Abstract:
PURPOSE: A method for preparing an alkylene carbonate by using a quaternary ammonium zinc tetrahalide catalyst is provided to allow an alkylene carbonate to be obtained at a lower pressure and a lower temperature in a short time. CONSTITUTION: The method comprises the step of reacting an alkylene oxide and carbon dioxide in the presence of a catalyst which is a quaternary ammonium zinc tetrahalide represented by £R1R2R3R4N|2ZnXnY(4-n), wherein R1, R2, R3 and R4 which are identical or different one another represent a linear or branched alkyl group of C1-C18, an aryl group of C6-C12 or an aralkyl group of C7-C12; X and Y which are identical or different each other represent Cl, Br or I; and n is an integer of 1-4. Preferably the reaction is carried out at a temperature of 60-140 deg.C and a pressure of 10-100 atm. In the case that the reaction is carried out in a solvent, the solvent is ethylene carbonate or propylene carbonate. Preferably the alkylene oxide is represented by the formula 2, wherein R5 and R6 are identical or different each other and are an alkyl group of C1-C4 or a phenyl group.
Abstract:
PURPOSE: Provided is a production method of alkylene carbonates by reacting alkylene oxide and carbon dioxide, in high yield within a short period of time. CONSTITUTION: The production method of alkylene carbonate of the formula(2) is characterized by reacting alkylene oxide and carbon dioxide using a catalyst such as a zinc compound having a bridged ligand consisting of a pyrimidine compound of the formula(1): Znn(μ-OR)nX2n and alkylene oxide and halogen ion as a ligand. In the formula(1), R is a compound consisting of ethylene oxide and pyrimidine compound, X is a halogen atom selected from the group consisting of Cl, Br, I, and n is an integer of 2 or 3. In the formula(2), R1 and R2 are independently hydrogen, a C1-4 alkyl group or a phenyl group.
Abstract:
PURPOSE: A highly activated catalyst for synthesizing alkylene carbonate is provided to synthesize alkylene carbonate at low temperature and pressure in good yield and easily separate the catalyst from the product. CONSTITUTION: When preparing alkylene carbonate, which is expressed by Formula 2, by reacting alkylene oxide with carbon dioxide, a catalyst expressed by LmMXn(Formula 1) is used. In Formula 1, L is pyridine compound; M is an atom selected from Zn, Fe, Mn, Pb and In; X is a halogen atom selected from Cl, Br and I; m is 1 or 2; and n is 2 or 3. The pyridine compound L can have the structure of Formulas 3, 4 or 5. The metal halide compound MXn can be ZnX2, FeX2, FeX3, MnX2, PbX2 or InX3.
Abstract:
PURPOSE: A refrigerants mixture containing HFC-32, HFC-125, HFC-134A is provided to substitute HCFC-22(chlorodifluoromethane, CHClF2) by maintaining identical working effect without risk of ozone layer destruction. CONSTITUTION: The refrigerant mixture comprises difluoromethane(CH2F2, HFC-32) as first component; pentafluoroethane(CHF2CF3, HFC-125) as second component; 1,1,1,2-tetrafluoroethane(CH2FCF3, HFC-134A) as third component; one component selected from cyclopropane(C3H6, RC-270), 1,1-difluoroethane(CH3CHF2, HFC-152a), 1,1,1,2,3,3,3-heptafluoropropane(CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), octafluorocyclobutane(C4F8, RC-318), 1,1,1,2,3,3-hexafluoro propane(CHF2CHFCH3, HFC-236ea), bis(difluoromethyl)ether(CHF2OCHF2, HFE-134), pentafluoroethylmethylether (CF3CF2OCH3, HFE-245), n-pentane(C5H12, R601), isopentane((CH3)2CHCH2CH3, R601a) as fourth component.
Abstract:
M 2 SeO 3 , M 2 Se 2 O 5 및 (CH 3 O)SE(O)(OM)[M = Li, Na, K, Rb, 또는 Cs 중에서 선택된 알칼리 금속] 중에서 선택된 1종 이상의 셀레늄 촉매계의 존재하에서 아민을 알코올 및 CO/O 2 혼합가스와 반응시켜 카바메이트를 제조하는 방법.
Abstract:
PURPOSE: A refrigerant mixture added one component of HFC-236ea, R-600a and HFC-236ea to a mixture of HFC-32 and HFC-134a additionally is provided which exhibits performance similar to HCFC-22. CONSTITUTION: A refrigerant mixture free from ozonosphere destruction danger, which can be used as a substitute for chlorodifluoromethane(CHCIF2) comprises difluoromethane(CH2F2, HFC-32) as a first component, 1,1,1,2-tetrafluoroethane(CF3CH2F, HFC-134a) as a second component and one component selected from the group of 1,1,1,2,3,3,3-heptafluoropropane(CH3CHFCF3, HFC-236ea), isobutane(C4H10, R-600a) and 1,1,1,2,3,3-hexafluoropropane(CHF2CHFCF3, HFC-236ea) a third component. The composition of HFC-32, HFC-134a and HFC-227ea is 35 to 70% by weight, 5 to 60% by weight and 5 to 30% by weight respectively.
Abstract:
Cu[NCMe 4 ]X, K[CuX 2 ], [(CuX)(S)] n (X=Cl, Br, I ; S =용매)의 구조식 (X=Cl, Br, I)을 갖는 1가의 할로겐화 구리화합물, 또는 구조식[Cu(CO)X a L b ] m Y n (X=CF 3 CO 2 , Cl, HB(pz) 3 (pz = pyrazoyl, C 3 H 3 N 2 ), LBF 2 {LBF 2 = difluoro-3,3'-(trimethylenedinitrilo)bis(2-butanone oximato)borate}; L = en, diene; Y=BPh 4 , AsF 6 ; a,b =0, 1 ; m =1-4; n=0,1)의 카르보닐기 (Cu-CO)를 갖는 1가의 구리 화합물 중에서 선택된 1종 이상의 촉매 존재 하에서 아민을 알코올 및 CO/O 2 혼합가스와 반응시키는 것으로 되는 카바메이트류의 제조방법이 제공된다.