Kupanga kwa 1, 4-butanediol (BDO) ndi njira ya maleic anhydride

Kupanga 1, 4-butanediol (BDO) ndi njira ya maleic anhydride

Kufotokozera Kwachidule:

Pali njira ziwiri zazikulu zopangira BDO ndi maleic anhydride.Imodzi ndi njira yachindunji ya hydrogenation ya maleic anhydride yopangidwa ndi Mitsubishi Petrochemical ndi Mitsubishi Chemical ku Japan m'ma 1970, yomwe imadziwika ndi kupanga munthawi yomweyo BDO, THF ndi GBL mu njira ya hydrogenation ya maleic anhydride.Zamgulu zosiyanasiyana nyimbo akhoza analandira ndi kusintha ndondomeko zinthu.Ina ndi njira ya gasi esterification hydrogenation ya maleic anhydride yopangidwa ndi UCC Company ndi Davey Process Technology Company ku United Kingdom, yomwe imapangidwa kuchokera kuukadaulo wocheperako wa carbonyl synthesis.Mu 1988, kuunikanso kwa kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kakeMu 1989, TEKNOLOGY INASALUTSIDWA KU DongSANG CHEMICAL COMPANY OF Korea NDI DONGGU CHEMICAL Company OF Japan KUTI AMANGA 20,000-TON/chaka 1, 4-BUtanEDIOL INDUSTRIAL Production PLANT.

Titumizireni imelo

Tsatanetsatane wa Zamalonda

Zolemba Zamalonda

Njira yopangira esterification ndi hydrogenation ya maleic anhydride idapangidwa ndi Davy Mckee Company ku United Kingdom.Zili ndi masitepe atatu: (1) zomwe zimachitika pakati pa maleic anhydride ndi ethanol;② BDO idakonzedwa ndi hydrolysis ya diethyl maleic acid;③ Kulekanitsa ndi kuyengedwa kwa zinthu zomwe zimachitika.Chiŵerengero cha BDO, GBL ndi THF chingasinthidwe mwa kusintha momwe zinthu ziliri.Chifukwa cha mtengo wamtengo wapatali wopangira BDO, zida zambiri zatsopano zapangidwa ndi njirayi m'zaka zaposachedwa, zomwenso ndizomwe zimapangidwira kupanga BDO.Esterification reaction:

Kupanga 1, 4-butanediol (BDO) ndi maleic anhydride njira 2

Hydrogenation reaction

Kupanga kwa 1, 4-butanediol (BDO) ndi njira ya maleic anhydride 3

Pakalipano, palinso njira za n-butane-maleic anhydride, zomwe zimayambitsidwa ndi mpweya wa n-butane wa n-butane kuti apange anhydride ya maleic, ndiyeno maleic anhydride amapangidwa ndi methanol kuti apange dimethyl maleate.Kutembenuka kwa maleic anhydride kumatha kufika 100% pansi pa chothandizira choyenera.Pomaliza, BDO imapangidwa ndi hydrogenation ndi hydrolysis ya chothandizira maleic anhydride.Ubwino wa njirayi ndikuti ndikosavuta kulekanitsa zonyansa monga methanol ndi madzi pambuyo pa esterification, ndipo mtengo wolekanitsa ndi wotsika.Kuphatikiza apo, kusakhazikika kwa dimethyl maleate kumachulukitsidwa, zomwe zimapangitsa kuti gawo la gasi hydrogenation lichuluke, ndipo kutembenuka kwa methanol esterification kuli pamwamba pa 99.7%.Choncho, palibe vuto loyamba la kuyeretsedwa kwa diethyl maleate.Choncho, si koyenera kuti akonzenso zonse zosakhudzidwa maleic anhydride ndi mono-methyl ester, koma methanol koyera, zomwe zimachepetsa kupanga ndi kuchepetsa kwambiri ndalama zonse za polojekitiyi poyerekeza ndi luso lapitalo.

Zam'mbuyo: 1,4-butanediol (BDO) ndikukonzekera kwake kwa PBAT yapulasitiki yosasinthika

Ena: 1, 4-butanediol katundu

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