Maleic anhydride CAS: 108-31-6

chilengedwe

Malo osungunuka 51-56°C (lit.)

Kutentha kwa 200°C (lit.)

Kuchulukana 1.48 Kuchulukana 700-800kg/m3

Kuchuluka kwa nthunzi 3.4 (vsair)

Kuthamanga kwa nthunzi 0.16mmHg (20°C)

Chizindikiro cha Refractive 1.4688 (chiyerekezo)

Malo owunikira 218°F

Maleic anhydride, yomwe imadziwikanso kuti "maleic anhydride", ndi anhydride ya maleic acid. Ndi chinthu cholimba chopanda mtundu kapena choyera chokhala ndi kukoma kowawasa kutentha kwa chipinda, chokhala ndi formula ya molekyulu ya C4H2O3. Kulemera kwa molekyulu 98.06. Makristalo ooneka ngati singano amapezeka kuchokera ku chloroform kapena ether. Malo osungunuka 60℃, malo owira 82℃ (1.Chemicalbook8665kPa), kuchuluka kwachibale 1.31460. Amasungunuka mu acetone, chloroform, ether, amasungunuka pang'ono mu petroleum ether. Amasungunuka m'madzi kuti apange cis-butenedioic acid, amasungunuka mu mowa kuti apange ma esters, ndipo amatha kuchitapo kanthu ndi mankhwala okhala ndi ma conjugated double bonds kuti apange diene synthesis. Ndi poizoni, amakwiyitsa kwambiri nembanemba ya mucous.

Ntchito:

Amagwiritsidwa ntchito ngati zopangira popanga 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, ndi zina zotero. Amagwiritsidwanso ntchito mu mankhwala ndi mankhwala ophera tizilombo.

Njira zopangira

Njira zazikulu zopangira maleic anhydride ndi benzene oxidation, butene oxidation ndi n-butane oxidation, koma benzene oxidation ndiyo njira yayikulu. 1. Njira ya oxidation ya benzene Benzene imadutsa mu oxidation reaction mu bedi lokhazikika pansi pa ntchito ya V-Mo-P series catalyst kuti ipange maleic anhydride, ndipo kutentha kwa reaction ndi 365°C (bedi la reaction lingagwiritsenso ntchito bedi lowira, koma kugwiritsa ntchito Chemicalbook kumakhala kokwera). Kenako imayamwa ndi madzi kuti ipange maleic acid, kenako madzi ochulukirapo ndi kusungunuka kumachitika, ndipo chinthu chomalizidwa chimapezeka pokanda. 2. Njira ya oxidation ya butane (kapena butene) Butane (kapena butene) imayamwa ndi mpweya kapena mpweya pansi pa ntchito ya V-Mo catalyst kuti ipange maleic anhydride, ndipo kutentha kwa reaction ndi 350-400°C. Kenako imayamwa ndi madzi, imaphwanyidwa ndi madzi ndikuyengedwa kuti ipeze chinthu chomalizidwa.

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