CAS: 1111-78-0; Ammonium Carbamate

上下游产品

benzophenone semicarbazone Tyr methylammonium carbonate glycineurea 5,5-dimethyl-imidazolidine-2,4-dione acetamideN,O-bis(trimethylsilyl)oxyacetamide (S)-7-Benzyl-2,4-dioxo-1,3,7-triaza-spiro[4.4]nonane-8-carboxylic acid ethyl ester

二氧化碳置于氨体系中,化学反应 8.0H,以90%的收率获得氨基甲酸铵
参考文献:铜(II)配合物从氨基甲酸铵催化合成尿素的实验研究和理论研究相结合
标题:铜(II)配合物从氨基甲酸铵催化合成尿素的实验研究和理论研究相结合
摘要:目前,尿素肥料的合成是行业中最大的co 2转化过程.在这个过程中,氨基甲酸铵是中间途中到脲形成.我们确定硫酸四氨水合铜(II)络合物[cu(nh 3)4(oh 2)] So 4催化了氨基甲酸铵在水溶液中形成尿素.15 H后在高压金属反应器中于120oc获得的尿素收率高达18+/-6%.没有催化剂,没有形成明显的尿素.通过傅立叶变换红外(ft-Ir),粉末x射线衍射(pxrd)和定量1 H { 131 C NMR分析.然后,在反应结束时以[%]的回收率回收了[cu(nh 3)4(oh 2)] So 4催化剂,这已通过ft-Ir,Pxrd和定量uv-Vis光谱法进行了验证.开发了一种使用co 2的沉淀方法来回收和再利用66+/-3%的cu(II).通过密度泛函理论在b3Lyp / 6-31G **水平上使用smd连续溶剂模型研究了催化机理.我们确定[cu(nh 3)4 ] 2+络合物可能是有效的催化剂
Doi:10.1021/acs.Inorgchem.0C03467

专利信息

专利号:WO-2025125181-A1
优先权日:2023-12-14
标题:Green hydrogen, synthesis gas with a reduced nitrogen content, and flue gas for the synthesis of ammonia and urea
发明人：GORVAL EVGENI
权利人:THYSSENKRUPP UHDE GMBH; THYSSENKRUPP AG
摘要:The invention relates to the synthesis of urea from ammonia and carbon dioxide, wherein the hydrogen required for ammonia synthesis is obtained both by steam reforming of feed natural gas (grey hydrogen) and by electrolysis of water using electricity from renewable energy sources (green hydrogen). As the proportion of green hydrogen increases, the amount of carbon dioxide formed in the synthesis gas during steam reforming is no longer sufficient for the synthesis of urea. Therefore, flue gas, which is formed during the combustion of a fuel gas composed of fuel natural gas and combustion air and which also contains carbon dioxide, is additionally used. The oxygen formed during the electrolysis of water is introduced into the flue gas, and the modified flue gas is fed to a secondary reformer; and/or the fuel natural gas is combusted together with combustion air and the oxygen formed during electrolysis. Excess nitrogen is preferably separated from the synthesis gas before it is used for the synthesis of ammonia.

专利号:US-11643387-B2
优先权日:2019-07-18
标题 :Process for the synthesis of urea
发明人：MARRONE LEONARDO; BERTINI PAOLO
权利人:CASALE SA
摘要:A process for synthesis of urea from ammonia and carbon dioxide comprising the synthesis of urea in parallel in a first urea reactor ( 1 ) at a first urea synthesis pressure and in a second urea reactor ( 2 ) at a second and lower urea synthesis pressure; a stripping step of the reaction effluent of the first reactor, which is performed in a stripper ( 4 ) operating at a stripping pressure lower than the first urea synthesis pressure; the reaction effluent ( 21 ) of the second reactor ( 2 ) and the stripper liquid effluent ( 11 ) are sent to a recovery section ( 13 ) where a carbamate-containing recycle solution ( 17 ) is produced, and said recycle solution ( 17 ) is sent partly to said first reactor and partly to said second reactor.

专利号:US-6093850-A
优先权日:1997-12-18
标题 :Process for the synthesis of urea and equipment therefor
发明人：KOJIMA YASUHIKO; FUJII HIDETSUGU
权利人:TOYO ENGINEERING CORP
摘要:The present invention provides an improved process for synthesizing urea from ammonia and carbon dioxide while preventing corrosion of sites, that are to be in contact with a condensate, of the joints of a tube plate and cooling tubes in a condenser installed vertically or horizontally. According to this process, the sites, that are to be in contact with the condensate, of the joints of the tube plate and the cooling tubes in the condenser are prevented from corrosion by enveloping the sites with liquid ammonia or a solution rich in ammonia in the synthesis of urea comprising separating unreacted ammonia and carbon dioxide as a gaseous mixture thereof from a urea synthesis solution at a pressure substantially equal to the urea synthesis pressure, bringing the gaseous mixture into contact with an absorption medium in the condenser to form a condensate, and recirculating the condensate to the synthesis column.

专利号:WO-2025125180-A1
优先权日:2023-12-14
标 题 :Green hydrogen, synthesis gas, and flue gas with a reduced nitrogen content for the synthesis of ammonia and urea
发明人：GORVAL EVGENI
权利人:THYSSENKRUPP UHDE GMBH; THYSSENKRUPP AG
摘要:The invention relates to the synthesis of urea from ammonia and carbon dioxide, wherein the hydrogen required for ammonia synthesis is obtained both by steam reforming of feed natural gas (grey hydrogen) and by electrolysis of water using electricity from renewable energy sources (green hydrogen). As the proportion of green hydrogen increases, the amount of carbon dioxide formed in the synthesis gas during steam reforming is no longer sufficient for the synthesis of urea. Therefore, flue gas, which is formed during the firing of the steam reformer and also contains carbon dioxide, is additionally used. After reducing the nitrogen content, the flue gas is fed into the reforming process. The carbon dioxide from the synthesis gas and the flue gas is combined, separated using conventional carbon dioxide scrubbing, and used for the synthesis of urea.

专利号:US-9957239-B2
优先权日:2014-04-28
标题 :Process and plant for the synthesis of urea and melamine
发明人：BERTINI PAOLO; DI CARLO GABRIELE
权利人:CASALE SA
摘要:An integrated process for the synthesis of urea and melamine, wherein: urea is synthesized with a stripping process in a high-pressure synthesis loop comprising a reactor, a stripper and a carbamate condenser, and the urea solution leaving said stripper is sent to a recovery section to produce a concentrated urea product and a recovered carbamate solution; at least part of said urea product is converted to melamine, and the off-gas from the synthesis of melamine are recycled to the urea synthesis by mixing with the gas phase from the stripper and with said recovered carbamate solution, thus forming a mixed flow which is then condensed in said carbamate condenser, and the condensate is eventually directed to the reactor.

专利号:US-2024075466-A1
优先权日:2021-04-09
标 题:One-Pot Synthesis of Transition Metal-Promoted Chabazites
发明人：VAN TENDELOO LEEN; SCHUETZE FRANK-WALTER; VERHEYEN ELKE JANE JUNE
权利人:UMICORE AG & CO KG
摘要:The invention provides methods for a one-pot synthesis of molecular sieves of the CHA-type. The method uses molecular and non-molecular sieves as sources of silicon and aluminum. A first OSDA is selected from tetraethylenepentamine (TEPA) and triethy-lenepentamine (TETA). The synthesis mixture comprises a first metal selected from copper, iron and zinc. Optionally, the synthesis mixture may furthermore comprise a second OSDA and/or a second metal selected from manganese, cesium, magnesium, calcium, strontium, barium, yttrium, titanium, zirconium, niobium, iron, zinc, silver, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and mixtures thereof. The molecular sieves of the CHA-type obtainable by the method can be used as SCR-catalytically active substances for the removal of nitrogen oxides from exhaust gases of combustion engines.