Phthalic Anhydride

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phthalic anhydride

[′thal·ik an′hī‚drīd]
(organic chemistry)
C6H4(CO)2O White crystals, melting at 131°C; sublimes when heated; slightly soluble in ether and hot water, soluble in alcohol; used to make dyes, resins, plasticizers, and insect repellents.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Phthalic Anhydride


(also acid phthalic anhydride), a colorless crystalline compound, with a melting point of 130.8°C and a boiling point of 284.5°C. It is practically insoluble in water and moderately soluble in organic solvents.

Phthalic anhydride is an important starting product in the manufacture of various phthalic-acid derivatives, including esters, phthalimide, and phthalonitrile. The condensation of phthalic anhydride with phenols is used to obtain dyes, such as phenolphthalein. Much of the phthalic anhydride produced is used in the manufacture of glyptal, penta resins, intermediate products, dyes—derivatives of fluorescein, rhodamine, and anthra-quinone—and drugs, such as the anticoagulants Ftalazol (phthalylsulfathiazole) and Fenilin (phenindione).

Phthalic anhydride is prepared by the catalytic oxidation of naphthalene or ortho-xylene by air in the gaseous phase.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The scanned photographs of various paint coats (with varying percentages of pigment loading) consisting of dispersing agents based on multifunctional isocyanate adducts, hydroxyesters (PEG-1000 + phthalic or tetrachloro phthalic anhydride), epoxy white and PU metal coat binder resins were examined for damage after exposure to salt spray at different time intervals.
Recently, a trade magazine predicted that Koppers will produce about 25% of America's phthalic anhydride by the middle of 1970.
[ClickPress, Thu Apr 11 2019] Adroit Market Research launched a study titled, "Global Phthalic Anhydride Market Size 2017 By Derivatives (Phthalate Plasticizers, Unsaturated Polyester Resins (UPRs), Alkyd Resins and Others), By Region and Forecast 2018 to 2025".
[USPRwire, Wed Apr 13 2016] GlobalData's new report, "Phthalic Anhydride Industry Outlook in Italy to 2019 - Market Size, Company Share, Price Trends, Capacity Forecasts of All Active and Planned Plants", provides in-depth coverage of Italy's Phthalic Anhydride industry and presents major market trends.
San Francisco, CA, July 16, 2014 --( The global market for phthalic anhydride is expected to reach USD 10,387.5 million by 2020, according to a new study by Grand View Research, Inc.
The modified ESO-DGEBA systems using phthalic anhydride was studied using DMA.
The twinkling fractal theory and the Clausius--Mossotti equation were used to guide two approaches of synthesis to improve the properties of the biobased thermosets: The biobased resin acrylated epoxidized soybean oil (AESO) was either crosslinked with divinylbenzene (DVB) or chemically modified by phthalic anhydride. The DVB-crosslinked resins had a 14-24[degrees]C increase in their glass-transition temperatures ([T.sub.g] s), which was dependent on the crosslink densities.
For example, there have been several reports of shortages of epoxy resins, various grades of PVC, several plasticizers, titanium dioxide, acrylic acid and butyl acrylic, phthalic anhydride, China clay, raw wood oil, plastic packaging materials, and even tin plate, among others--all materials that are used in paint manufacture.
Ke said his company will set up a DOP (dioctyl phthalate) plant and a PA (phthalic anhydride) plant in Chengdu of Sichuan province as the China-based China Petroleum and Chemical Corp.
The Eterindo Group constitutes a group of companies operating an integrated industry, with products including Phthalic Anhydride, Plasticizers, Unsaturated Polyester Resins, Alkyd/Amino Resins and Synthetic Latex Resins.
The modified elastomer must have a functional group that can interact with a carbonyl group such as maleic anhydride, phthalic anhydride, acrylic acid, maleic acid, itaconic acid, epoxy, or a glycidyl group.
Table 1: Silicone-alkyd formulation with high ratio of anhydride: polyol Ingredients Parts Dehydrated castor oil fatty acid 788.7 Pentaerythritol 367.1 Phthalic anhydride 451.3 Silicone intermediate 850.2 Molar ratio anhydride: polycl 1.14 Table 2: Silicone-alkyd formulation with low ratio of anhydride: polyol Ingredients Parts Dehydrated castor oil fatty acid 886.0 Pentaerythritol 15.9 Trimethylolethane 398.4 Phathalic anhydride 432.3 Silicone intermediate 789.5 Trimellitic anhydride 128.6 Molar ratio anhydride:polyol 0.85