-
公开(公告)号:KR1020040034183A
公开(公告)日:2004-04-28
申请号:KR1020020064268
申请日:2002-10-21
Applicant: 한국과학기술연구원
IPC: C07C68/06
Abstract: PURPOSE: A method for preparing dimethyl carbonate by using a potassium-supported catalyst is provided, to allow dimethyl carbonate to be produced in a short time with a high yield even under a mild condition. CONSTITUTION: The method comprises the step of ester exchange reacting ethylene carbonate and methanol in the presence of a catalyst to prepare dimethyl carbonate represented by the formula 1, wherein the catalyst is a potassium-containing magnesium oxide (K/MgO). Preferably the amount of potassium is 1.0-10 wt% based on the total weight of the catalyst and the K/MgO catalyst is used after sintered at a temperature of 55-600 deg.C. Preferably the ester exchange reaction is carried out at a temperature of 80-100 deg.C.
Abstract translation: 目的:提供通过使用负载钾的催化剂制备碳酸二甲酯的方法,即使在温和条件下也可以在短时间内以高产率生产碳酸二甲酯。 方案:该方法包括在催化剂存在下使碳酸亚乙酯和甲醇进行酯交换反应,制备式1表示的碳酸二甲酯,其中催化剂为含钾氧化镁(K / MgO)。 优选地,基于催化剂的总重量,钾的量为1.0-10重量%,并且在55-600℃的温度下烧结后使用K / MgO催化剂。 优选地,酯交换反应在80-100℃的温度下进行。
-
公开(公告)号:KR100522781B1
公开(公告)日:2005-10-19
申请号:KR1020020064268
申请日:2002-10-21
Applicant: 한국과학기술연구원
IPC: C07C68/06
Abstract: 본 발명은 칼륨 담지 촉매를 이용한 디메틸카보네이트의 제조방법에 관한 것으로서, 더욱 상세하게는 칼륨이 담지된 마그네슘옥사이드(K/MgO)의 불균일 촉매 존재하에서 에틸렌카보네이트를 메탄올으로 에스테르 교환반응시켜 온화한 반응 조건에서도 짧은 시간에 높은 수율로 디메틸카보네이트를 제조하는 방법에 관한 것이다.
본 발명에 따른 칼륨이 담지된 마그네슘옥사이드(K/MgO) 촉매는 칼륨(K) 담지량을 1.0 ∼ 10 중량%로 하고 소성온도를 550 ∼ 600
℃로 하여 제조된 불균일계 촉매로, 에스테르 교환반응에 사용되어서는 100 ℃ 이하의 낮은 온도에서 높은 촉매 활성을 나타내며 1시간 이내에 50% 이상의 전환율을 나타내고, 반응 후에는 별도의 촉매분리 및 회수공정이 필요로 하지 않는 우수성이 있다.-
公开(公告)号:KR1020040082067A
公开(公告)日:2004-09-24
申请号:KR1020030016683
申请日:2003-03-18
Applicant: 한국과학기술연구원
IPC: C09K5/04
CPC classification number: C09K5/045 , C09K2205/122 , C09K2205/22 , C09K2205/47
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 translation: 目的:提供一种用于低温的冷却液组合物,以获得不含CFC和HCFC的新型冷却液组合物,可代替破坏臭氧层的R-502。 构成:冷却液组合物包含10-60重量%的二氟甲烷(CH 2 F 2,HFC-32); 5-75重量%的五氟乙烷(CHF 2 CF 3,HFC-125); 和15-35重量%的1,1,2,2-四氟乙烷(CHF 2 CHF 2,HFC-134)。 冷却流体组合物还包含10-70重量%的二氟甲烷(CH 2 F 2,HFC-32); 10-82重量%的五氟乙烷(CHF 2 CF 3,HFC-125); 和8-20重量%的1,1-二氟乙烷(CH 3 CHF 2,HFC-152a)。
-
公开(公告)号:KR1020040082066A
公开(公告)日:2004-09-24
申请号:KR1020030016682
申请日:2003-03-18
Applicant: 한국과학기술연구원
IPC: C09K5/04
CPC classification number: C09K5/045 , C09K2205/12 , C09K2205/122 , C09K2205/47
Abstract: PURPOSE: A cooling fluid composition 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 5-32 wt% of difluoromethane (CH2F2, HFC-32); 5-60 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 35-63 wt% of cyclopropane (C3H6, RC-270). Also the cooling fluid composition comprises 2-15 wt% of difluoromethane (CH2F2, HFC-32); 8-40 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 55-70 wt% of propane (C3H6, R-290).
Abstract translation: 目的:提供一种冷却液组合物,以获得不含CFC和HCFC的新型冷却液组合物,可代替破坏臭氧层的R-502。 构成:冷却液组合物包含5-32重量%的二氟甲烷(CH 2 F 2,HFC-32); 5-60重量%的五氟乙烷(CHF 2 CF 3,HFC-125); 和35-63重量%的环丙烷(C 3 H 6,RC-270)。 冷却流体组合物还包含2-15重量%的二氟甲烷(CH 2 F 2,HFC-32); 8-40重量%的五氟乙烷(CHF 2 CF 3,HFC-125); 和55-70重量%的丙烷(C 3 H 6,R-290)。
-
-
-