Anhydride ya Phthalic, yomwe imadziwika kuti phthalic anhydride, ndi chinthu chofunikira kwambiri chachilengedwe. Ndi mankhwala oletsa kutentha omwe amagwiritsidwa ntchito kwambiri pa mphira wachilengedwe, mphira wa isoprene, mphira wa butadiene, mphira wa styrene-butadiene, ndi mphira wa nitrile, kuteteza kutentha kwambiri ndikuwonjezera chitetezo cha ntchito. Sizimakhudza kwambiri nthawi yovulcanization ndi kukalamba kwa chinthu chomalizidwa. Ndi yothandiza kwambiri pa machitidwe a Chemicalbook okhala ndi thiazole-guanidine ndi thiazole-thiuram accelerators, komanso mankhwala okhala ndi alkaline accelerators, koma si yoyenera machitidwe a vulcanization opanda thiuram. Imafalikira mosavuta, siiphuka, ndipo imakhala ndi kuipitsidwa kochepa, koma mankhwala oyera a mphira amatha kuwonetsa kusintha pang'ono mtundu wake akakumana ndi kuwala, ndipo nthawi zambiri sikoyenera kugwiritsidwa ntchito ndi mankhwala oyera a mphira.

Phthalic anhydride ndi anhydride yozungulira yomwe imapangidwa ndi kusowa madzi m'thupi kwa phthalic acid mkati mwa mamolekyulu. Imatha kuphwanyidwa, kuphatikizika, ndi kuphatikizika kwa ammonolysis, ndipo imachita ndi ma hydrocarbons onunkhira kuti ipange zinthu zochokera ku anthraquinone. M'mafakitale, phthalic anhydride imapangidwa ndi kuphatikizika kwa naphthalene ndi mpweya pa 350–360 °C pansi pa vanadium pentoxide catalysis, kapena ndi kuphatikizika kwa o-xylene ndi mpweya. Phthalic anhydride ingagwiritsidwe ntchito m'malo mwa phthalic acid, makamaka imachita ndi monohydric alcohols kuti ipange ma esters, monga dibutyl phthalate ndi dioctyl phthalate.

Kapangidwe ka mankhwala: Makristalo oyera ngati singano okhala ndi fungo lochepa. Amasungunuka pang'ono m'madzi otentha ndi ether, amasungunuka mu acetone, ethanol, benzene, ndi pyridine. Amasanduka phthalic acid akakumana ndi madzi otentha kapena akakhudzana ndi madzi kwa nthawi yayitali. Amasunga bwino. Amayaka moto. Zosakaniza za fumbi ndi mpweya zimayambitsa kuphulika; malire ocheperako a kuyaka (LCL) 12.6 g/cm³. Fumbi lotayidwa limayambitsa ngozi ya moto. Kutentha kwa kuyaka kwa aerosol 160°C, kutentha koyatsa moto 545°C. Poizoni; malire ovomerezeka a 1 mg/m³.

Phthalic anhydride ndi imodzi mwa zinthu zofunika kwambiri zopangira mankhwala achilengedwe. Zinthu zake zazikulu ndi monga dibutyl phthalate, dioctyl phthalate, ndi diisobutyl phthalate, zomwe zimagwiritsidwa ntchito ngati mapulasitiki a PVC, ndi zina zotero. Ingagwiritsidwenso ntchito popanga ma unsaturated polyester resins, alkyd resins, utoto ndi utoto, utoto wosiyanasiyana, zowonjezera chakudya, laxative phenolphthalein mu mankhwala, komanso mankhwala ophera tizilombo monga phosmet, metribuzin, ndi sodium saccharin.

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