Products
Diethyl Maleate
Structural Formula
Zvinhu Zvenyama
Chitarisiko: mvura isina ruvara inoonekera
Density: 1.064 g/mL pa25 °C (lit.)
Kunyungudika: -10 °C (lit.)
Nzvimbo yekubikira: 225 °C (lit.)
Kuwanda kwemhepo: 5.93 (vs air)
Utsi hwemhepo: 1mm Hg (14°C)
Refractivity:n20/D 1.441 (lit.)
Flash Point: 200°F
Safety Data
Ndezvezvinhu zvakajairika
Tsika kodhi:2917190090
Export Mutero Kudzoserwa Kwemari (%):9%
Application
Inoshandiswa semushonga wezvipembenene wepakati kugadzirira malathion, organophosphorus pesticide, uye yepakati yemushonga, pefiyumu uye mvura yemhando stabilizer (organic polycarboxylic acid phosphonic acid compound).Inogonawo kushandiswa se solvent ye resin uye nitrocellulose, plasticizer, organic synthesis, insecticide, polymer monomer uye plastiki mubatsiri.
Properties uye kugadzikana
Yakagadzikana pakudziya kwekamuri uye kumanikidza.Zvinhu zvinorambidzwa: oxidizing agents, zvinoderedza, acids, mabhesi.Inogona kupiswa, teerera kune kunobva moto paunenge uchishandisa nekuchengetedza.Dzivirira inhalation yemhute uye usasangana neganda.
Kuchengeta nzira
Chengetedza munzvimbo inotonhorera, yakaoma uye ine mhepo.Chenjerera kune kwaunobva moto paunenge uchishandisa nekuchengetedza.
Synthesis nzira
1. Inogadzirwa ne esterification ye maleic anhydride uye ethanol muhupo hwe sulfuric acid;inogona zvakare kuwanikwa nekutsinhana kutendeuka ne cation exchange resin se catalyst.Zviri mukati mediethyl maleate muchigadzirwa cheindasitiri ndeye ≥98%, uye tani yega yega yechigadzirwa inodya 585kg yemaleic anhydride (95%) uye 604kg ethanol (95%).
2. Nzira yekugadzirira kwayo inonyanya kugadzirwa ne esterification ye maleic anhydride uye ethanol muhupo hwe sulfuric acid.Kuita uku kune marudzi maviri emumhepo ine benzene esterification uye negative pressure isina benzene esterification.
(1) Atmospheric pressure ine benzene esterification
Wedzera imwe chiyero chebenzene ne ethanol muhari ye esterification reaction, isa mu maleic anhydride, wedzera concentrated sulfuric acid dropwise pasi pekubvongodza, kupisa nemhepo ine jaketi, uye ita kuti reactants iite esterification reaction inosvika 75℃.Mvura inogadzirwa inobviswa ne ternary azeotropic distillation ine benzene uye ethanol, uye iyo yekumusoro layer ye benzene uye ethanol liquid inodzokororwa kune reaction poto.Inenge 13 ~ 14h gare gare, kana tembiricha yeshongwe ye distillation ichikwira kusvika 68.2 ℃, iyo yekuparadzanisa yakadzika mwero wemvura haisisiri kukwira, zvichiratidza kuti mvura yese muhari yekupindura yave evaporated, iyo esterification reaction yapera.Misa reflux, enderera mberi nedistillation kusvika 95-100 ℃, distillation yebenzene uye ethanol.Nyatsodzika kusvika pa50 ℃, gadzirisa ne5% aqueous sodium carbonate solution, geza nemvura uye wobvisa yasara benzene ne ethanol under vacuum kuti uwane chigadzirwa diethyl maleic acid.
(2) Negative pressure benzene-isina esterification
Esterification ye maleic anhydride uye ethanol pasi pechiito che sulfuric acid inoitwa pasi peimwe vacuum uye tembiricha kuti ibudise ethanol uye mvura inogadzirwa nekuita mune gasi mamiriro, uye ipapo ethanol inoparadzaniswa kuburikidza nechikamu chechikamu kuti iite reflux. iyo esterification, kuitira kuti maitiro aite kunge akakwana.Iyi nzira inogona kupfupisa kutenderera kwekuita, kuvandudza goho uye mhando yechigadzirwa, kugadzirisa nharaunda yekushanda, zvirimwa zvakawanda zvekugadzira zvepamba zvinoshandisa nzira iyi.
Pamusoro pezvo, cation exchange resin inogona zvakare kushandiswa sechinhu chinokonzeresa chekushandura shanduko kugadzira diethyl maleic acid.
Nzira yekunatsa: kugeza ne dilute potassium carbonate solution, kuomesa neanhydrous potassium carbonate kana sodium sulfate uye distillation pasi pekumanikidzwa kwakaderedzwa.
