth century included oxidation of naphthalene tetrachloride (prepared from naphthalene, potassium chlorate and hydrochloric acid) with nitric acid, or, better, oxidation of the hydrocarbon with fuming sulfuric acid, using mercury or mercury(II) sulfate as a catalyst. The catalytic oxidation of naphtalene directly to phthalic anhydride and a subsequent hydrolysis of the anhydride is one of the new production methods. ChemistryIt forms white crystals, melting at 210 °C with decomposition into water and phthalic anhydride. Heating with an excess of lime produces benzene. The acid (and anhydride) are largely used in the color industry (see phenolphthalein). See alsoReferencesNone. This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain. Categories: Dicarboxylic acids | Benzoic acids | Phthalates |
|||||||||||||||||||||||||||||||||||||||||||||
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phthalic_acid". A list of authors is available in Wikipedia. |