Iimveliso
Ubungcali kwimveliso yotywala bepropargyl, 1,4 butynediol kunye ne-3-chloropropyne
Ukuveliswa kwe-1, i-4-butanediol (BDO) nge-maleic anhydride method
Inkqubo ye-esterification kunye ne-hydrogenation ye-maleic anhydride yaphuhliswa yiNkampani ye-Davy Mckee e-United Kingdom.Iquka amanyathelo amathathu: (1) ukusabela phakathi kwe-maleic anhydride kunye ne-ethanol;② I-BDO yalungiswa nge-hydrolysis ye-diethyl maleic acid;③ Ukwahlulwa kunye nokucokiswa kweemveliso zokusabela.Umlinganiselo we-BDO, GBL kunye ne-THF unokutshintshwa ngokulungelelanisa iimeko zenkqubo.Ngenxa yenzuzo yeendleko zemveliso ye-BDO, izixhobo ezininzi ezitsha ziye zakhiwa yile nkqubo kwiminyaka yakutshanje, ekwayeyona ndlela iphambili yophuhliso lwenkqubo yokuvelisa i-BDO.Impendulo ye-Esterification:
Ukusabela kwi-Hydrogenation
Okwangoku, kukho neenkqubo ze-n-butane-maleic anhydride, ezithi ziqale zihlanjululwe yi-gas phase oxidation ye-n-butane ukuvelisa i-anhydride ye-maleic, kwaye i-anhydride ye-maleic i-esterfied kunye ne-methanol ukuvelisa i-dimethyl maleate.Ukuguqulwa kwe-anhydride ye-maleic kunokufikelela kwi-100% phantsi kwe-catalyst efanelekileyo.Ekugqibeleni, i-BDO iveliswa yi-hydrogenation kunye ne-hydrolysis ye-maleic anhydride catalyst.Iingenelo zale nkqubo kukuba kulula ukwahlula ukungcola okufana ne-methanol kunye namanzi emva kwe-esterification, kwaye iindleko zokwahlula ziphantsi.Ngaphezu koko, ukuguquguquka kwe-dimethyl maleate kwanda, okwenza ukuba uluhlu lokusebenza lwesigaba segesi se-hydrogenation sibe banzi, kwaye izinga lokuguqulwa kwe-methanol esterification lingaphezulu kwe-99.7%.Ke ngoko, akukho ngxaki yokuqala yokucoca i-diethyl maleate.Ngoko ke, akuyimfuneko ukuphinda isetyenziswe yonke i-anhydride ye-maleic engaphendulwanga kunye ne-mono-methyl ester, kodwa i-methanol ecocekileyo kuphela, eyenza inkqubo yokuvelisa ibe lula kwaye inciphise kakhulu utyalo-mali lweprojekthi xa kuthelekiswa neteknoloji yangaphambili.
