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phthalic acid to phthalic anhydride

phthalic acid to phthalic anhydride

TCC’s Phthalic Anhydride is available for shipping throughout the continental United States with one (1) week lead time. 5.2.). It reacts with strong oxidants and responds violently when heated with copper oxide or sodium nitrite, to cause an explosion hazard. The product gives a pink colour with alkali. Phenol is heated with phthalic anhydride in presence of conc. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. Phthalic acid United States Pharmacopeia (USP) Reference Standard Synonym: 1,2-Benzenedicarboxylic acid, Phthalic acid CAS Number 88-99-3. Add the zinc chloride in small portions, with stirring by means of a thermometer, to the mixture i… Place a round bottom flask filled with water on top of the beaker and increase the temperature to dehydrate the phthalic acid to phthalic anhydride. Phthalic Anhydride (a.k.a. The zinc chloride should not be exposed to the air. Phthalic anhydride is a principal commercial form of phthalic acid. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. See more. Phthalate esters that function as plasticizers are derived from phthalic anhydride. Other reactions with phthalic anhydride yield phenolphthalein, benzoic acid, Phthalic anhydride, rather than the acid itself, is a compound of considerable importance. Click here for information on selection of N, R, or P filters. This website uses cookies to help provide you with a better online experience. In 2000, the worldwide production volume was estimated to be about 3 million tonnes per year. & Ind. It is an isomer of isophthalic acid and terephthalic acid. It is used as an indicator of acid-base titration. Add water (about 50 ml) to disintegrate the solid. Phthalic anhydride. 1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Because both these methods convert the collected phthalic anhydride to, and analyze as, phthalic acid, they are susceptible to positive interference from any phthalic acid originally present in the air. Others have collected phthalic anhydride on glass fiber filters and extracted with dilute aqueous sodium hydroxide (Ref. 2. Click here for information on selection of N, R, or P filters.*/. Beilstein/REAXYS Number 118515 . Principal markets are construction, marine and transportation. Important additional information about respirator selection, 1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride. Click here for information on selection of N, R, or P filters. NACRES NA.21 Saving Lives, Protecting People, The National Institute for Occupational Safety and Health (NIOSH), National Institute for Occupational Safety and Health, A – NIOSH Potential Occupational Carcinogens, B – Thirteen OSHA-Regulated Carcinogens, D – Substances with No Established RELs, E – OSHA Respirator Requirements for Selected Chemicals, G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect, Type C & CE – Definitions for Type C and Type CE Respirators, U.S. Department of Health & Human Services. Undergoes exothmeric nitration with fuming nitric acid-sulfuric acid and may give mixtures of the potentially explosive phthaloyl nitrates or nitrites or their nitro derivatives [Chem. Acid anhydrides are used in a variety of chemical processes but particularly in epoxy resins. *, Up to 60 mg/m3: (APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. MDL number MFCD00005918. The para isomer, terephthalic acid, is also used to make polymers—namely, polyesters (see below Derivatives of carboxylic acids: Carboxylic esters). 1972]. Phthalic anhydride is the organic compound with the formula :-C6H4(CO)2O. Phthalic anhydride is the anhydride of phthalic acid. It is slightly soluble in hot water, hydrolysing to Phthalic Acid. Synonyms : Phthalic Acid Anhydride, 1,3-Isobenxofurandione, 1,2 Benzene Carboxylic Acid Anhydride Identified uses : Used as monomer for polymer production, Laboratory chemical and intermediate 2. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. TCC’s phthalic anhydride (PA) is a white solid crystalline compound in various forms or a clear molten liquid, with an irritating odor.

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