Abstract:
본 발명은 에틸렌카보네이트와 메탄올의 에스테르 교환반응과 생성된 디메틸카보네이트의 증류가 동시에 이루어지는 반응증류탑 충진용 펠릿형 K/MgO 촉매의 제조방법에 관한 것으로서, 더욱 상세하게는 촉매 지지체로서 마그네시아(MgO)를 펠릿상으로 성형하여 소성하는 방법과 성형된 MgO 펠릿의 표면 및 기공에 칼륨(K) 성분을 담지하여 소성하는 방법을 특이성 있게 수행하여 제조됨으로써 반응증류탑 내의 고정층 충진물겸 촉매로서 우수한 성능을 보이는 펠릿형 K/MgO 불균일촉매의 제조방법에 관한 것이다.
Abstract:
본 발명은 탄화수소와 이산화탄소의 내부개질반응(Internal Reforming)용 고체산화물 연료전지에 관한 것으로서, 더욱 상세하게는 고체 산화물 전해질(YSZ)의 한쪽 면에 공기극(La 0.8 Sr 0.2 MnO 3 )이 부착되어 있고, 다른 한쪽 면에는 Ni-YSZ계 또는 페롭스카이트계 금속 산화물의 촉매전극(anode)이 부착되어 있는 고체산화물 연료전지로서, 전기화학적 전환반응시스템에 적용되어서는 상기 촉매전극(anode) 내부에서 탄화수소와 이산화탄소의 내부개질반응이 진행되고 동시에 전기화학적 전환반응에 의해 합성가스(syngas)와 전기에너지(electricity)를 동시에 생성시키게 되며, 특히, 탄소침적 현상이 억제되어 탄소침적에 의한 촉매의 비활성화 및 고에너지 소모의 문제점을 동시에 해결할 수 있는 장점을 가지고 있다.
Abstract:
PURPOSE: A process for preparing hexafluoropropylene oxide from hexafluoropropylene and sodium hypochlorite is provided, thereby rapidly and selectively preparing the hexafluoropropylene oxide in higher yields. CONSTITUTION: A process for preparing hexafluoropropylene oxide from hexafluoropropylene and sodium hypochlorite comprises the steps of: (1) mixing an organic solvent with a sodium hypochlorite(NaOCl) solution; (2) adding a phase shift catalyst and an oxidation catalyst into the mixture; (3) cooling the mixture to -20 to 0 deg. C, followed by vacuum pumping it to remove air, and dissolving hexafluoropropylene(HFP) in it; (4) reacting the mixture at -20 to 0 deg. C; and (5) slowly increasing temperature of the mixture from -20-0 deg. C to 40-60 deg. C, wherein the phase shift catalyst is halogenide of quaternary ammonium salt(R-tetraammonium-X), in which R is C2-7 of alkyl and X is Cl, Br or I; and the oxidation catalyst is transition metal chloride.
Abstract:
PURPOSE: A cooling fluid composition for low temperature is provided, to obtain a novel cooling fluid composition which contains no CFC and HCFC and can replace R-502 destroying the ozone layer. CONSTITUTION: The cooling fluid composition comprises 10-60 wt% of difluoromethane (CH2F2, HFC-32); 5-75 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 15-35 wt% of 1,1,2,2-tetrafluoroethane (CHF2CHF2, HFC-134). Also the cooling fluid composition comprises 10-70 wt% of difluoromethane (CH2F2, HFC-32); 10-82 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 8-20 wt% of 1,1-difluoroethane (CH3CHF2, HFC-152a).
Abstract:
PURPOSE: A gasoline reforming catalyst for fuel cell automobiles is provided, which has high catalyst activity, high hydrogen selectivity and low CO selectivity and has improved durability against carbon deposition or sulfur poisoning, and a preparation method of the same is provided. CONSTITUTION: The gasoline reforming catalyst for fuel cell automobiles is characterized in that the catalyst is manufactured by supporting 5 to 15 wt.% of Mg as a base catalyst constituent and two or more transition metals selected from transition metal group consisting of 2 to 15 wt.% of Ni, 0.1 to 15 wt.% of Co, 2 to 15 wt.% of Fe, 2 to 15 wt.% of Mo, 0.1 to 1.0 wt.% of Cr, 0 to 0.005 wt.% of Ti and 0 to 0.005 wt.% of Zr as active catalyst constituents onto a porous support of γ-alumina or silica-alumina(Si-Al), wherein content of the porous support is 21 to 42 wt.% based on the metal weight.
Abstract:
PURPOSE: A method for preparing diphenyl carbonate is provided, to obtain diphenyl carbonate used as a source material of polycarbonate with a high yield in a wider temperature range within a short time with minimizing side reaction. CONSTITUTION: The method comprises the step of reacting dimethyl carbonate and phenol in a catalyst which is a mixture of an organic tin compound represented by R2SnO and a sulfuric acid derivative represented by R¬1SO3H, R is an alkyl group of C1-C6 or a phenyl group; and R1 is a halogen atom, an alkyl group of C1-C6, a haloalkyl group of C1-C6 or a tolyl group. Preferably the content of the catalyst is 0.1-10 mol% based on the amount of dimethyl carbonate; the molar ratio of the sulfuric acid derivative to the organic tin compound is 2-20; reaction temperature is 130-250 deg.C; and the reaction time is 1-24 hours.
Abstract:
PURPOSE: A mixture coolant composition is provided, which can replace chlorodifluoromethane(CHClF2, referred as HCFC-22), does not destroy an ozone layer and is used in a refrigerator and an air conditioner for a car. CONSTITUTION: The mixture coolant composition comprises 50-60 wt% of difluoromethane(HFC-32); 10-30 wt% of 1,1,1,2-tetrafluoroethane(HFC-134a); 10-20 wt% of 1,1,1,2,3,3,3,-heptafluoropropane(HFC-227ea); and 5-15 wt% of isobutane(R-600a). The mixture coolant composition comprises 50-70 wt% of HFC-32; 10-30 wt% of HFC-134a; 10-20 wt% of HFC-227ea; and 5-15 wt% of 1,1,1,2,3,3-hexafluoropropane(HFC-2363a). The mixture coolant composition comprises 50-70 wt% of HFC-32; 10-30 wt% of HFC-134a; 10-20 wt% of HFC-227ea; and 5-12 wt% of butane(R-600). Also the mixture coolant composition comprises 40-70 wt% of HFC-32; 10-40 wt% of 1,1-difluoroethane(HFC-152a); 10-20 wt% of HFC-227ea; and 5-15 wt% of one selected from the group consisting of R-600a. The mixture coolant composition comprises 50-70 wt% of HFC-32; 10-40 wt% of HFC-152a; 10-20 wt% of HFC-227ea; and 5-15 wt% of HFC-2363a. The mixture coolant composition comprises 40-70 wt% of HFC-32; 10-40 wt% of HFC-152a; 10-20 wt% of HFC-227ea; and 5-12 wt% of R-600.
Abstract:
본발명은제1 성분으로서디플루오로메탄(CHF, 이하 HFC-32), 제2 성분으로서펜타플루오로에탄(CHFCF, 이하 HFC-125), 제3 성분으로서 1,1,1,2-테트라플루오로에탄 (CHFCF, 이하 HFC-134a)을포함하고, 제4 성분으로서사이클로프로판 (CH, 이하 RC-270), 1,1-디플루오로에탄(CHCHF, 이하 HFC-152a), 1,1,1,2,3,3,3-헵타플루오로프로판 (CFCHFCF, 이하 HFC-227ea), 1,1,1,2,2-펜타플루오로프로판 (CHCFCF, 이하 HFC-245cb), 옥타플루오로사이클로부탄 (CF, 이하 RC-318), 1,1,1,2,3,3-헥사플루오로프로판(CHFCHFCF, 이하 HFC-236ea), 비스(디플루오로메틸)에테르(CHFOCHF, 이하 HFE-134), 펜타플루오로에틸메틸에테르(CFCFOCH, HFE-245), n-펜탄(CH, 이하 R601), 이소펜탄((CH)CHCHCH, 이하 R-601a) 중한 성분을포함하는 HCFC-22 대체용새로운냉매혼합물에관한것이다. 본발명에따른냉매혼합물은오존층파괴의위험이전혀없으면서동등한작용효과를보유하여 HCFC-22 대체냉매로서사용할수 있다.
Abstract:
본 발명은 제 1 성분으로 디플루오로메탄(CH 2 F 2 , 이하 HFC-32), 제 2 성분으로 1,1-디플루오로에탄(CH 3 CHF 2 , HFC-152a)를 포함하고, 제 3 성분으로 1,1,1,2,3,3,3-헵타플루오로프로판(CF 3 CHFCF 3 , HFC-227ea), 이소부탄(CH(CH 3 ) 2 CH 3 , R-600a), 1,1,1,2,3,3-헥사플루오로프로판(CHF 2 CHFCF 3 , HFC-236ea), 부탄(C 4 H 10 , R-600), 비스(디플루오로메틸)에테르(CHF 2 OCHF 2 ,HFE-134) 및 펜타플루오르에틸메틸에테르(CF 3 CF 2 OCH 3 , HFE-245)로 이루어진 군 중에서 선택된 어느 한 성분을 포함하는 HCFC-22 대체용 냉매 혼합물을 제공한다.