Txheej txheem cej luam:

Dimethyl carbonate, hu ua DMC, yog ib yam kua tsis muaj xim, pob tshab nrog ib qho tsw ntxhiab ntawm chav tsev kub. Qhov ceev ntawm qhov sib piv (d204) yog 1.0694, qhov melting point yog 4 ℃, qhov boiling point yog 90.3 ℃, thiab qhov flash point yog 21.7 ℃ (qhib) 16.7 ℃ (Kaw qhov ncauj), refractive index (nd2Chemicalbook0) 1.3687, flammable, tsis muaj tshuaj lom. Nws tuaj yeem sib xyaw nrog yuav luag txhua yam organic solvents xws li cawv, ketones, thiab esters hauv txhua qhov sib piv, thiab me ntsis soluble hauv dej. Siv tau ua methylating reagent. Piv rau lwm cov methylating reagents, xws li methyl iodide thiab dimethyl sulfate, dimethyl carbonate tsis muaj tshuaj lom thiab biodegradable.

Cov Khoom Siv Tshuaj

Tsis muaj xim thiab pob tshab kua nrog ntxhiab tsw qab. Insoluble hauv dej, soluble hauv cov organic solvents xws li ethanol thiab ether.

siv

1. Ib hom tshuaj tshiab uas tsis muaj tshuaj lom yuav hloov tau toluene, xylene, ethyl acetate, butyl acetate, acetone lossis methyl ethyl ketone thiab lwm yam tshuaj hauv kev lag luam pleev xim thiab nplaum. Nws yog ib yam tshuaj ntsuab uas zoo rau ib puag ncig.

2. Tus neeg sawv cev methylating zoo, tus neeg sawv cev carbonylating, tus neeg sawv cev hydroxymethylating thiab tus neeg sawv cev methoxylating. Nws yog siv dav hauv cov teb ntawm cov khoom noj khoom haus antioxidants, cov neeg sawv cev tiv thaiv cog thiab lwm yam teb. Nws yog cov khoom siv tshuaj lom neeg siv dav dav.

3. Ib qho kev hloov pauv zoo tagnrho rau cov tshuaj lom neeg xws li phosgene, dimethyl sulfate, Chemicalbook methyl chloroformate, thiab lwm yam.

4. Ua cov polycarbonate, diphenyl carbonate, isocyanate, thiab lwm yam.

5. Hauv tshuaj, nws yog siv los ua cov tshuaj tiv thaiv kev kis kab mob, tshuaj tiv thaiv mob kub hnyiab thiab tshuaj analgesic, tshuaj vitamin, thiab tshuaj siv rau lub paj hlwb.

6. Hais txog cov tshuaj tua kab, nws feem ntau yog siv los tsim cov methyl isocyanate, thiab tom qab ntawd los tsim cov tshuaj carbamate thiab cov tshuaj tua kab (anisole).

7. Cov khoom siv roj av, cov roj teeb lithium electrolyte, thiab lwm yam.

Txoj kev tsim khoom yog tau los ntawm kev sib xyaw methyl chloroformate thiab methanol. Cov khoom siv raw methyl chloroformate siv rau hauv kev sib xyaw yog tau los ntawm kev sib xyaw ntawm methanol thiab phosgene. Thaum lub sijhawm npaj, cov khoom phosgenation no kuj tseem tuaj yeem tsim los ntawm kev ntxiv methanol ntau dhau thiab rov ua dua qhov kev sib xyaw yam tsis muaj kev sib cais los ua kom dimethyl carbonate. Qhov kev sib xyaw saum toj no hu ua txoj kev phosgene ib txwm muaj hauv Chemicalbook. Txoj kev transesterification cuam tshuam nrog kev sib xyaw transesterification ntawm ethylene carbonate lossis propylene carbonate thiab methanol los tsim dimethyl carbonate. Txoj kev no muaj cov txiaj ntsig zoo, cov khoom siv corrosive tsawg, thiab cov xwm txheej tsis tshua muaj kev sib xyaw. Txawm li cas los xij, qhov chaw ntawm cov khoom siv raw raug txwv los ntawm kev txhim kho ntawm kev lag luam petrochemical thiab tus nqi siv cov ntsiab lus tsawg.

Cov Ntaub Ntawv Tiv Tauj