Definition of phthalic anhydride in English:

phthalic anhydride

Syllabification: phthal·ic an·hy·dride

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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