Maleic anhydride CAS: 108-31-6

zvakasikwa

Pokunyunguduka 51-56°C (lit.)

Pokufashaira 200°C (yakapfava)

Kuwanda kwehuwandu 1.48 Kuwanda kwehuwandu 700-800kg/m3

Kuwanda kwemhepo ine utsi 3.4 (vsair)

Kumanikidzwa kwemhepo 0.16mmHg (20°C)

Chiratidzo cheRefractive 1.4688 (fungidziro)

Pokupenya kwechiedza 218°F

Maleic anhydride, inozivikanwawo se "maleic anhydride", ianhydride ye maleic acid. Isimbi isina ruvara kana chena ine kuravira kwakakora patembiricha yemumba, ine molecular formula ye C4H2O3. Kurema kwemolecular 98.06. Makristasi akaita setsono anowanikwa kubva ku chloroform kana ether. Nzvimbo yekunyunguduka 60℃, nzvimbo yekufashaira 82℃ (1.Chemicalbook8665kPa), huwandu hwe1.31460. Inonyunguduka muacetone, chloroform, ether, inonyunguduka zvishoma mu petroleum ether. Inonyunguduka mumvura kuti igadzire cis-butenedioic acid, inonyungudutswa mualcohol kuti igadzire esters, uye inogona kuita nemakomponi ane conjugated double bonds kuti igadzire diene synthesis. Ine chepfu, inogumbura zvakanyanya mucous membranes.

Mashandisirwo:

Inoshandiswa sezvinhu zvekugadzira 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, nezvimwewo. Inoshandiswawo mukurapa nemishonga yezvipembenene.

Nzira dzekugadzira

Nzira huru dzekugadzira maleic anhydride ndedzekuti benzene oxidation, butene oxidation uye n-butane oxidation, asi benzene oxidation ndiyo nzira huru. 1. Benzene oxidation method Benzene inopinda mu oxidation reaction mumubhedha wakatarwa pasi pechiito cheV-Mo-P series catalyst kugadzira maleic anhydride, uye tembiricha ye reaction i365°C (mubhedha we reaction unogona zvakare kushandisa mubhedha unofashaira, asi kushandiswa kweChemicalbook kwakanyanya). Zvadaro inonyudzwa nemvura kuti ibudise maleic acid, uye ipapo azeotropic dehydration uye distillation zvinoitwa, uye chigadzirwa chakapedzwa chinowanikwa ne scraping. 2. Butane (kana butene) oxidation method Butane (kana butene) inonyudzwa nemhepo kana oxygen pasi pechiito cheV-Mo catalyst kugadzira maleic anhydride, uye tembiricha ye reaction i350-400°C. Zvadaro inonyudzwa nemvura, inobviswa mvura uye inonatswa kuti iwane chigadzirwa chakapedzwa.

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