Terephthalic acid: sinadaran Properties, da shirye-shiryen da kuma aikace-aikace

Muhimmanci wakilan polycarboxylic aromatic mahadi phthalic acid Kalam wakilta wasu isomers - ortho-isomer (kai tsaye, phthalic acid), meta-isomer (isophthalic acid) da kuma para-isomer (terephthalic). Duk da wannan kungiyar da abubuwa sosai yadu a yi amfani da daban-daban da masana'antu a filayen.

Terephthalic acid - m colorless crystalline foda samu a dauki ruwa lokaci hadawan abu da iskar shaka na paraxylene a gaban cobalt salts doguwar catalysts. The hulda da abu da dama alcohols take kaiwa ga samuwar na sinadaran mahadi da ester kungiyar. The most m aikace-aikace ne dimethyl terephthalate.

Terephthalic acid ma zartar ga kira na polyethylene terephthalate (so) - a m zafi-resistant polymer samu da polycondensation dauki na abu da ethylene glycol. Sa'an nan daga gare ta nuna filastik kwalabe, polyester zaruruwa terilenovoy Group, wanda aka fi sani a karkashin sunan "polyester", kazalika da dama marufi kwantena ga masana'antun sarrafa kayayyakin abinci, kayan lantarki da kuma daban-daban iri kayan aiki.

Bisa ga sinadaran Properties kama da terephthalic acid monocarboxylic fili. Ta kan dumama ko a ƙarƙashin rinjayar, da ake kira dehydrating abubuwa readily suranta salts, esters, hadaddun kwayoyin tsarin, anhydrides, amides, kamar daya ko biyu carboxyl kungiyoyin. Terephthalic acid ma shiga esterification dauki, kamar yadda sakamakon abin da mono- da diesters suna kafa. Bayan da dumama da crystalline abu zuwa da zazzabi ba kasa da ɗari biyu da darajõji lura decarboxylation ba mahadi dauke da wani kadan yawan carboxyl kungiyoyin. Duk da haka, da dauki a electrophilic canzawa Kashe zobe fara ci gaba da girma da wahala.

Phthalic acid da sauƙi samu a kore pigment na shuke-shuke da poppy iri pods. Na Kalam ne mafi muhimmanci mahadi dibutyl ether da dimethyl phthalate, wanda ake amfani da plasticizers na cellulose kayayyakin, roba polymers da rubbers. Har ila yau, dimethyl, diethyl da dibutyl phthalate suke da muhimmanci aka gyara daga daban-daban repellents.

Isophthalic acid da aka yi amfani da ko'ina a cikin yi na unsaturated polyester resins. Tun isophthalates ne m plasticizers. Duk da haka, mafi girma aikace-aikace na benzenepolycarboxylic kungiyar na mahadi yana da yet terephthalic acid, wanda ake amfani da kira na da muhimmanci abubuwa ga masana'antu a matsayin polyethylene terephthalate da dimethyl terephthalate. Suna amfani ga yi na mota na daban-daban sunadaran, igiyoyi, na'ura mai ɗamararku, kama kifi da raga, filafili, magudi, trawls, man fetur da kuma nefteustoychivyh hoses, fasteners "walƙiya", kirtani na tennis rackets, kuma yafi. Bugu da ƙari, m yadi yarn a cikin abin da samar da abu amfani, samar da jesuna, daban-daban nama (crepe, tweed, Satin, da dai sauransu), Curtains kayayyakin, raincoat, laima da kaya kayan, shirts, safa, da yara tufafi da dai sauransu.

A ƙarshe, ya kamata a lura da cewa dukkan acid benzenepolycarboxylic jerin ne musamman m da guba abubuwa. Saboda haka, yana da yaushe a haɗe zuwa Material Safety Data Sheet, wanda ya bada jerin sunayen duk kaddarorin da kuma halaye na fili, kazalika da hanya da kuma dokoki domin aiki tare da su.