发明名称 |
FREMGANGSM}TE VED FREMSTILLING AV URINSTOFF. |
摘要 |
<p>Carbon dioxide is reacted with a stoichiometric excess of ammonia at urea synthesis temperatures and pressures in a urea synthesis zone with the mol ratio of ammonia to carbon dioxide being in the range of from 5:1 to 12:1. The urea synthesis effluent from the urea synthesis zone is pressurized to a pressure higher than the urea synthesis pressure, and heated to a temperature higher than the urea synthesis temperature in a separation zone, wherein unreacted ammonium carbamate and excess ammonia contained in said urea synthesis effluent are separated from urea synthesis effluent in the form of a gaseous mixture of ammonia and carbon dioxide. The thus separated gaseous mixture of ammonia and carbon dioxide is recycled to said urea synthesis zone by means of the pressure difference.</p> |
申请公布号 |
NO763240(A) |
申请公布日期 |
1977.03.23 |
申请号 |
NO19760003240 |
申请日期 |
1976.09.21 |
申请人 |
MITSUI TOATSU CHEMICALS, INCORPORATED, |
发明人 |
ONO, HIROSHI,;INOUE, SHIGERU, |
分类号 |
C07C67/00;C07C239/00;C07C273/04;(IPC1-7):07C/ |
主分类号 |
C07C67/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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