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Haɗin sunadaran Furfural

Furfural (C4H3O-CHO), ana kuma kiransa 2-furaldehyde, mafi shahararren dan dan furan kuma asalin sauran mahimman furan fasaha. Ruwa ne mara launi (ruwan tafasa 161.7 ° C, takamaiman nauyi 1.1598) wanda ke karkashin duhu akan shafar iska. Yana narkewa cikin ruwa har zuwa kashi 8.3 cikin ɗari a 20 ° C kuma kwata-kwata bashi da matsala da barasa da ether.

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 Tsawan shekaru kimanin 100 shine ya nuna lokacin daga gano furfural a cikin dakin gwaje-gwaje zuwa farkon kasuwancin kasuwanci a cikin 1922. Ci gaban masana'antu na gaba yana ba da kyakkyawan misali na amfanin masana'antu na ragowar kayan gona. Masara, kwalliyar oat, kwalliyar auduga, kwalliyar shinkafa, da bagasse sune manyan kayan albarkatun kasa, wanda ake cika shekara-shekara da shi wanda ke tabbatar da ci gaba da wadatar. A cikin aikin masana'antu, yawancin kayan albarkatun kasa da narkewar sulfuric acid ana tururinsu cikin matsi a cikin manyan narkewar narkewar abinci. An cire furfural da aka kafa ci gaba tare da tururi, kuma yana mai da hankali ta hanyar murɗawa; distillate, akan sandaro, ya rabu biyu. Layer ɗin ƙasa, wanda ya ƙunshi furfural, ya bushe ta hanyar ɓoyewa don samun furfural na mafi ƙarancin kashi 99 na tsabta.

Ana amfani da Furfural a matsayin mai narkewa don tace mai da rosin, da kuma inganta halaye na man dizal da kuma kayan hada gwangwani na gwangwani. Ana amfani dashi sosai a cikin ƙera ƙafafun abrasive ƙafafu kuma don tsarkake butadiene da ake buƙata don samar da roba roba. Kirkin nailan yana buƙatar hexamethylenediamine, wanda furfural shine tushen mahimmanci. Sanda tare da phenol yana ba da furfural-phenolic resins don amfani da yawa.

Lokacin da aka wuce kumburin furfural da hydrogen a kan haɓakar tagulla a yanayin zafi mai ƙarfi, an kafa barasar furfuryl. Ana amfani da wannan mahimmancin samfurin a masana'antar robobi don samar da siminti masu jure lalata da abubuwa masu simintin gyare-gyare. Irin wannan hydrogenation din na furfuryl barasa akan wani mai kara kuzari yana ba tetrahydrofurfuryl barasa, wanda daga ciki ne ake samun nau'ikan esters da dihydropyran.

 A cikin ayyukanta azaman aldehyde, furfural yana da kamanceceniya da benzaldehyde. Don haka, yana fuskantar tasirin Cannizzaro a cikin alkali mai ruwa mai ƙarfi; ya rage furoin, C4H3OCO-CHOH-C4H3O, ƙarƙashin tasirin potassium cyanide; an canza shi zuwa hydrofuramide, (C4H3BA-CH)3N2, ta aikin ammoniya. Koyaya, furfural ya bambanta da benzaldehyde ta hanyoyi da yawa, wanda autoxidation zai zama misali. Dangane da iska a yanayin zafin jiki na ɗaki, furfural ya kaskanta kuma an manne shi izuwa formic acid da formylacrylic acid. Furoic acid farin farin kristal ne mai amfani azaman kwayar cuta da kiyayewa. Esters dinsa ruwa ne mai kamshi wanda ake amfani dashi azaman kayan hadin turare da dandano.


Post lokaci: Aug-15-2020