Phthalic anhydride, wanda aka fi sani da phthalic anhydride, muhimmin abu ne na sinadarai na halitta. Yana da amfani ga roba ta halitta, robar isoprene, robar butadiene, robar styrene-butadiene, da robar nitrile, yana hana ƙonewa da inganta amincin aiki. Yana da ƙaramin tasiri akan lokacin vulcanization da halayen tsufa na samfurin da aka gama. Yana da tasiri musamman ga tsarin Chemicalbook wanda ke ɗauke da accelerators na thiazole-guanidine da thiazole-thiuram, da kuma mahadi masu accelerators na alkaline, amma bai dace da tsarin vulcanization ba tare da thiuram ba. Yana warwatse cikin sauƙi, baya fure, kuma yana da ƙarancin gurɓatawa, amma fararen mahaɗan roba na iya nuna ɗan canji a launi lokacin fallasa ga haske, kuma gabaɗaya bai dace da amfani da fararen mahaɗan roba ba.

Phthalic anhydride wani nau'in anhydride ne mai cyclic wanda aka samar ta hanyar bushewar phthalic acid a cikin ƙwayoyin halitta. Yana iya jure hydrolysis, alcoholysis, da ammonolysis, kuma yana amsawa da aromatic hydrocarbons don haɗa anthraquinone derivatives. A fannin masana'antu, ana samar da phthalic anhydride ta hanyar oxidation na naphthalene tare da iska a 350–360 °C a ƙarƙashin catalysis na vanadium pentoxide, ko kuma ta hanyar oxidation na o-xylene tare da iska. Ana iya amfani da Phthalic anhydride a matsayin madadin phthalic acid, galibi yana amsawa da monohydric alcohols don samar da esters, kamar dibutyl phthalate da dioctyl phthalate.

Halayen Sinadarai: Farin lu'ulu'u masu kama da allura tare da ɗan ƙamshi. Ƙananan lu'ulu'u. Yana narkewa kaɗan a cikin ruwan zafi da ether, yana narkewa a cikin acetone, ethanol, benzene, da pyridine. Yana canzawa zuwa phthalic acid idan ya taɓa ruwan zãfi ko kuma ya shafe tsawon lokaci yana hulɗa da ruwa. Ajiya ta tabbata. Mai kama da wuta. Haɗe-haɗen ƙura da iska suna haifar da haɗarin fashewa; ƙarancin iyaka na ƙonewa (LCL) 12.6 g/cm³. Kura da aka ajiye tana haifar da haɗarin wuta. Zafin konewa na iska 160°C, zafin wuta ta atomatik 545°C. Mai guba; iyaka mai yarda da maida hankali 1 mg/m³.

Phthalic anhydride yana ɗaya daga cikin muhimman kayan albarkatun sinadarai na halitta. Manyan abubuwan da ya ƙunsa sun haɗa da dibutyl phthalate, dioctyl phthalate, da diisobutyl phthalate, waɗanda ake amfani da su azaman masu plasticizers don PVC, da sauransu. Haka kuma ana iya amfani da shi wajen samar da resin polyester marasa cika, resin alkyd, dyes da pigments, fenti iri-iri, ƙarin abinci, phenolphthalein mai laxative a magani, da magungunan kashe kwari kamar phosmet, metribuzin, da sodium saccharin.

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