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1. 发明授权

US08313722B2 Process to produce ammonia from urea 有权
标题翻译：从尿素生产氨的工艺
公开(公告)号：US08313722B2
公开(公告)日：2012-11-20
申请号：US12963334
申请日：2010-12-08
申请人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
发明人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
IPC分类号： C01C1/08 , C01C1/02 , B01D53/56
CPC分类号： C01C1/086 , B01D2251/2062 , F01N3/208 , F01N2240/40 , F01N2610/02 , F01N2610/06 , F01N2610/10 , F01N2610/14 , F01N2900/1808 , F01N2900/1811 , F01N2900/1814 , Y02T10/24
摘要： In a process for producing ammonia from urea which process comprises: (a) heating a liquid phase reaction medium comprising an aqueous solution of urea, or a mixture of urea, containing biuret or ammonium carbamate on site, in a hydrolysis reactor such that a pressurized gaseous ammonia and carbon dioxide-containing product is obtained which is essentially free of urea, biuret, or ammonium carbamate; (b) separating the gaseous ammonia and carbon dioxide-containing product from the liquid phase reaction medium at the prevailing pressure; (c) retaining the liquid phase reaction medium in the reactor for further conversion to gaseous ammonia and carbon dioxide, and/or recycling at least a portion of the said reaction medium back into the reactor, a urea dissolver, or feed solution to the reactor for further conversion; and (d) withdrawing the gaseous ammonia and carbon dioxide-containing product separated in step (b) at a controlled rate to meet varying ammonia demand requirements; the improvement wherein the operating pressure of said reactor is set or adjusted such that excess water for the reaction is maintained in the reactor and the dew-point of said gaseous ammonia and carbon-dioxide-containing product is below the operating temperature of said reactor.
摘要翻译：在从尿素生产氨的方法中，该方法包括：（a）在水解反应器中加热含有尿素水溶液或含有缩二脲或铵氨基甲酸铵的尿素混合物的液相反应介质，使得加压得到基本上不含尿素，缩二脲或氨基甲酸铵的气态氨和二氧化碳的产物; （b）在主要压力下从液相反应介质中分离出含氨气和二氧化碳的产物; （c）将液相反应介质保留在反应器中用于进一步转化为气态氨和二氧化碳，和/或将至少一部分所述反应介质再循环回反应器，尿素溶解器或进料到反应器的溶液进一步转换和（d）以受控的速率取出在步骤（b）中分离的气态氨和二氧化碳的产品，以满足不同的氨需求要求; 改进之处在于其中设定或调整所述反应器的操作压力，使得在反应器中维持反应的过量水，并且所述气态氨和含二氧化碳的产物的露点低于所述反应器的操作温度。

2. 发明申请

US20110076222A1 Process to Produce Ammonia from Urea 有权
标题翻译：从尿素生产氨的过程
公开(公告)号：US20110076222A1
公开(公告)日：2011-03-31
申请号：US12963334
申请日：2010-12-08
申请人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
发明人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
IPC分类号： C01C1/08
CPC分类号： C01C1/086 , B01D2251/2062 , F01N3/208 , F01N2240/40 , F01N2610/02 , F01N2610/06 , F01N2610/10 , F01N2610/14 , F01N2900/1808 , F01N2900/1811 , F01N2900/1814 , Y02T10/24
摘要： In a process for producing ammonia from urea which process comprises: (a) heating a liquid phase reaction medium comprising an aqueous solution of urea, or a mixture of urea, containing biuret or ammonium carbamate on site, in a hydrolysis reactor such that a pressurized gaseous ammonia and carbon dioxide-containing product is obtained which is essentially free of urea, biuret, or ammonium carbamate; (b) separating the gaseous ammonia and carbon dioxide-containing product from the liquid phase reaction medium at the prevailing pressure; (c) retaining the liquid phase reaction medium in the reactor for further conversion to gaseous ammonia and carbon dioxide, and/or recycling at least a portion of the said reaction medium back into the reactor, a urea dissolver, or feed solution to the reactor for further conversion; and (d) withdrawing the gaseous ammonia and carbon dioxide-containing product separated in step (b) at a controlled rate to meet varying ammonia demand requirements; the improvement wherein the operating pressure of said reactor is set or adjusted such that excess water for the reaction is maintained in the reactor and the dew-point of said gaseous ammonia and carbon-dioxide-containing product is below the operating temperature of said reactor.
摘要翻译：在从尿素生产氨的方法中，该方法包括：（a）在水解反应器中加热含有尿素水溶液或含有缩二脲或铵氨基甲酸铵的尿素混合物的液相反应介质，使得加压得到基本上不含尿素，缩二脲或氨基甲酸铵的气态氨和二氧化碳的产物; （b）在主要压力下从液相反应介质中分离出含氨气和二氧化碳的产物; （c）将液相反应介质保留在反应器中用于进一步转化为气态氨和二氧化碳，和/或将至少一部分所述反应介质再循环回反应器，尿素溶解器或进料到反应器的溶液进一步转换和（d）以受控的速率取出在步骤（b）中分离的气态氨和二氧化碳的产品，以满足不同的氨需求要求; 改进之处在于其中设定或调整所述反应器的操作压力，使得在反应器中维持反应的过量水，并且所述气态氨和含二氧化碳的产物的露点低于所述反应器的操作温度。

3. 发明申请

US20090148370A1 Process to produce ammonia from urea 审中-公开
标题翻译：从尿素生产氨的工艺
公开(公告)号：US20090148370A1
公开(公告)日：2009-06-11
申请号：US11999952
申请日：2007-12-06
申请人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
发明人： Herbert W. Spencer, III , H. James Peters , William G. Hankins , Madoka Fujita
IPC分类号： C01C1/08 , B01D53/56
CPC分类号： C01C1/086 , B01D2251/2062 , F01N3/208 , F01N2240/40 , F01N2610/02 , F01N2610/06 , F01N2610/10 , F01N2610/14 , F01N2900/1808 , F01N2900/1811 , F01N2900/1814 , Y02T10/24
摘要： In a process for generating ammonia from urea which process comprises: (a) heating an aqueous solution of urea, or a mixture of urea, containing biuret or ammonium carbamate on site, in a hydrolysis reactor such that a gaseous ammonia-containing product is obtained which is essentially free of urea, biuret, or ammonium carbamate, the temperature and pressure being maintained by the input of heat to the reactor; (b) separating the gaseous ammonia-containing product from the liquid phase aqueous reaction media at the operating pressure; (c) retaining the liquid phase reaction medium in the reactor for further conversion to gaseous ammonia and carbon dioxide, and/or recycling at least a portion of the said reaction medium back into the reactor, a urea dissolver, or the feed solution to the reactor for further conversion; and (d) withdrawing the gaseous ammonia and carbon dioxide-containing product separated in step (b) at a controlled rate to meet demand requirements; the improvement wherein the temperature in the hydrolysis reactor is not controlled but is allowed to vary to match the demand requirement for ammonia and in which the pressure is varied as function of the demand requirement for ammonia or reactor operating temperature.
摘要翻译：在从尿素生成氨的方法中，该方法包括：（a）在水解反应器中加热尿素水溶液或含有缩二脲或铵氨基甲酸铵的尿素混合物，使得得到含气态氨的产物其基本上不含脲，缩二脲或氨基甲酸铵，温度和压力通过向反应器的热量输入而保持; （b）在操作压力下从气相含水反应介质中分离含气态氨的产物; （c）将液相反应介质保留在反应器中以进一步转化为气态氨和二氧化碳，和/或将至少一部分所述反应介质再循环回反应器，尿素溶解器或向反应器进一步转化; 和（d）以受控的速率取出在步骤（b）中分离出的含氨气和二氧化碳的产品，以满足需求; 其中水解反应器中的温度不受控制但允许变化以匹配氨的需求量并且其中压力根据对氨或反应器操作温度的需求要求而变化的改进。

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