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1. 发明申请

US20070013092A1 Process for preparing granular urea product 有权
标题翻译：颗粒状尿素产品的制备方法
公开(公告)号：US20070013092A1
公开(公告)日：2007-01-18
申请号：US11484167
申请日：2006-07-11
申请人： Eiji Sakata , Genshi Nishikawa , Haruyuki Morikawa
发明人： Eiji Sakata , Genshi Nishikawa , Haruyuki Morikawa
IPC分类号： B29B9/00
CPC分类号： B01J2/16 , C05C9/005 , C05G3/0058 , Y02P20/129
摘要： To effectively prepare granular urea that constantly has a moisture concentration of 0.3 wt % or less in the product and has a large grain load strength to be hardly crashed. In a granulating process for preparing granular urea from an aqueous urea solution using a fluidized bed method or a fluidized, spouted bed method, an aqueous urea solution having an urea concentration of 94-98.5 wt % is used, and an operation temperature of the fluidized bed is controlled in a range of 110-120° C. to accelerate drying of a granulated product, thereby giving a granular urea product having moisture of 0.3 wt % or less in the product.
摘要翻译：为了有效地制备在产品中不断具有0.3重量％以下的水分浓度的粒状尿素，并且具有很大的颗粒负荷强度，几乎不会崩溃。在使用流化床法或流化喷射床法从尿素水溶液制备颗粒状尿素的造粒方法中，使用尿素浓度为94-98.5重量％的尿素水溶液，并且流化床床控制在110-120℃的范围内，以加速造粒产物的干燥，从而得到产品中水分为0.3重量％以下的颗粒状尿素产品。

2. 发明授权

US07153693B2 Method and apparatus for determining urea concentration 有权
公开(公告)号：US07153693B2
公开(公告)日：2006-12-26
申请号：US10369695
申请日：2003-02-21
申请人： Yoshihiro Tajiri , Takuya Hayabuchi , Naohiro Teramoto , Yasuhiko Kojima , Eiji Sakata , Haruyuki Morikawa
发明人： Yoshihiro Tajiri , Takuya Hayabuchi , Naohiro Teramoto , Yasuhiko Kojima , Eiji Sakata , Haruyuki Morikawa
IPC分类号： G01N33/00 , G01N27/08 , G01N27/10
CPC分类号： G01N31/002 , G01N27/021 , Y10T436/117497 , Y10T436/171538 , Y10T436/175383
摘要： A method for determining a urea concentration in an aqueous solution containing urea, includes: hydrolyzing the urea in the aqueous solution, measuring an electric conductivity χ of the aqueous solution, and determining the urea concentration in the aqueous solution from the electric conductivity χ using a correlation between the urea concentration and an electric conductivity.

3. 发明授权

US5965071A Process for preparing granular urea 失效
标题翻译：颗粒状尿素的制备方法
公开(公告)号：US5965071A
公开(公告)日：1999-10-12
申请号：US913871
申请日：1997-09-05
申请人： Hidetsugu Fujii , Haruyuki Morikawa
发明人： Hidetsugu Fujii , Haruyuki Morikawa
IPC分类号： B01J2/02 , B01J2/04 , B01J2/16 , C05C9/00 , C05C9/02 , C07C273/02 , C07C273/14 , C07C275/00 , B29B9/10
CPC分类号： B01J2/16 , B01J2/04 , C05C9/005 , C07C273/02 , C07C273/14
摘要： The present invention provides a process for preparing granular urea, which solves the problem of removing moisture in a prilling tower method and the problem of concentrating diluted formaldehyde in granulation by a fluidized, spouted bed method when urea is granulated in the presence of formaldehyde. That is, the present invention provides a process for preparing granular urea from liquid drops or sprayed drops of a urea solution, wherein the urea solution is divided into two portions of a urea solution A and a urea solution B, and a urea solution prepared by mixing an aqueous formaldehyde solution with the urea solution A, concentrating the above mixed solution and then mixing it with the urea solution B is used.
摘要翻译： PCT No.PCT / JP97 / 00108 Sec。 371日期：1997年9月5日 102（e）1997年9月5日PCT 1997年1月21日PCT PCT。公开号WO97 / 28100 PCT 日期：1997年8月7日本发明提供了一种制备颗粒状尿素的方法，其解决了造粒塔法中除去水分的问题，以及当尿素成粒时，通过流化喷雾床方法将稀释的甲醛浓缩成粒状的问题存在甲醛。也就是说，本发明提供了一种从尿液溶液的液滴或喷雾液滴制备颗粒状尿素的方法，其中将尿素溶液分成尿素溶液A和尿素溶液B两部分，尿素溶液由将甲醛水溶液与尿素溶液A混合，浓缩上述混合溶液，然后与尿素溶液B混合。

4. 发明授权

US07582237B2 Process for preparing granular urea product 有权
标题翻译：颗粒状尿素产品的制备方法
公开(公告)号：US07582237B2
公开(公告)日：2009-09-01
申请号：US11484167
申请日：2006-07-11
申请人： Eiji Sakata , Genshi Nishikawa , Haruyuki Morikawa
发明人： Eiji Sakata , Genshi Nishikawa , Haruyuki Morikawa
IPC分类号： C05C9/00 , B29B9/00
CPC分类号： B01J2/16 , C05C9/005 , C05G3/0058 , Y02P20/129
摘要： In a granulating process for preparing granular urea from an aqueous urea solution using a fluidized bed method or a fluidized, spouted bed method, an aqueous urea solution having a urea concentration of 94-98.5 wt % is used and the operational temperature of the fluidized bed is controlled in a range of 110-120° C. to accelerate the drying of a granulated product to thereby give a granular urea product having a moisture content of 0.3 wt % or less.
摘要翻译：在使用流化床法或流化喷雾床法从尿素水溶液制备颗粒状尿素的造粒方法中，使用尿素浓度为94-98.5重量％的尿素水溶液，流化床的操作温度控制在110-120℃的范围内以加速造粒产物的干燥，从而得到水分含量为0.3重量％以下的颗粒状尿素产品。

5. 发明授权

US4504679A Process for synthesizing urea 失效
标题翻译：尿素合成方法
公开(公告)号：US4504679A
公开(公告)日：1985-03-12
申请号：US430557
申请日：1982-09-30
申请人： Shigeru Inoue , Hiroshi Ono , Akito Fukui , Hidetsugu Fujii , Haruyuki Morikawa , Suguru Watanabe
发明人： Shigeru Inoue , Hiroshi Ono , Akito Fukui , Hidetsugu Fujii , Haruyuki Morikawa , Suguru Watanabe
IPC分类号： C07C67/00 , C07C239/00 , C07C273/04 , C07C126/02
CPC分类号： C07C273/04
摘要： Disclosed herein is a process of synthesizing urea including reacting ammonia and carbon dioxide at a urea synthesis pressure and temperature in a urea synthesis zone, separating excess ammonia and unreacted ammonium carbamate from the thus-obtained urea synthesis melt as a gaseous mixture containing ammonia and carbon dioxide, recirculating the gaseous mixture to the urea synthesis zone, and, on the other hand, obtaining urea from an aqueous urea solution which has been obtained by separating the excess ammonia and unreacted ammonium carbamate. The above process features ingeniously combined conditions of various process steps. It produces urea using less high-pressure steam and recovers less low-pressure steam. A stripping operation making use of carbon dioxide can be effectively incorporated in the above process. The above process permits to cut the construction cost of a urea synthesis plant.
摘要翻译：本文公开了一种合成尿素的方法，其包括在尿素合成区中的尿素合成压力和温度下使氨和二氧化碳反应，将由此得到的尿素合成熔体中的过量氨和未反应的氨基甲酸铵与含有氨和碳的气体混合物分离二氧化物，将气体混合物再循环到尿素合成区，另一方面，从通过分离过量的氨和未反应的氨基甲酸铵获得的尿素水溶液获得尿素。上述过程巧妙地结合了各种工艺步骤的组合条件。它使用更少的高压蒸汽产生尿素，并回收较少的低压蒸汽。在上述过程中可以有效地并入使用二氧化碳的剥离操作。上述过程允许减少尿素合成设备的建造成本。

6. 发明授权

US4321410A Method of stripping unreacted materials in urea synthesis process 失效
标题翻译：在尿素合成过程中汽提未反应物质的方法
公开(公告)号：US4321410A
公开(公告)日：1982-03-23
申请号：US240170
申请日：1981-03-03
申请人： Hiroshi Ono , Hidetsugu Fujii , Haruyuki Morikawa , Akito Fukui
发明人： Hiroshi Ono , Hidetsugu Fujii , Haruyuki Morikawa , Akito Fukui
IPC分类号： C07C273/16 , C07C67/00 , C07C239/00 , C07C273/04 , C07C126/02
CPC分类号： C07C273/04
摘要： In a process in which a urea synthesis effluent obtained by reacting ammonia with carbon dioxide is subjected to a stripping step of bringing the urea synthesis effluent into countercurrent contact with carbon dioxide under heating to obtain an aqueous urea solution containing a small amount of ammonia and ammonium carbamate, the improvement comprises first bringing the urea synthesis effluent is into contact with a separated gas evolved in the stripping step under adiabatic conditions or with a little cooling. The use of the above process enables a reduction in size of the stripper and a recovery of the high pressure steam without keeping the ammonia to carbon dioxide molar ratio lower than that of the conventional method.
摘要翻译：在将氨与二氧化碳反应得到的尿素合成流出物进行汽提的过程中，使得尿素合成流出物与二氧化碳在加热下逆流接触，得到含有少量氨和铵的尿素水溶液氨基甲酸酯的改进包括首先使尿素合成流出物在绝热条件下或少许冷却下与汽提步骤中分离的气体接触。使用上述方法可以减少汽提器的尺寸和高压蒸汽的回收，而不使氨与二氧化碳的摩尔比低于常规方法。

7. 发明授权

US4311856A Process for synthesizing urea 失效
标题翻译：尿素合成方法
公开(公告)号：US4311856A
公开(公告)日：1982-01-19
申请号：US221816
申请日：1980-12-31
申请人： Shigeru Inoue , Hiroshi Ono , Akito Fukui , Haruyuki Morikawa
发明人： Shigeru Inoue , Hiroshi Ono , Akito Fukui , Haruyuki Morikawa
IPC分类号： C07C273/04 , C07C126/02
CPC分类号： C07C273/04
摘要： An inert gas containing carbon dioxide and ammonia and separated from a urea synthesis effluent under urea synthesis pressures is brought into contact with an absorbent along with unreacted carbon dioxide and ammonia separated in high pressure distillation at a pressure of from 10 to 25 kg/cm.sup.2 G to absorb substantially all of the carbon dioxide and the major portion of the ammonia, and is cooled to be separated from the resulting liquid ammonia and then is discharged. The inert gas can be treated with little or no danger of explosion by the above method.
摘要翻译：在尿素合成压力下将含有二氧化碳和氨并与尿素合成流出物分离的惰性气体与未反应的二氧化碳和氨在高压蒸馏中以10至25kg / cm2的压力分离而与吸收剂接触以吸收基本上所有的二氧化碳和氨的主要部分，并且被冷却以与所得液氨分离，然后排出。通过上述方法可以很少或没有爆炸危险来处理惰性气体。

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