Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1997-09-26
1999-08-10
Kumar, Shailendra
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564 68, 564 70, 564 71, 564 72, C07C27304
Patent
active
059361220
ABSTRACT:
A vertical condenser is installed on or above a urea synthesis column to condense the mixed gas from the stripper by bringing it into contact with an absorption medium under cooling. A first down pipe for making the top part of the condenser communicate with the bottom part of the synthesis column is provided to allow the resultant condensate to flow down to the bottom part of the synthesis column by gravity. The condensate is subjected to urea synthesis together with feed ammonia or a part of feed carbon dioxide supplied thereto. The urea synthesis solution thus formed is introduced into the stripper by gravity through a second down pipe having an opening in the top part of the synthesis column. Unreacted ammonia and carbon dioxide are separated as the aforesaid mixed gas by the rest of the feed carbon dioxide and introduced into the bottom part of the aforesaid condenser so as to be condensed. Alternatively, the condensate from the vertical condenser is sucked by means of an ejector using preheated feed liquid ammonia as the driving fluid, so that it is introduced into the bottom part of the urea synthesis column and is subjected to urea synthesis.
REFERENCES:
patent: 3406201 (1968-10-01), Baumann et al.
patent: 3867442 (1975-02-01), Logemann
patent: 4208347 (1980-06-01), Pagani
Fujii Hidetsugu
Kojima Yasuhiko
Kumar Shailendra
Toyo Engineering Corporation
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