Introduction to the urea production process using carbon dioxide stripping

Detailed introduction? Can’t explain it right away. Do you need the information? It can be sent. My email is YLLY163@163.COM

Reply to 2# Xishui: Hello, it’s about an introduction to the process flow for producing urea using the carbon dioxide stripping method; it would be even better if there were simple process flows and flowcharts available.

This post was last edited by fjhuyuyang on 2010-11-28 at 12:14. Just find a contractual technical attachment for a card-making project – it contains detailed instructions! But for confidentiality reasons, others may not be able to give it to you

This post was last edited by qiwu9981 on 2010-11-29 at 20:52. After being pressurized by an NH3 pump, NH3 is drawn in by a high-pressure ejector; it then mixes with concentrated ammonium hydroxide solution coming from the high-pressure washer and enters the high-pressure ammonium hydroxide condenser where it reacts. There, it mixes with CO2, NH3, H2O, and other gases from the vapor phase of the stripping tower to form ammonium hydroxide solution, which enters the synthesis tower. The gaseous substances that have not reacted in the ammonium hydroxide condenser pass through another pipeline into the synthesis tower to continue reacting and produce more ammonium hydroxide. Inside the synthesis tower, methylamine is primarily decomposed to produce urea. Urine and H2O enter the stripping column where they undergo stripping with the CO2 flowing in counterflow; the resulting stripping gas is then sent back to the high-pressure ammonium methoxide cooler for further reaction. The urine enters the pre-separator via LV203. Unreacted CO2, NH3, H2O, and inert gases from the synthesis tower enter the high-pressure scrubber at the top of the tower; after passing through the explosion-proof area, they reach the lower section of the scrubber. There, a high-concentration ammonium methoxide solution drawn from the low-pressure scrubber liquid level tank is used for submerged absorption, resulting in an even higher concentration of ammonium methoxide. This solution is then pumped into the ammonium methoxide condenser by means of a high-pressure injector to continue participating in the reaction. The gases that cannot be absorbed proceed to the tetraamine absorption tower via HV202, where they are absorbed again at a pressure of 0.35 Mpa using ammonia water from the desorption pump and absorbent solution from the process condensate pump. The absorbent solution then enters the atmospheric-pressure absorption tower, where it absorbs more ammonia and a small amount of CO2 from the gas streams coming from the desorption and scrubbing processes; after that, it enters the ammonia water tank. The gas stream is released through the PV205 control valve. After cyclone separation in the pre-separator, the liquid phase enters the distillation tower, where its concentration is further increased through distillation. It then enters the flash tank for vacuum flashing; after separation, it goes into the urea tank. From there, it is pumped to the first and second evaporation stages for further vacuum decomposition. After concentration, it is pressurized by a melting pump and sent to the granulation unit for packaging. The gas streams from the pre-separator and the distillation tower are mixed together and condensed in the low-pressure ammonium methoxide cooler. Absorbent solutions from the reflux pump and the process condensate pump are used for absorption; after that, the liquid phase returns to the low-pressure scrubber liquid level tank. The gas stream goes to the atmospheric-pressure absorption tower, where it is absorbed again using tetraamine solution and dilute ammonia water from the absorption tower feed pump. The liquid phase then enters the ammonia water tank, while the gas stream is released through the vent pipe. The flash gas streams, as well as those from the first and second evaporation stages, are condensed in the surface cooler; the liquid phase then enters the ammonia water tank, while the gas stream is released through the vent tube.

I don’t quite understand some of it, but thanks anyway

Agree with what was said on floor 5; the air lift method is roughly this process