Cov khoom
Diethyl Maleate
Cov qauv qauv
Lub cev muaj zog
Cov tsos mob: tsis muaj xim tsis muaj pob tshab kua
Ceev: 1.064 g / mL ntawm 25 ° C (lit.)
Melting point: -10 ° C (lit.)
Kub taw tes: 225 ° C (lit.)
Vapor ceev: 5.93 (vs huab cua)
Vapor siab: 1mm Hg (14 ° C)
Refractivity: N20 / D 1.441 (lit.)
Flash Point: 200 ° F
Cov ntaub ntawv kev nyab xeeb
Nws belongs rau cov khoom siv
Kev lis kev cai code: 2917190090
Export Tax Refund Rate (%): 9%
Daim ntawv thov
Nws yog siv los ua cov tshuaj tua kab nruab nrab rau kev npaj malathion, tshuaj tua kab organophosphorus, thiab ib qho nruab nrab rau cov tshuaj, naj hoom thiab dej zoo stabilizer (organic polycarboxylic acid phosphonic acid compound).Nws kuj tseem siv tau los ua cov kuab tshuaj rau resin thiab nitrocellulose, plasticizer, organic synthesis, tshuaj tua kab, polymer monomer thiab yas pab.
Khoom thiab stability
Nyob ruaj khov ntawm chav tsev kub thiab siab.Cov tshuaj txwv tsis pub: oxidizing tus neeg sawv cev, txo cov neeg ua haujlwm, acids, bases.Nws tuaj yeem raug hlawv, xyuam xim rau qhov hluav taws kub thaum siv thiab khaws cia.Tiv thaiv kom tsis txhob nqus cov vapors thiab tsis txhob sib cuag nrog daim tawv nqaij.
Txoj kev khaws cia
Khaws rau hauv qhov chaw txias, qhuav thiab ventilated.Ua tib zoo saib xyuas qhov hluav taws kub thaum siv thiab khaws cia.
Synthesis method
1. Nws yog tsim los ntawm esterification ntawm maleic anhydride thiab ethanol nyob rau hauv lub xub ntiag ntawm sulfuric acid;Nws tuaj yeem tau txais los ntawm kev sib pauv hloov pauv nrog cation txauv resin ua catalyst.Cov ntsiab lus ntawm diethyl maleate hauv cov khoom lag luam yog ≥98%, thiab txhua tuj ntawm cov khoom siv 585kg ntawm txiv neej anhydride (95%) thiab 604kg ethanol (95%).
2. Nws txoj kev npaj yog tsim los ntawm esterification ntawm maleic anhydride thiab ethanol nyob rau hauv lub xub ntiag ntawm sulfuric acid.Cov txheej txheem no muaj ob hom atmospheric siab nrog benzene esterification thiab tsis zoo siab yam tsis muaj benzene esterification.
(1) Atmospheric siab nrog benzene esterification
Ntxiv ib qho nyiaj ntawm benzene thiab ethanol rau cov tshuaj tiv thaiv esterification lauj kaub, muab tso rau hauv cov txiv neej anhydride, ntxiv cov concentrated sulfuric acid dropwise nyob rau hauv nplawm, kub los ntawm jacketed chav, thiab ua rau cov reactants undergo esterification cov tshuaj tiv thaiv ntawm txog 75 ℃.Cov dej tsim tawm raug tshem tawm los ntawm ternary azeotropic distillation nrog benzene thiab ethanol, thiab cov txheej txheem sab saud ntawm benzene thiab ethanol kua yog refluxed rau lub lauj kaub tshuaj.Txog 13 ~ 14h tom qab ntawd, thaum lub distillation ntauwd kub nce mus rau 68.2 ℃, lub separator qis dej theem tsis nce lawm, qhia tias tag nrho cov dej hauv cov tshuaj tiv thaiv lauj kaub tau evaporated, cov tshuaj tiv thaiv esterification tiav.Nres reflux, txuas ntxiv distillation mus rau 95-100 ℃, distillation ntawm benzene thiab ethanol.Txias mus txog 50 ℃, nruab nrab nrog 5% aqueous sodium carbonate tov, ntxuav nrog dej thiab tshem tawm cov seem benzene thiab ethanol nyob rau hauv lub tshuab nqus tsev kom tau cov khoom diethyl maleic acid.
(2) Tsis zoo siab benzene-dawb esterification
Esterification ntawm maleic anhydride thiab ethanol nyob rau hauv qhov kev txiav txim ntawm sulfuric acid yog nqa tawm nyob rau hauv ib tug tej yam nqus tsev vacuum thiab kub kom coj tawm cov ethanol thiab cov dej generated los ntawm cov tshuaj tiv thaiv nyob rau hauv lub gaseous lub xeev, thiab ces cov ethanol yog sib cais los ntawm cov fractionation kem rau reflux. esterification, kom cov tshuaj tiv thaiv zoo li ua tiav.Txoj kev no tuaj yeem ua rau lub voj voog luv luv, txhim kho cov txiaj ntsig thiab cov khoom lag luam zoo, txhim kho kev ua haujlwm ib puag ncig, feem ntau cov nroj tsuag hauv tsev siv cov qauv no.
Tsis tas li ntawd, cation txauv resin kuj tseem siv tau los ua cov khoom siv rau kev hloov pauv hloov los tsim cov tshuaj diethyl maleic acid.
Refining txoj kev: ntxuav nrog dilute poov tshuaj carbonate tov, ziab nrog anhydrous potassium carbonate los yog sodium sulfate thiab distillation nyob rau hauv txo siab.
