| 摘要 |
<p>In an apparatus for synthesizing urea and a method of improving the same, it becomes possible to provide a heavy condenser at a relatively low position and, further, it becomes possible to overcome the problems caused by passing a process fluid from the condenser in a tube. Namely, an apparatus for synthesizing urea which comprises: a synthesis tube wherein NH<SUB>3</SUB> is reacted with CO<SUB>2</SUB> to give a synthesis solution containing urea, the unreacted NH<SUB>3</SUB>, the unreacted CO<SUB>2</SUB> and water; a stripper whereby the synthesis solution is stripped by using at least a portion of the starting CO<SUB>2</SUB> to thereby separate a gas containing the unreacted NH<SUB>3</SUB> and CO<SUB>2</SUB>; a vertical submerge condenser which has a shell-and-tube structure and by which the above-described gas is condensed into an absorption medium in the shell side under cooling with a cooling medium passing through the tube side; and a circulation means for circulating the liquid obtained from the condenser into the synthesis tube; wherein the condenser is located below the synthesis tube. A method of improving an apparatus for synthesizing urea having a synthesis tube which comprises providing the stripper, vertical submerge condenser and circulation means as described above and locating the condenser below the synthesis tube.</p> |
