Kayayyaki
Kwarewa a cikin samar da barasa na propargyl, 1,4 butynediol da 3-chloropropyne.
Samar da 1, 4-butanediol (BDO) ta hanyar anhydride na maleic
Kamfanin Davy Mckee da ke Burtaniya ne ya samar da tsarin esterification da hydrogenation na maleic anhydride.Ya ƙunshi matakai uku: (1) amsawa tsakanin maleic anhydride da ethanol;② BDO an shirya shi ta hanyar hydrolysis na diethyl maleic acid;③ Rabuwa da tace samfuran amsawa.Ana iya canza rabon BDO, GBL da THF ta hanyar daidaita yanayin tsari.Saboda fa'idar farashin samar da BDO, sabbin na'urori da yawa an gina su ta wannan tsari a cikin 'yan shekarun nan, wanda kuma shine babban yanayin ci gaban tsarin samar da BDO.Haɓakar haɓakawa:
Hydrogenation dauki
A halin yanzu, akwai kuma hanyoyin n-butane-maleic anhydride, wanda da farko ke haifar da iskar gas na n-butane don samar da maleic anhydride, sa'an nan kuma an sanya maleic anhydride da methanol don samar da dimethyl maleate.Juyawa na anhydride na maleic zai iya kaiwa 100% a ƙarƙashin abin da ya dace.A ƙarshe, BDO yana samuwa ta hanyar hydrogenation da hydrolysis na maleic anhydride catalyst.Amfanin wannan tsari shine yana da sauƙi don raba ƙazanta irin su methanol da ruwa bayan esterification, kuma farashin rabuwa ya ragu.Bugu da ƙari, rashin daidaituwa na dimethyl maleate yana ƙaruwa, wanda ke sa aikin kewayon matakin iskar gas na hydrogenation ya fi girma, kuma yawan canjin methanol esterification yana sama da 99.7%.Saboda haka, babu matsalar tsarkakewar farko na diethyl maleate.Sabili da haka, ba lallai ba ne a sake yin amfani da duk anhydride na maleic anhydride da mono-methyl ester da ba a yi amfani da su ba, amma kawai methanol mai tsabta, wanda ke sauƙaƙe tsarin samarwa kuma yana rage yawan zuba jari na aikin idan aka kwatanta da fasahar da ta gabata.
