发明名称 |
TREATMENT OF WATER VAPOR GENERATED IN CONCENTRATING AN AQUEOUS UREA SOLUTION |
摘要 |
<p>Water vapor generated in concentrating an aqueous urea solution and containing a small amount of aqueous urea solution mist, ammonia and carbon dioxide is treated to recover urea and ammonia values. The water vapor is introduced into a separator wherein all of the urea solution mist is separated together with a part of the ammonia and the carbon dioxide to form a first condensate. The water vapor is then fed into a surface cooler wherein the water vapor is indirectly cooled to form a second condensate. The first condensate is used for process water and the second condensate is subjected into rectification to separate ammonia and carbon dioxide contained therein in the form of a mixed gas, which is recovered, from the remaining waste water free of ammonia and carbon dioxide.</p> |
申请公布号 |
CA1044257(A) |
申请公布日期 |
1978.12.12 |
申请号 |
CA19750226826 |
申请日期 |
1975.05.13 |
申请人 |
MITSUI TOATSU CHEMICALS, INCORPORATED |
发明人 |
CHIKAOKA, SADASHI;KAWABE, TOYOTARO;MIYAKAWA, HISASHI;SEKI, NAOTOSHI |
分类号 |
B01J19/00;B01J2/00;C07C67/00;C07C239/00;C07C273/04;C07C273/16;(IPC1-7):07C126/08 |
主分类号 |
B01J19/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|