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.

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.

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Phthalic Anhydride industry market dynamics in Italy from 2005 to 2019, consisting of market size, demand and production outlook, demand by end-use sector, and average prices
Phthalic Anhydride industry market dynamics in Brazil from 2005 to 2019, consisting of market size, demand and production outlook, demand by end-use sector, and average prices
1] is due to the reaction of hydroxyl group in the polyol with phthalic anhydride and also the formation of carboxylic acid and ester groups.
The increases in adjusted net income and adjusted diluted earnings per share in 2011 were due primarily to the acquisition in The Netherlands, higher prices for phthalic anhydride and carbon black feedstock, and higher volumes and prices for crossties, partially offset by increased raw material costs.
The hydroxyesters were prepared by reacting the simple phthalic or tetrachlorinated phthalic anhydride with polyethylene glycol (PEG) (with molar mass of either 600 or 1000 Da) in the hot stage (80[degrees]C) under [N.
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Six samples had the flame retardant tri(2-chloroethyl)phosphate and five contained phthalic anhydride, used in making plastics.
NPC's Isfahan petrochemical complex is having a 21,500 t/y phthalic anhydride (PA) unit and a 40,000 t/y dioctyl phthalate (DOP) plant built.
Contributing factors: All companies point to rising costs of raw materials such as styrene, various glycols, phthalic anhydride, and cobalt promoters.
Table 4-principal compounds used in manufacture of esters Organic acids Monobasic acids Dibasic acids Tribasic acids Oleic Phthalic anhydride Trimellitic anhydride Stearic Adipic acid Citric acid Benzoic Sebacic acid Pelargonic Azelaic acid Glutaric acid Organic alcohols Monohydric Dihydric Trihydric 2-Ethylhexanol Propylene glycol Glycerol Isodecanol 1,3 butandiol Trimethylolpropane 6-10 linear alcohols 1,4 butandiol Benzyl alcohol Isononyl alcohol
The first project, Hoechst Ravi Chemical Limited, is based on petrochemicals and will produce 15,000 tonnes of Di-Octyle Pthalate, 11,600 tonnes Phthalic Anhydride and 580 tonnes of Maelic Anhydride annually.
t) Chemicals for which more than 25% of sites had modeled or monitored levels that exceeded the associated health reference level in the United States: acetaldehyde, acrolein, arsenic, benzene, beryllium, carbon disulfide, carbon tetrachloride, chloroform, ethylene oxide, formaldehyde, hydrogen sulfide, methyl ethyl ketone, methyl isocyanate, methyl methacrylate, nitrobenzene, prerchloroethylene, phenol, phthalic anhydride, styrene tetramethyl lead, toluene diisocvanate, and vinyl chloride.