Definition of phthalic anhydride in English:

phthalic anhydride

Line breaks: phthal¦ic an|hyd¦ride

noun

[mass noun] Chemistry
  • A crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes.
    • A bicyclic anhydride; chemical formula: C6H4(CO)2O
    More example sentences
    • In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride.
    • Alkyd resins are produced by the curing reaction of a material like phthalic anhydride with glycerol in the presence of a fatty acid.
    • Succinic anhydride has almost the same rate constant as acetic, while maleic anhydride reacts 10 times as quickly and phthalic anhydride four times.

Origin

mid 19th century: phthalic, shortening of naphthalic (see naphthalene).

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