Anhydride ya Phthalic ni ifumbire mvaruganda hamwe na formula C6H4 (CO) 2O. Ni anhydride ya aside ya phthalic. Iki gikoresho kitagira ibara ninganda zingenzi zinganda, cyane cyane kubikorwa byinshi bya plasitiki ya plastiki

.Phhalic anhydride ningirakamaro hagati yimiti munganda za plastiki zikomokamo estter nyinshi ya phalite ikora nka plasitike mumashanyarazi. Anhydride ya Phthalic ubwayo ikoreshwa nka monomer kubisigarira bya sintetike nka glyptal, ibisigazwa bya alkyd, hamwe na polyester.
Anhydride ya Phthalic nayo ikoreshwa nkibibanziriza anthraquinone, phthalein, rhodamine, phthalocyanine, fluorescein, n irangi rya xanthene.
Anhydride ya Phthalic ikoreshwa muguhuza amine yibanze, phaltan yubuhinzi, na thalidomide. Ibindi bitekerezo hamwe na anhydride ya phthalic itanga fenolphthalein, aside benzoic, phthalylsulfathiazole (antimicrobial intestinal intestinal), na aside orthophthalic.