120-93-4

Ethylidene urea, tseem hu ua cyclic ethyl urea, yog cov organic raw khoom nrog cov mis molecular ntawm C3H8N ₂ O thiab molecular hnyav ntawm 88.1084. Khaws kom deb ntawm qhov hluav taws kub thiab qhov cua sov, kaw thiab khaws cia hauv qhov chaw txias, qhuav, thiab tiv thaiv kom tsis txhob ya raws.

Npe npe: 2-Imidazolidinone, Xyaum.; Ethylenurea hemihydrate; 2-Imidazolidone; 2-Imidazolidinone; Ethylenurea; 2-Imidazolidone; Imidazolidone; Ethylene urea; Imidazolidin-2-ib qho; urea - ether (1: 1)

CAS nrr: 120-93-4

Cov mis mos molecular: C3H8N2O

Molecular hnyav: 88.1084

Cov ntaub ntawv ntawm lub cev

Melting _point 129-132 degree
flash _ taw tes 265 degree
Dej_ soluble soluble

Txoj kev khaws cia

Khaws kom deb ntawm qhov hluav taws kub thiab qhov cua sov, kaw thiab khaws cia hauv qhov chaw txias, qhuav, thiab tiv thaiv kom tsis txhob ya raws.

txheej txheem hluavtaws

1. Kev sib xyaw ua ke siv ethylenediamine thiab urea ua raw khoom

Pub ratio (mass) ethylenediamine: urea: additive{{0}}: (0.8~0.9): (0.3~0.5)

Ntxiv urea, ethylenediamine, thiab additives nyob rau hauv kev faib ua feem rau lub reactor thiab maj mam cua sov mus rau boil. Tom qab 0.5 teev, ua kom sov ntxiv (tus nqi cua sov yuav tsum tau tswj) kom maj mam rov qab cov additives thiab tshaj ethylenediamine kom txog rau thaum cov tshuaj tiv thaiv kub nce mus txog 250, thiab tag nrho lub sij hawm yog tswj ntawm li 5 teev. Khaws ntawm 250 degree rau 2 teev, ces txias thiab recrystallize kom tau dawb 2-imidazolidone. Nws cov ntsiab lus melting yog 131 ~ 134 degree, thiab cov txiaj ntsig tau ntau dua 95%.

2. Ib txoj kev sib txuas siv ethylenediamine thiab urea ua raw khoom

Pub ratio (molar ratio) urea: ethylene glycol=4:1

Ntxiv urea thiab ethylene glycol cais rau hauv cov tshuaj tiv thaiv hlab ntsha, pib nplawm, thiab maj mam nce qhov kub ntawm 160-180 degree hauv 6.5 teev; Ua kom sov cov reactants rau 240 degree rau lwm 3 teev. Tom qab ntawd, cov khoom nyoos tau txais los ntawm nplawm thiab ua haujlwm ntawm 240 degree rau 1 teev. Cov khoom siv raw khoom tau raug rau lub tshuab nqus tsev yooj yim kom tau txais cov khoom lag luam zoo nrog cov txiaj ntsig ntawm kwv yees li 25% (xws li ethylene glycol).

3. Ib txoj kev sib txuas siv cov pa roj carbon monoxide, sulfur, thiab ethylenediamine ua raw khoom

Ntxiv 30g ntawm ethylenediamine, 16g ntawm sulfur, thiab 30ml ntawm methanol rau 1.8L stainless hlau siab-siab nkoj, thiab qhia carbon monoxide kom txog thaum nws nce mus txog 0.9MPa ua ntej nres. Tshav kub txog 100 degree thiab teb rau 2 teev. Tom qab ntawd txias, tso tawm hydrogen sulfide, yaug cov seem nrog methanol, txias ntxiv, thiab lim kom tshem tawm cov sulfur ntau dhau. Concentrate lub filtrate rau 75-100ml, txias, precipitate crystals, ces lim thiab qhuav kom tau 22.4g ntawm 2- imidazolidone, nrog ib tug melting point ntawm 131 degree thiab yield ntawm 58%.

4. Ib txoj kev sib txuas siv phosgene thiab ethylenediamine ua raw khoom

Ntxiv 100ml dej thiab 12g ntawm ethylenediamine mus rau 300ml plaub caj dab lub raj mis uas muaj ib tug drip funnel, reflux condenser raj, vent tube, thiab mechanical stirring, thiab pib stirring. Txhaj phosgene rau hauv cov hlab ntsha ntawm qhov ceev ntawm 10g / h los ntawm cov yeeb nkab, thiab ntxiv 20% sodium hydroxide aqueous tov dropwise. Tswj cov tshuaj tiv thaiv kub ntawm 20 degree. Tom qab 2 teev, nres cov phosgene ntws thiab txuas ntxiv stirring ntawm 20 degree rau 1 teev. Tom qab cov tshuaj tiv thaiv tiav lawm, lub tshuab nqus tsev distillation yog nqa tawm, thiab cov residue yog recrystallized nrog chloroform, nrog ib tug tawm los ntawm ntau tshaj 80%. Melting point 131 degree.

5. Lwm txoj kev sib xyaw ua ke koom nrog cov tshuaj tiv thaiv ntawm ethyl carbonate nrog ammonia; COS reacts nrog ethylenediamine; Hydrolysis ntawm ethyl diisocyanate; Catalytic hydrogenation ntawm diethyl urea acetate, thiab lwm yam.