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    • 16. 发明授权
    • 이치환 우레아의 제조방법
    • 一种制备N,N'-DISUBSITED UREAS的方法
    • KR101088458B1
    • 2011-11-30
    • KR1020100051140
    • 2010-05-31
    • 한밭대학교 산학협력단
    • 이철우
    • C07C273/02C07C275/28B01J31/22
    • PURPOSE: A manufacturing method of a disubstituted urea is provided to improve the yield of a disubstituted urea and increase a reaction rate without causing side reactions. CONSTITUTION: A manufacturing method of N,N' disubstituted urea of chemical formula 1 comprises a step of reacting aromatic mononitro compound of chemical formula 2: Ar-NO2, aramatic primary amine and carbon monoxide, under the presence of nickel complex compound catalyst, and a moisture absorbent. In chemical formula 1 and 2, Ar is an unsubstituted aromatic group or a substituted aromatic group substituted by one or more substituents which are selected from a halogen, C1-4 alkyl and C1-4 alkoxy.
    • 目的:提供二取代尿素的制备方法以提高二取代脲的产率并提高反应速率而不引起副反应。 构成:化学式1的N,N'二取代脲的制造方法包括使化学式2的芳香族单硝基化合物:Ar-NO 2,芳族伯胺和一氧化碳在镍络合物催化剂存在下反应的步骤,以及 吸湿剂。 在化学式1和2中,Ar是未取代的芳基或被一个或多个选自卤素,C 1-4烷基和C 1-4烷氧基的取代基取代的取代芳基。
    • 17. 发明公开
    • 요소 제조 방법 및 관련 플랜트
    • 乌拉圭生产过程和相关工厂
    • KR1020070110118A
    • 2007-11-15
    • KR1020077022618
    • 2005-11-15
    • 우레아 카잘레 에스.에이.
    • 로미티,도메니코스티치,파올로
    • C07C273/04C07C273/02C07C273/14B01J19/24
    • C07C273/04B01J2219/00006B01J2219/00103B01J2219/00108B01J2219/182B01J2219/185Y02P20/142
    • A process for urea production from ammonia and carbon dioxide, made to react at a predetermined high pressure in an appropriate synthesis reactor (112), from the reaction between NH3 and C02 being obtained a reaction mixture comprising urea, ammonium carbamate and free ammonia in aqueous solution, from which a recovery of ammonium carbamate and ammonia is carried out with their subsequent recycle to the synthesis reactor (112), said recovery from the reaction mixture taking place through operative steps of decomposition of the ammonium carbamate into NH3 and CO2 and of their stripping and a subsequent operative step of their recondensation into ammonium carbamate that is recycled to the synthesis reactor, the said reaction mixture obtained from the reaction between ammonia and carbon dioxide being pumped to the operative steps of decomposition and stripping.
    • 由氨和二氧化碳制备的尿素在合适的合成反应器(112)中由NH 3和CO 2之间的反应在预定的高压下反应,得到包含尿素,氨基甲酸铵和游离氨水溶液的反应混合物 溶液,其中氨基甲酸铵和氨的回收率随后再循环到合成反应器(112)中,所述从反应混合物中回收,通过氨基甲酸铵分解成NH 3和CO 2以及它们的操作步骤进行 汽提和随后的将其再缩合成氨基甲酸铵再循环到合成反应器中的操作步骤,将从氨和二氧化碳之间的反应获得的所述反应混合物泵送到分解和汽提的操作步骤。
    • 18. 发明公开
    • 세미카바자이드 합성방법
    • 用于合成半胱氨酸的方法
    • KR1020010047480A
    • 2001-06-15
    • KR1019990051728
    • 1999-11-20
    • 동진홀딩스 주식회사
    • 이준혁한상진
    • C07C273/02
    • PURPOSE: A method for synthesizing semi-carbazide is provided which reduces manufacturing unit cost and provides excellent reaction efficiency and manufacturing yield by using cheap raw materials instead of using expensive hydrazine. CONSTITUTION: The semi-carbazide is synthesized by the reaction of halogenated urea and ammonia, and is represented by the following reaction formula (3) wherein, X is a halogen atom selected from chlorine, fluorine, bromine and iodine. In the method, the reaction is carried out at a temperature of 50-170 deg.C, the reaction mol of the ammonia is 1-1,000 times as that of the halogenated urea, the ammonia is ammonia gas, liquid ammonia or ammonia in aqueous solution, and the reaction solvent is a mixture solvent of water and a second solvent.
    • 目的:提供一种合成半卡巴肼的方法,其通过使用便宜的原料代替使用昂贵的肼来降低制造单位成本并提供优异的反应效率和制造产率。 构成:通过卤化脲和氨的反应合成半卡巴肼,由以下反应式(3)表示,其中X为选自氯,氟,溴和碘的卤素原子。 在该方法中,反应在50-170℃的温度下进行,氨的反应摩尔量为卤化脲的1-1000倍,氨为氨气,液氨或氨水溶液 溶液,反应溶剂是水和第二溶剂的混合溶剂。