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Phthalic anhydride Manufacturer/High quality/Best price/In stock
Cas No: 85-44-9
USD $ 3.0-3.0 / Kilogram 1 Kilogram 1-100 Metric Ton/Month Dayang Chem (Hangzhou) Co.,Ltd. Contact Supplier
o-Phthalic anhydride
Cas No: 85-44-9
USD $ 1.0-2.0 / Metric Ton 1 Metric Ton 100 Metric Ton/Week Hebei yanxi chemical co.,LTD. Contact Supplier
Amadis Chemical offer CAS#85-44-9;CAT#A841333
Cas No: 85-44-9
No Data 10 Milligram Amadis Chemical Co., Ltd. Contact Supplier
Hot sell high purity Phthalic anhydride CAS: 85-44-9
Cas No: 85-44-9
USD $ 30.0-50.0 / Gram 100 Gram 50000 Metric Ton/Month WUHAN MULEI NEW MATERIAL CO., LTD Contact Supplier
Phthalic anhydride
Cas No: 85-44-9
USD $ 1.0-1.0 / Kilogram 1 Kilogram 1000 Kilogram/Month Enke Pharma-tech Co.,Ltd. (Cangzhou, China ) Contact Supplier
Phthalic anhydride CAS: 85-44-9
Cas No: 85-44-9
USD $ 1.0-2.0 / Metric Ton 5 Metric Ton 1000 Metric Ton/Year Henan Sinotech Import&Export Corporation Contact Supplier
Factory Supply Phthalic anhydride cas 85-44-9
Cas No: 85-44-9
No Data 200 Gram 400 Metric Ton/Day Ality Chemical Corporation Contact Supplier
Phthalic anhydride
Cas No: 85-44-9
No Data 1 Kilogram 300 Metric Ton/Year Jinan Finer Chemical Co., Ltd Contact Supplier
85-44-9 Phthalic anhydride
Cas No: 85-44-9
USD $ 500.0-500.0 / Kilogram 1 Kilogram 100 Metric Ton/Day Henan Tianfu Chemical Co., Ltd. Contact Supplier
phthalic anhydride/99%
Cas No: 85-44-9
No Data 1 Kilogram 1000 Metric Ton/Month Changzhou Xuanming Chemical Co., Ltd. Contact Supplier

85-44-9 Usage


Phthalic Anhydride is an organic compound and the anhydride of phthalic acid (P384480). Phthalic Anhydride is an important industrial chemical commonly used in large-scale production of plasticizers f or plastics. Recent research have also evaluated Phthalic Anhydride as potential antibacterial agent.

Chemical Properties

white crystalline solid with choking odour

General Description

A colorless to white lustrous solid in the form of needles with a mild distinctive odor. Moderately toxic by inhalation or ingestion and a skin irritant. Melting point 64°F Flash point 305°F. Forms a corrosive solution when mixed with water. Used in the manufacture of materials such as artificial resins.


manufacture of phthaleins, phthalates, benzoic acid, synthetic indigo, artificial resins (glyptal).

Contact allergens

Phthalic anhydride is used in the manufacture of unsaturated polyesters and as a curing agent for epoxy resins. When used as a pigment, it can be responsible for sensitization in ceramic workers. Phthalic anhydride per se is not responsible for the sensitization to the resin used in nail varnishes phthalic anhydride/trimellitic anhydride/ glycols copolymer.

Fire Hazard

Combustible material: may burn but does not ignite readily. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.


ChEBI: The cyclic dicarboxylic anhydride that is the anhydride of phthalic acid.

Purification Methods

Distil the anhydride under reduced pressure. Purify it from the acid by extracting with hot CHCl3, filtering and evaporating. The residue is crystallised from CHCl3, CCl4 or *benzene, or sublimed. Fractionally crystallise it from its melt. Dry it under vacuum at 100o. [Saltiel J Am Chem Soc 108 2674 1986, Beilstein 17/11 V 253.]

Air & Water Reactions

Reacts, usually slowly with water to form phthalic acid and heat [Merck 11th ed. 1989]. The phthalic acid is somewhat soluble in water.

Reactivity Profile

Phthalic anhydride reacts exothermically with water. The reactions are sometimes slow, but can become violent when local heating accelerates their rate. Acids accelerate the reaction with water. Incompatible with acids, strong oxidizing agents, alcohols, amines, and bases. 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. & Ind. 20:790. 1972]. Phthalic anhydride reacts violently with CuO at elevated temperatures [Park, Chang-Man, Richard J. Sheehan. hthalic Acids and Other Benzenepolycarboxylic Acids Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. 2005]. Mixtures of Phthalic anhydride and anhydrous CO2 explode violently if heated [eaflet No. 5, Inst. of Chem., London, 1940].

Health Hazard

Solid irritates skin and eyes, causing coughing and sneezing. Liquid causes severe thermal burns.

85-44-9 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
Sigma-Aldrich (125733)  Phthalicanhydride  ReagentPlus®, 99% 85-44-9 125733-16KG 3,472.56CNY Detail
Sigma-Aldrich (125733)  Phthalicanhydride  ReagentPlus®, 99% 85-44-9 125733-2.5KG 883.35CNY Detail
Sigma-Aldrich (125733)  Phthalicanhydride  ReagentPlus®, 99% 85-44-9 125733-1KG 372.06CNY Detail
Sigma-Aldrich (320064)  Phthalicanhydride  ACS reagent, ≥99% 85-44-9 320064-2.5KG 1,903.59CNY Detail
Sigma-Aldrich (320064)  Phthalicanhydride  ACS reagent, ≥99% 85-44-9 320064-500G 618.93CNY Detail
Sigma-Aldrich (320064)  Phthalicanhydride  ACS reagent, ≥99% 85-44-9 320064-25G 427.05CNY Detail
Alfa Aesar (41771)  Phthalic anhydride, ACS, 99.0-100.2%    85-44-9 2.5kg 1854.0CNY Detail
Alfa Aesar (41771)  Phthalic anhydride, ACS, 99.0-100.2%    85-44-9 *4x500g 1491.0CNY Detail
Alfa Aesar (41771)  Phthalic anhydride, ACS, 99.0-100.2%    85-44-9 500g 437.0CNY Detail
Alfa Aesar (A14955)  Phthalic anhydride, 99%    85-44-9 5000g 653.0CNY Detail
Alfa Aesar (A14955)  Phthalic anhydride, 99%    85-44-9 1000g 544.0CNY Detail
Alfa Aesar (A14955)  Phthalic anhydride, 99%    85-44-9 250g 170.0CNY Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name phthalic anhydride

1.2 Other means of identification

Product number -
Other names 1,3-DIHYDRO-IMIDAZOL-2-ONE

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Phthalic anhydride is an important chemical intermediate in the plastics industry from which are derived numerous phthalate esters that function as plasticizers in synthetic resins. Phthalic anhydride itself is used as a monomer for synthetic resins such as glyptal, the alkyd resins, and the polyester resins. Phthalic anhydride is also used as a precursor of anthraquinone, phthalein, rhodamine, phthalocyanine, fluorescein, and xanthene dyes. Phthalic anhydride is used in the synthesis of primary amines, the agricultural fungicide phaltan, and thalidomide. Other reactions with phthalic anhydride yield phenolphthalein, benzoic acid, phthalylsulfathiazole (an intestinal antimicrobial agent), and orthophthalic acid.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:85-44-9 SDS

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