Te whakaputanga o te 1, 4-butanediol (BDO) ma te tikanga maleic anhydride

I tenei wa, kei reira ano nga tukanga anhydride n-butane-maleic, he mea whakakorikori i te tuatahi e te hau o te hau o te n-butane ki te whakaputa maleic anhydride, katahi ka whakahiatohia te maleic anhydride ki te methanol hei whakaputa i te dimethyl maleate.Ko te huringa o te maleic anhydride ka tae ki te 100% i raro i te whakakorikori e tika ana.Ka mutu, ka hangaia te BDO ma te hauwai me te hauwai o te whakakorikori anhydride maleic.Ko nga painga o tenei tukanga he mea ngawari ki te wehe i nga poke penei i te methanol me te wai i muri i te esterification, a he iti ake te utu wehewehe.I tua atu, ka piki ake te ahuakore o te dimethyl maleate, na te mea ka nui ake te awhe mahi o te wahanga hauwai hauwai, a ko te tere o te hurihanga o te methanol esterification kei runga ake i te 99.7%.No reira, karekau he raruraru purenga tuatahi o te diethyl maleate.No reira, ehara i te mea tika ki te hangarua i nga anhydride maleic katoa me te mono-methyl ester, engari ko te methanol parakore anake, ka ngawari te mahi whakaputa me te tino whakaiti i te haumitanga katoa o te kaupapa i whakaritea ki nga hangarau o mua.