Iimveliso
I-Diethyl Maleate
Ifomula yoLwakhiwo
Iipropati Zomzimba
Imbonakalo: ulwelo olungenambala olucacileyo
Uxinaniso: 1.064 g/mL ku-25 °C (lit.)
Indawo yokunyibilika: -10 °C (ilayiti.)
Indawo yokubila: 225 °C (lit.)
Ubuninzi bomphunga:5.93 (vs umoya)
Uxinzelelo lomphunga:1mm Hg (14°C)
Refractivity:n20/D 1.441 (lit.)
Indawo edanyazayo: 200°F
Idatha yoKhuseleko
Yeyempahla eqhelekileyo
Ikhowudi yeCustoms: 2917190090
Ixabiso lembuyekezo yeRhafu yangaphandle(%):9%
Isicelo
Isetyenziswa njengesibulali-zinambuzane esiphakathi ukulungiselela i-malathion, i-organophosphorus pesticide, kunye ne-intermediate yeyeza, i-perfume kunye ne-stabilizer yomgangatho wamanzi (i-organic polycarboxylic acid phosphonic acid compound).Isenokusetyenziswa njenge-solvent ye-resin kunye ne-nitrocellulose, i-plasticizer, i-organic synthesis, i-insecticide, i-polymer monomer kunye nomncedisi weplastiki.
Iipropati kunye nozinzo
Izinzile kwiqondo lokushisa kunye noxinzelelo.Izinto ezinqatshelwe: i-oxidizing agents, ii-agent zokunciphisa, i-acids, iziseko.Inokutshiswa, nikela ingqalelo kumthombo womlilo xa usebenzisa kwaye ugcina.Thintela ukuphefumla imiphunga kwaye ugweme ukudibana nolusu.
Indlela yokugcina
Gcina kwindawo epholileyo, eyomileyo kwaye engenamoya.Nika ingqalelo kumthombo womlilo xa usebenzisa kwaye ugcina.
Indlela yokudibanisa
1. Iveliswa nge-esterification ye-maleic anhydride kunye ne-ethanol phambi kwe-asidi ye-sulfuric;inokufumaneka kwakhona ngokuguqulwa kotshintshiselwano kunye ne-cation exchange resin njenge-catalyst.Umxholo we-diethyl maleate kwimveliso yoshishino ngu-≥98%, kwaye itoni nganye yemveliso idla i-585kg ye-anhydride ye-maleic (95%) kunye ne-604kg ye-ethanol (95%).
2. Indlela yayo yokulungiselela yenziwa ikakhulu nge-esterification ye-maleic anhydride kunye ne-ethanol phambi kwe-asidi ye-sulfuric.Le nkqubo ineendidi ezimbini zoxinzelelo lwe-atmospheric kunye ne-benzene esterification kunye noxinzelelo olubi ngaphandle kwe-benzene esterification.
(1) Uxinzelelo lwe-atmospheric kunye ne-benzene esterification
Yongeza umlinganiselo othile we-benzene kunye ne-ethanol kwi-esterification reaction pot, faka i-maleic anhydride, yongeza i-concentrated sulfuric acid dropwise phantsi kokuvuselela, ubushushu ngomphunga ofakwe ibhatyi, kwaye wenze iireactants zibe ne-esterification reaction malunga ne-75℃.Amanzi aveliswayo asuswa yi-ternary azeotropic distillation nge-benzene kunye ne-ethanol, kwaye umaleko ongaphezulu we-benzene kunye ne-ethanol liquid ihlaziywa kwi-reaction pot.Malunga ne-13 ~ 14h kamva, xa i-distillation tower iqondo lobushushu liphakama ukuya kuma-68.2 ℃, inqanaba elisezantsi lokwahlulahlula amanzi alisanyuki, nto leyo ebonisa ukuba onke amanzi akwimbiza yokusabela aye aphuphuma, ukusabela kwe-esterification kugqityiwe.Misa i-reflux, qhubeleka ne-distillation ukuya kwi-95-100 ℃, i-distillation ye-benzene kunye ne-ethanol.Phola ukuya malunga ne-50℃, yenza i-5% yesisombululo se-aqueous sodium carbonate, hlamba ngamanzi uze ususe intsalela yebenzene kunye ne-ethanol phantsi kwevacuum ukufumana imveliso ye-diethyl maleic acid.
(2) Uxinzelelo olubi lwe-benzene-free esterification
I-Esterification ye-anhydride ye-maleic kunye ne-ethanol phantsi kwesenzo se-asidi ye-sulfuric iqhutyelwa phantsi kwe-vacuum ethile kunye nobushushu ukukhupha i-ethanol kunye namanzi aveliswa yi-reaction kwimo yegesi, kwaye ke i-ethanol yahlulwe ngekholamu ye-fractionation ukuya kwi-reflux. i-esterification, ukwenzela ukuba ukusabela kuthande ukuphelela.Le ndlela inokunciphisa umjikelo wokuphendula, ukuphucula isivuno kunye nomgangatho wemveliso, ukuphucula indawo yokusebenza, izityalo ezininzi zemveliso yasekhaya zisebenzisa le ndlela.
Ukongeza, i-cation exchange resin inokusetyenziswa njenge-catalyst yokuguqulwa kotshintshiselwano ukuvelisa i-diethyl maleic acid.
Indlela yokucoca: ukuhlamba ngesisombululo se-potassium carbonate edibeneyo, ukomisa nge-anhydrous potassium carbonate okanye i-sodium sulfate kunye ne-distillation phantsi koxinzelelo oluncitshisiweyo.
