Method of stripping unreacted materials in urea synthesis process

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4321410
SERIAL NO

06240170

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Mitsui Toatsu Chemicals, IncorporatedTOKYO10
TOYO ENGINEERING CORPORATIONKYUNGGI-DO 425-83643

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujii, Hidetsugu Mobara, JP 13 132
Fukui, Akito Inba, JP 48 607
Morikawa, Haruyuki Funabashi, JP 6 37
Ono, Hiroshi Fujisawa, JP 300 2610

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 4256662 Process for producing urea 2 1980
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
THE DOW CHEMICAL COMPANY (1)
5635077 Ammonia removal 2 1995
 
Oi Electric Co., Ltd. (1)
* 5641401 Sludge deodorization 6 1995
 
Other [Check patent profile for assignment information] (1)
* 2011/0108,421 ELECTROCHEMICAL METHODS AND PROCESSES FOR CARBON DIOXIDE RECOVERY FROM ALKALINE SOLVENTS FOR CARBON DIOXIDE CAPTURE FROM AIR 24 2010
 
CARBON SINK INC. (15)
8715393 ) from air 9 2008
8262774 English Title Not Available 5 2008
* 2009/0130,321 AIR COLLECTOR WITH FUNCTIONALIZED ION EXCHANGE MEMBRANE FOR CAPTURING AMBIENT CO2 16 2008
8999279 English Title Not Available 5 2009
* 2011/0203,174 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 26 2009
8337589 Method and apparatus for extracting carbon dioxide from air 5 2010
8273160 Method and apparatus for extracting carbon dioxide from air 7 2010
* 2011/0081,712 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 26 2010
* 2011/0079,146 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 26 2010
* 2011/0185,897 REMOVAL OF CARBON DIOXIDE FROM AIR 25 2011
9205372 English Title Not Available 2 2012
9266051 Removal of carbon dioxide from air 2 2013
9616375 Capture of carbon dioxide (CO2) from air 0 2014
9266052 Method and apparatus for extracting carbon dioxide from air 2 2014
9527747 Extraction and sequestration of carbon dioxide 0 2014
 
FARMLAND INDUSTRIES, INC. (3)
* 5385646 Method of treating chemical process effluent 5 1993
* 5643420 Method for treating process condensate 0 1995
* 5779861 Method for treating process condensate 1 1996
 
Kilimanjaro Energy, Inc. (13)
* 2010/0095,842 REMOVAL OF CARBON DIOXIDE FROM AIR 29 2007
* 2011/0206,588 METHOD AND APPARATUS FOR REMOVING AMMONIA FROM A GAS STREAM 24 2009
* 2011/0203,311 REMOVAL OF CARBON DIOXIDE FROM AIR 28 2009
* 7833328 Laminar scrubber apparatus for capturing carbon dioxide from air and methods of use 31 2009
* 2009/0320,688 Laminar Scrubber Apparatus for Capturing Carbon Dioxide From Air and Methods of Use 10 2009
* 2011/0083,554 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
* 2011/0081,709 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
* 2011/0079,144 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 29 2010
* 2011/0079,147 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
* 2011/0081,710 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 30 2010
* 2011/0033,357 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
* 2011/0033,358 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
* 2011/0027,157 METHOD AND APPARATUS FOR EXTRACTING CARBON DIOXIDE FROM AIR 28 2010
 
SNAMPROGETTI S.P.A. (2)
* 4747915 Falling-film process for the cocurrent evaporation of a solution 10 1986
* 4758311 Method for avoiding the corrosion of the strippers in the urea manufacturing plants 3 1987
 
Pilgrim's Pride Corporation (1)
6464875 Food, animal, vegetable and food preparation byproduct treatment apparatus and process 54 2000
 
HAIN FOOD GROUP, INC., THE (1)
* 5498317 Apparatus for treating chemical production plant process condensate 3 1994
* Cited By Examiner