Method of stripping unreacted materials in urea synthesis process

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United States of America Patent

PATENT NO 4321410
SERIAL NO

06240170

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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 OwnerAddress
TOYO ENGINEERING CORPORATION1-5-1 MARUNOUCHI CHIYODA-KU TOKYO 1006511
MITSUI TOATSU CHEMICALS INCORPORATED2-5 KASUMIGASEKI 3-CHOME CHIYODA-KU A CORP OF JAPAN TOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujii, Hidetsugu Mobara, JP 13 143
Fukui, Akito Inba, JP 48 688
Morikawa, Haruyuki Funabashi, JP 9 43
Ono, Hiroshi Fujisawa, JP 312 2943

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